974 lines
27 KiB
C
974 lines
27 KiB
C
/*-
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* Copyright (c) 1994-1996 Søren Schmidt
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/* XXX we use functions that might not exist. */
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#include "opt_compat.h"
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#ifndef COMPAT_43
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#error "Unable to compile Linux-emulator due to missing COMPAT_43 option!"
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/imgact.h>
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#include <sys/imgact_aout.h>
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#include <sys/imgact_elf.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/signalvar.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysent.h>
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#include <sys/sysproto.h>
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#include <sys/user.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_page.h>
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#include <vm/vm_extern.h>
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#include <sys/exec.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <machine/cpu.h>
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#include <machine/md_var.h>
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#include <sys/mutex.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_object.h>
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#include <i386/linux/linux.h>
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#include <i386/linux/linux_proto.h>
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#include <compat/linux/linux_mib.h>
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#include <compat/linux/linux_signal.h>
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#include <compat/linux/linux_util.h>
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MODULE_VERSION(linux, 1);
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MODULE_DEPEND(linux, sysvmsg, 1, 1, 1);
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MODULE_DEPEND(linux, sysvsem, 1, 1, 1);
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MODULE_DEPEND(linux, sysvshm, 1, 1, 1);
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MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures");
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#if BYTE_ORDER == LITTLE_ENDIAN
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#define SHELLMAGIC 0x2123 /* #! */
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#else
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#define SHELLMAGIC 0x2321
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#endif
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/*
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* Allow the sendsig functions to use the ldebug() facility
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* even though they are not syscalls themselves. Map them
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* to syscall 0. This is slightly less bogus than using
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* ldebug(sigreturn).
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*/
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#define LINUX_SYS_linux_rt_sendsig 0
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#define LINUX_SYS_linux_sendsig 0
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extern char linux_sigcode[];
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extern int linux_szsigcode;
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extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
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SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
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static int linux_fixup(register_t **stack_base,
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struct image_params *iparams);
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static int elf_linux_fixup(register_t **stack_base,
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struct image_params *iparams);
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static void linux_prepsyscall(struct trapframe *tf, int *args, u_int *code,
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caddr_t *params);
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static void linux_sendsig(sig_t catcher, int sig, sigset_t *mask,
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u_long code);
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static void exec_linux_setregs(struct thread *td, u_long entry,
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u_long stack, u_long ps_strings);
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/*
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* Linux syscalls return negative errno's, we do positive and map them
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*/
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static int bsd_to_linux_errno[ELAST + 1] = {
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-0, -1, -2, -3, -4, -5, -6, -7, -8, -9,
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-10, -35, -12, -13, -14, -15, -16, -17, -18, -19,
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-20, -21, -22, -23, -24, -25, -26, -27, -28, -29,
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-30, -31, -32, -33, -34, -11,-115,-114, -88, -89,
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-90, -91, -92, -93, -94, -95, -96, -97, -98, -99,
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-100,-101,-102,-103,-104,-105,-106,-107,-108,-109,
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-110,-111, -40, -36,-112,-113, -39, -11, -87,-122,
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-116, -66, -6, -6, -6, -6, -6, -37, -38, -9,
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-6, -6, -43, -42, -75, -6, -84
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};
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int bsd_to_linux_signal[LINUX_SIGTBLSZ] = {
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LINUX_SIGHUP, LINUX_SIGINT, LINUX_SIGQUIT, LINUX_SIGILL,
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LINUX_SIGTRAP, LINUX_SIGABRT, 0, LINUX_SIGFPE,
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LINUX_SIGKILL, LINUX_SIGBUS, LINUX_SIGSEGV, LINUX_SIGSYS,
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LINUX_SIGPIPE, LINUX_SIGALRM, LINUX_SIGTERM, LINUX_SIGURG,
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LINUX_SIGSTOP, LINUX_SIGTSTP, LINUX_SIGCONT, LINUX_SIGCHLD,
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LINUX_SIGTTIN, LINUX_SIGTTOU, LINUX_SIGIO, LINUX_SIGXCPU,
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LINUX_SIGXFSZ, LINUX_SIGVTALRM, LINUX_SIGPROF, LINUX_SIGWINCH,
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0, LINUX_SIGUSR1, LINUX_SIGUSR2
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};
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int linux_to_bsd_signal[LINUX_SIGTBLSZ] = {
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SIGHUP, SIGINT, SIGQUIT, SIGILL,
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SIGTRAP, SIGABRT, SIGBUS, SIGFPE,
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SIGKILL, SIGUSR1, SIGSEGV, SIGUSR2,
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SIGPIPE, SIGALRM, SIGTERM, SIGBUS,
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SIGCHLD, SIGCONT, SIGSTOP, SIGTSTP,
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SIGTTIN, SIGTTOU, SIGURG, SIGXCPU,
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SIGXFSZ, SIGVTALRM, SIGPROF, SIGWINCH,
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SIGIO, SIGURG, SIGSYS
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};
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#define LINUX_T_UNKNOWN 255
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static int _bsd_to_linux_trapcode[] = {
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LINUX_T_UNKNOWN, /* 0 */
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6, /* 1 T_PRIVINFLT */
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LINUX_T_UNKNOWN, /* 2 */
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3, /* 3 T_BPTFLT */
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LINUX_T_UNKNOWN, /* 4 */
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LINUX_T_UNKNOWN, /* 5 */
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16, /* 6 T_ARITHTRAP */
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254, /* 7 T_ASTFLT */
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LINUX_T_UNKNOWN, /* 8 */
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13, /* 9 T_PROTFLT */
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1, /* 10 T_TRCTRAP */
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LINUX_T_UNKNOWN, /* 11 */
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14, /* 12 T_PAGEFLT */
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LINUX_T_UNKNOWN, /* 13 */
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17, /* 14 T_ALIGNFLT */
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LINUX_T_UNKNOWN, /* 15 */
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LINUX_T_UNKNOWN, /* 16 */
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LINUX_T_UNKNOWN, /* 17 */
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0, /* 18 T_DIVIDE */
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2, /* 19 T_NMI */
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4, /* 20 T_OFLOW */
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5, /* 21 T_BOUND */
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7, /* 22 T_DNA */
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8, /* 23 T_DOUBLEFLT */
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9, /* 24 T_FPOPFLT */
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10, /* 25 T_TSSFLT */
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11, /* 26 T_SEGNPFLT */
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12, /* 27 T_STKFLT */
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18, /* 28 T_MCHK */
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19, /* 29 T_XMMFLT */
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15 /* 30 T_RESERVED */
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};
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#define bsd_to_linux_trapcode(code) \
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((code)<sizeof(_bsd_to_linux_trapcode)/sizeof(*_bsd_to_linux_trapcode)? \
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_bsd_to_linux_trapcode[(code)]: \
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LINUX_T_UNKNOWN)
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/*
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* If FreeBSD & Linux have a difference of opinion about what a trap
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* means, deal with it here.
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*
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* MPSAFE
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*/
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static int
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translate_traps(int signal, int trap_code)
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{
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if (signal != SIGBUS)
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return signal;
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switch (trap_code) {
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case T_PROTFLT:
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case T_TSSFLT:
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case T_DOUBLEFLT:
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case T_PAGEFLT:
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return SIGSEGV;
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default:
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return signal;
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}
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}
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static int
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linux_fixup(register_t **stack_base, struct image_params *imgp)
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{
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register_t *argv, *envp;
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argv = *stack_base;
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envp = *stack_base + (imgp->argc + 1);
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(*stack_base)--;
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**stack_base = (intptr_t)(void *)envp;
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(*stack_base)--;
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**stack_base = (intptr_t)(void *)argv;
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(*stack_base)--;
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**stack_base = imgp->argc;
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return 0;
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}
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static int
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elf_linux_fixup(register_t **stack_base, struct image_params *imgp)
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{
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Elf32_Auxargs *args;
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register_t *pos;
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KASSERT(curthread->td_proc == imgp->proc &&
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(curthread->td_proc->p_flag & P_SA) == 0,
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("unsafe elf_linux_fixup(), should be curproc"));
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args = (Elf32_Auxargs *)imgp->auxargs;
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pos = *stack_base + (imgp->argc + imgp->envc + 2);
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if (args->trace)
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AUXARGS_ENTRY(pos, AT_DEBUG, 1);
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if (args->execfd != -1)
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AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
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AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
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AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
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AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
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AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
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AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
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AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
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AUXARGS_ENTRY(pos, AT_BASE, args->base);
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AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
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AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
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AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
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AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
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AUXARGS_ENTRY(pos, AT_NULL, 0);
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free(imgp->auxargs, M_TEMP);
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imgp->auxargs = NULL;
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(*stack_base)--;
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**stack_base = (register_t)imgp->argc;
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return 0;
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}
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extern int _ucodesel, _udatasel;
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extern unsigned long linux_sznonrtsigcode;
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static void
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linux_rt_sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
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{
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struct thread *td = curthread;
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struct proc *p = td->td_proc;
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struct sigacts *psp;
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struct trapframe *regs;
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struct l_rt_sigframe *fp, frame;
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int oonstack;
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PROC_LOCK_ASSERT(p, MA_OWNED);
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psp = p->p_sigacts;
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mtx_assert(&psp->ps_mtx, MA_OWNED);
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regs = td->td_frame;
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oonstack = sigonstack(regs->tf_esp);
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#ifdef DEBUG
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if (ldebug(rt_sendsig))
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printf(ARGS(rt_sendsig, "%p, %d, %p, %lu"),
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catcher, sig, (void*)mask, code);
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#endif
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/*
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* Allocate space for the signal handler context.
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*/
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if ((p->p_flag & P_ALTSTACK) && !oonstack &&
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SIGISMEMBER(psp->ps_sigonstack, sig)) {
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fp = (struct l_rt_sigframe *)(p->p_sigstk.ss_sp +
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p->p_sigstk.ss_size - sizeof(struct l_rt_sigframe));
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} else
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fp = (struct l_rt_sigframe *)regs->tf_esp - 1;
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mtx_unlock(&psp->ps_mtx);
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/*
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* Build the argument list for the signal handler.
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*/
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if (p->p_sysent->sv_sigtbl)
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if (sig <= p->p_sysent->sv_sigsize)
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sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
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bzero(&frame, sizeof(frame));
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frame.sf_handler = catcher;
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frame.sf_sig = sig;
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frame.sf_siginfo = &fp->sf_si;
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frame.sf_ucontext = &fp->sf_sc;
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/* Fill in POSIX parts */
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frame.sf_si.lsi_signo = sig;
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frame.sf_si.lsi_code = code;
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frame.sf_si.lsi_addr = (void *)regs->tf_err;
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/*
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* Build the signal context to be used by sigreturn.
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*/
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frame.sf_sc.uc_flags = 0; /* XXX ??? */
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frame.sf_sc.uc_link = NULL; /* XXX ??? */
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frame.sf_sc.uc_stack.ss_sp = p->p_sigstk.ss_sp;
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frame.sf_sc.uc_stack.ss_size = p->p_sigstk.ss_size;
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frame.sf_sc.uc_stack.ss_flags = (p->p_flag & P_ALTSTACK)
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? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
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PROC_UNLOCK(p);
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bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask);
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frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__bits[0];
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frame.sf_sc.uc_mcontext.sc_gs = rgs();
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frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs;
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frame.sf_sc.uc_mcontext.sc_es = regs->tf_es;
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frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds;
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frame.sf_sc.uc_mcontext.sc_edi = regs->tf_edi;
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frame.sf_sc.uc_mcontext.sc_esi = regs->tf_esi;
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frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_ebp;
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frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_ebx;
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frame.sf_sc.uc_mcontext.sc_edx = regs->tf_edx;
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frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_ecx;
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frame.sf_sc.uc_mcontext.sc_eax = regs->tf_eax;
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frame.sf_sc.uc_mcontext.sc_eip = regs->tf_eip;
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frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs;
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frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags;
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frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp;
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frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss;
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frame.sf_sc.uc_mcontext.sc_err = regs->tf_err;
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frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
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#ifdef DEBUG
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if (ldebug(rt_sendsig))
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printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"),
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frame.sf_sc.uc_stack.ss_flags, p->p_sigstk.ss_sp,
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p->p_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask);
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#endif
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if (copyout(&frame, fp, sizeof(frame)) != 0) {
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/*
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* Process has trashed its stack; give it an illegal
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* instruction to halt it in its tracks.
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*/
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#ifdef DEBUG
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if (ldebug(rt_sendsig))
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printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"),
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fp, oonstack);
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#endif
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PROC_LOCK(p);
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sigexit(td, SIGILL);
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}
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/*
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* Build context to run handler in.
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*/
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regs->tf_esp = (int)fp;
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regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode) +
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linux_sznonrtsigcode;
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regs->tf_eflags &= ~(PSL_T | PSL_VM);
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regs->tf_cs = _ucodesel;
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regs->tf_ds = _udatasel;
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regs->tf_es = _udatasel;
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regs->tf_fs = _udatasel;
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regs->tf_ss = _udatasel;
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PROC_LOCK(p);
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mtx_lock(&psp->ps_mtx);
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}
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|
|
|
|
|
/*
|
|
* Send an interrupt to process.
|
|
*
|
|
* Stack is set up to allow sigcode stored
|
|
* in u. to call routine, followed by kcall
|
|
* to sigreturn routine below. After sigreturn
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|
* resets the signal mask, the stack, and the
|
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* frame pointer, it returns to the user
|
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* specified pc, psl.
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*/
|
|
static void
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linux_sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
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{
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struct thread *td = curthread;
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struct proc *p = td->td_proc;
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struct sigacts *psp;
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struct trapframe *regs;
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struct l_sigframe *fp, frame;
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l_sigset_t lmask;
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int oonstack, i;
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PROC_LOCK_ASSERT(p, MA_OWNED);
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psp = p->p_sigacts;
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mtx_assert(&psp->ps_mtx, MA_OWNED);
|
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if (SIGISMEMBER(psp->ps_siginfo, sig)) {
|
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/* Signal handler installed with SA_SIGINFO. */
|
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linux_rt_sendsig(catcher, sig, mask, code);
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return;
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}
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|
|
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regs = td->td_frame;
|
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oonstack = sigonstack(regs->tf_esp);
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|
|
|
#ifdef DEBUG
|
|
if (ldebug(sendsig))
|
|
printf(ARGS(sendsig, "%p, %d, %p, %lu"),
|
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catcher, sig, (void*)mask, code);
|
|
#endif
|
|
|
|
/*
|
|
* Allocate space for the signal handler context.
|
|
*/
|
|
if ((p->p_flag & P_ALTSTACK) && !oonstack &&
|
|
SIGISMEMBER(psp->ps_sigonstack, sig)) {
|
|
fp = (struct l_sigframe *)(p->p_sigstk.ss_sp +
|
|
p->p_sigstk.ss_size - sizeof(struct l_sigframe));
|
|
} else
|
|
fp = (struct l_sigframe *)regs->tf_esp - 1;
|
|
mtx_unlock(&psp->ps_mtx);
|
|
PROC_UNLOCK(p);
|
|
|
|
/*
|
|
* Build the argument list for the signal handler.
|
|
*/
|
|
if (p->p_sysent->sv_sigtbl)
|
|
if (sig <= p->p_sysent->sv_sigsize)
|
|
sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
|
|
|
|
bzero(&frame, sizeof(frame));
|
|
|
|
frame.sf_handler = catcher;
|
|
frame.sf_sig = sig;
|
|
|
|
bsd_to_linux_sigset(mask, &lmask);
|
|
|
|
/*
|
|
* Build the signal context to be used by sigreturn.
|
|
*/
|
|
frame.sf_sc.sc_mask = lmask.__bits[0];
|
|
frame.sf_sc.sc_gs = rgs();
|
|
frame.sf_sc.sc_fs = regs->tf_fs;
|
|
frame.sf_sc.sc_es = regs->tf_es;
|
|
frame.sf_sc.sc_ds = regs->tf_ds;
|
|
frame.sf_sc.sc_edi = regs->tf_edi;
|
|
frame.sf_sc.sc_esi = regs->tf_esi;
|
|
frame.sf_sc.sc_ebp = regs->tf_ebp;
|
|
frame.sf_sc.sc_ebx = regs->tf_ebx;
|
|
frame.sf_sc.sc_edx = regs->tf_edx;
|
|
frame.sf_sc.sc_ecx = regs->tf_ecx;
|
|
frame.sf_sc.sc_eax = regs->tf_eax;
|
|
frame.sf_sc.sc_eip = regs->tf_eip;
|
|
frame.sf_sc.sc_cs = regs->tf_cs;
|
|
frame.sf_sc.sc_eflags = regs->tf_eflags;
|
|
frame.sf_sc.sc_esp_at_signal = regs->tf_esp;
|
|
frame.sf_sc.sc_ss = regs->tf_ss;
|
|
frame.sf_sc.sc_err = regs->tf_err;
|
|
frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code);
|
|
|
|
for (i = 0; i < (LINUX_NSIG_WORDS-1); i++)
|
|
frame.sf_extramask[i] = lmask.__bits[i+1];
|
|
|
|
if (copyout(&frame, fp, sizeof(frame)) != 0) {
|
|
/*
|
|
* Process has trashed its stack; give it an illegal
|
|
* instruction to halt it in its tracks.
|
|
*/
|
|
PROC_LOCK(p);
|
|
sigexit(td, SIGILL);
|
|
}
|
|
|
|
/*
|
|
* Build context to run handler in.
|
|
*/
|
|
regs->tf_esp = (int)fp;
|
|
regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
|
|
regs->tf_eflags &= ~(PSL_T | PSL_VM);
|
|
regs->tf_cs = _ucodesel;
|
|
regs->tf_ds = _udatasel;
|
|
regs->tf_es = _udatasel;
|
|
regs->tf_fs = _udatasel;
|
|
regs->tf_ss = _udatasel;
|
|
PROC_LOCK(p);
|
|
mtx_lock(&psp->ps_mtx);
|
|
}
|
|
|
|
/*
|
|
* System call to cleanup state after a signal
|
|
* has been taken. Reset signal mask and
|
|
* stack state from context left by sendsig (above).
|
|
* Return to previous pc and psl as specified by
|
|
* context left by sendsig. Check carefully to
|
|
* make sure that the user has not modified the
|
|
* psl to gain improper privileges or to cause
|
|
* a machine fault.
|
|
*/
|
|
int
|
|
linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args)
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
struct l_sigframe frame;
|
|
struct trapframe *regs;
|
|
l_sigset_t lmask;
|
|
int eflags, i;
|
|
|
|
regs = td->td_frame;
|
|
|
|
#ifdef DEBUG
|
|
if (ldebug(sigreturn))
|
|
printf(ARGS(sigreturn, "%p"), (void *)args->sfp);
|
|
#endif
|
|
/*
|
|
* The trampoline code hands us the sigframe.
|
|
* It is unsafe to keep track of it ourselves, in the event that a
|
|
* program jumps out of a signal handler.
|
|
*/
|
|
if (copyin(args->sfp, &frame, sizeof(frame)) != 0)
|
|
return (EFAULT);
|
|
|
|
/*
|
|
* Check for security violations.
|
|
*/
|
|
#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
|
|
eflags = frame.sf_sc.sc_eflags;
|
|
/*
|
|
* XXX do allow users to change the privileged flag PSL_RF. The
|
|
* cpu sets PSL_RF in tf_eflags for faults. Debuggers should
|
|
* sometimes set it there too. tf_eflags is kept in the signal
|
|
* context during signal handling and there is no other place
|
|
* to remember it, so the PSL_RF bit may be corrupted by the
|
|
* signal handler without us knowing. Corruption of the PSL_RF
|
|
* bit at worst causes one more or one less debugger trap, so
|
|
* allowing it is fairly harmless.
|
|
*/
|
|
if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF))
|
|
return(EINVAL);
|
|
|
|
/*
|
|
* Don't allow users to load a valid privileged %cs. Let the
|
|
* hardware check for invalid selectors, excess privilege in
|
|
* other selectors, invalid %eip's and invalid %esp's.
|
|
*/
|
|
#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
|
|
if (!CS_SECURE(frame.sf_sc.sc_cs)) {
|
|
trapsignal(td, SIGBUS, T_PROTFLT);
|
|
return(EINVAL);
|
|
}
|
|
|
|
lmask.__bits[0] = frame.sf_sc.sc_mask;
|
|
for (i = 0; i < (LINUX_NSIG_WORDS-1); i++)
|
|
lmask.__bits[i+1] = frame.sf_extramask[i];
|
|
PROC_LOCK(p);
|
|
linux_to_bsd_sigset(&lmask, &td->td_sigmask);
|
|
SIG_CANTMASK(td->td_sigmask);
|
|
signotify(td);
|
|
PROC_UNLOCK(p);
|
|
|
|
/*
|
|
* Restore signal context.
|
|
*/
|
|
/* %gs was restored by the trampoline. */
|
|
regs->tf_fs = frame.sf_sc.sc_fs;
|
|
regs->tf_es = frame.sf_sc.sc_es;
|
|
regs->tf_ds = frame.sf_sc.sc_ds;
|
|
regs->tf_edi = frame.sf_sc.sc_edi;
|
|
regs->tf_esi = frame.sf_sc.sc_esi;
|
|
regs->tf_ebp = frame.sf_sc.sc_ebp;
|
|
regs->tf_ebx = frame.sf_sc.sc_ebx;
|
|
regs->tf_edx = frame.sf_sc.sc_edx;
|
|
regs->tf_ecx = frame.sf_sc.sc_ecx;
|
|
regs->tf_eax = frame.sf_sc.sc_eax;
|
|
regs->tf_eip = frame.sf_sc.sc_eip;
|
|
regs->tf_cs = frame.sf_sc.sc_cs;
|
|
regs->tf_eflags = eflags;
|
|
regs->tf_esp = frame.sf_sc.sc_esp_at_signal;
|
|
regs->tf_ss = frame.sf_sc.sc_ss;
|
|
|
|
return (EJUSTRETURN);
|
|
}
|
|
|
|
/*
|
|
* System call to cleanup state after a signal
|
|
* has been taken. Reset signal mask and
|
|
* stack state from context left by rt_sendsig (above).
|
|
* Return to previous pc and psl as specified by
|
|
* context left by sendsig. Check carefully to
|
|
* make sure that the user has not modified the
|
|
* psl to gain improper privileges or to cause
|
|
* a machine fault.
|
|
*/
|
|
int
|
|
linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
struct l_ucontext uc;
|
|
struct l_sigcontext *context;
|
|
l_stack_t *lss;
|
|
stack_t ss;
|
|
struct trapframe *regs;
|
|
int eflags;
|
|
|
|
regs = td->td_frame;
|
|
|
|
#ifdef DEBUG
|
|
if (ldebug(rt_sigreturn))
|
|
printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp);
|
|
#endif
|
|
/*
|
|
* The trampoline code hands us the ucontext.
|
|
* It is unsafe to keep track of it ourselves, in the event that a
|
|
* program jumps out of a signal handler.
|
|
*/
|
|
if (copyin(args->ucp, &uc, sizeof(uc)) != 0)
|
|
return (EFAULT);
|
|
|
|
context = &uc.uc_mcontext;
|
|
|
|
/*
|
|
* Check for security violations.
|
|
*/
|
|
#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
|
|
eflags = context->sc_eflags;
|
|
/*
|
|
* XXX do allow users to change the privileged flag PSL_RF. The
|
|
* cpu sets PSL_RF in tf_eflags for faults. Debuggers should
|
|
* sometimes set it there too. tf_eflags is kept in the signal
|
|
* context during signal handling and there is no other place
|
|
* to remember it, so the PSL_RF bit may be corrupted by the
|
|
* signal handler without us knowing. Corruption of the PSL_RF
|
|
* bit at worst causes one more or one less debugger trap, so
|
|
* allowing it is fairly harmless.
|
|
*/
|
|
if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF))
|
|
return(EINVAL);
|
|
|
|
/*
|
|
* Don't allow users to load a valid privileged %cs. Let the
|
|
* hardware check for invalid selectors, excess privilege in
|
|
* other selectors, invalid %eip's and invalid %esp's.
|
|
*/
|
|
#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
|
|
if (!CS_SECURE(context->sc_cs)) {
|
|
trapsignal(td, SIGBUS, T_PROTFLT);
|
|
return(EINVAL);
|
|
}
|
|
|
|
PROC_LOCK(p);
|
|
linux_to_bsd_sigset(&uc.uc_sigmask, &td->td_sigmask);
|
|
SIG_CANTMASK(td->td_sigmask);
|
|
signotify(td);
|
|
PROC_UNLOCK(p);
|
|
|
|
/*
|
|
* Restore signal context
|
|
*/
|
|
/* %gs was restored by the trampoline. */
|
|
regs->tf_fs = context->sc_fs;
|
|
regs->tf_es = context->sc_es;
|
|
regs->tf_ds = context->sc_ds;
|
|
regs->tf_edi = context->sc_edi;
|
|
regs->tf_esi = context->sc_esi;
|
|
regs->tf_ebp = context->sc_ebp;
|
|
regs->tf_ebx = context->sc_ebx;
|
|
regs->tf_edx = context->sc_edx;
|
|
regs->tf_ecx = context->sc_ecx;
|
|
regs->tf_eax = context->sc_eax;
|
|
regs->tf_eip = context->sc_eip;
|
|
regs->tf_cs = context->sc_cs;
|
|
regs->tf_eflags = eflags;
|
|
regs->tf_esp = context->sc_esp_at_signal;
|
|
regs->tf_ss = context->sc_ss;
|
|
|
|
/*
|
|
* call sigaltstack & ignore results..
|
|
*/
|
|
lss = &uc.uc_stack;
|
|
ss.ss_sp = lss->ss_sp;
|
|
ss.ss_size = lss->ss_size;
|
|
ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags);
|
|
|
|
#ifdef DEBUG
|
|
if (ldebug(rt_sigreturn))
|
|
printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"),
|
|
ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask);
|
|
#endif
|
|
(void)kern_sigaltstack(td, &ss, NULL);
|
|
|
|
return (EJUSTRETURN);
|
|
}
|
|
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
static void
|
|
linux_prepsyscall(struct trapframe *tf, int *args, u_int *code, caddr_t *params)
|
|
{
|
|
args[0] = tf->tf_ebx;
|
|
args[1] = tf->tf_ecx;
|
|
args[2] = tf->tf_edx;
|
|
args[3] = tf->tf_esi;
|
|
args[4] = tf->tf_edi;
|
|
args[5] = tf->tf_ebp; /* Unconfirmed */
|
|
*params = NULL; /* no copyin */
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Dump core, into a file named as described in the comments for
|
|
* expand_name(), unless the process was setuid/setgid.
|
|
*/
|
|
static int
|
|
linux_aout_coredump(struct thread *td, struct vnode *vp, off_t limit)
|
|
{
|
|
struct proc *p = td->td_proc;
|
|
struct ucred *cred = td->td_ucred;
|
|
struct vmspace *vm = p->p_vmspace;
|
|
char *tempuser;
|
|
int error;
|
|
|
|
if (ctob((uarea_pages + kstack_pages) +
|
|
vm->vm_dsize + vm->vm_ssize) >= limit)
|
|
return (EFAULT);
|
|
tempuser = malloc(ctob(uarea_pages + kstack_pages), M_TEMP,
|
|
M_WAITOK | M_ZERO);
|
|
if (tempuser == NULL)
|
|
return (ENOMEM);
|
|
PROC_LOCK(p);
|
|
fill_kinfo_proc(p, &p->p_uarea->u_kproc);
|
|
PROC_UNLOCK(p);
|
|
bcopy(p->p_uarea, tempuser, sizeof(struct user));
|
|
bcopy(td->td_frame,
|
|
tempuser + ctob(uarea_pages) +
|
|
((caddr_t)td->td_frame - (caddr_t)td->td_kstack),
|
|
sizeof(struct trapframe));
|
|
error = vn_rdwr(UIO_WRITE, vp, (caddr_t)tempuser,
|
|
ctob(uarea_pages + kstack_pages),
|
|
(off_t)0, UIO_SYSSPACE, IO_UNIT, cred, NOCRED,
|
|
(int *)NULL, td);
|
|
free(tempuser, M_TEMP);
|
|
if (error == 0)
|
|
error = vn_rdwr(UIO_WRITE, vp, vm->vm_daddr,
|
|
(int)ctob(vm->vm_dsize),
|
|
(off_t)ctob(uarea_pages + kstack_pages), UIO_USERSPACE,
|
|
IO_UNIT | IO_DIRECT, cred, NOCRED, (int *) NULL, td);
|
|
if (error == 0)
|
|
error = vn_rdwr_inchunks(UIO_WRITE, vp,
|
|
(caddr_t)trunc_page(USRSTACK - ctob(vm->vm_ssize)),
|
|
round_page(ctob(vm->vm_ssize)),
|
|
(off_t)ctob(uarea_pages + kstack_pages) +
|
|
ctob(vm->vm_dsize), UIO_USERSPACE,
|
|
IO_UNIT | IO_DIRECT, cred, NOCRED, (int *) NULL, td);
|
|
return (error);
|
|
}
|
|
/*
|
|
* If a linux binary is exec'ing something, try this image activator
|
|
* first. We override standard shell script execution in order to
|
|
* be able to modify the interpreter path. We only do this if a linux
|
|
* binary is doing the exec, so we do not create an EXEC module for it.
|
|
*/
|
|
static int exec_linux_imgact_try(struct image_params *iparams);
|
|
|
|
static int
|
|
exec_linux_imgact_try(struct image_params *imgp)
|
|
{
|
|
const char *head = (const char *)imgp->image_header;
|
|
int error = -1;
|
|
|
|
/*
|
|
* The interpreter for shell scripts run from a linux binary needs
|
|
* to be located in /compat/linux if possible in order to recursively
|
|
* maintain linux path emulation.
|
|
*/
|
|
if (((const short *)head)[0] == SHELLMAGIC) {
|
|
/*
|
|
* Run our normal shell image activator. If it succeeds attempt
|
|
* to use the alternate path for the interpreter. If an alternate
|
|
* path is found, use our stringspace to store it.
|
|
*/
|
|
if ((error = exec_shell_imgact(imgp)) == 0) {
|
|
char *rpath = NULL;
|
|
|
|
linux_emul_find(FIRST_THREAD_IN_PROC(imgp->proc), NULL,
|
|
imgp->interpreter_name, &rpath, 0);
|
|
if (rpath != imgp->interpreter_name) {
|
|
int len = strlen(rpath) + 1;
|
|
|
|
if (len <= MAXSHELLCMDLEN) {
|
|
memcpy(imgp->interpreter_name, rpath, len);
|
|
}
|
|
free(rpath, M_TEMP);
|
|
}
|
|
}
|
|
}
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* exec_setregs may initialize some registers differently than Linux
|
|
* does, thus potentially confusing Linux binaries. If necessary, we
|
|
* override the exec_setregs default(s) here.
|
|
*/
|
|
static void
|
|
exec_linux_setregs(struct thread *td, u_long entry,
|
|
u_long stack, u_long ps_strings)
|
|
{
|
|
struct pcb *pcb = td->td_pcb;
|
|
|
|
exec_setregs(td, entry, stack, ps_strings);
|
|
|
|
/* Linux sets %gs to 0, we default to _udatasel */
|
|
pcb->pcb_gs = 0; load_gs(0);
|
|
}
|
|
|
|
struct sysentvec linux_sysvec = {
|
|
LINUX_SYS_MAXSYSCALL,
|
|
linux_sysent,
|
|
0xff,
|
|
LINUX_SIGTBLSZ,
|
|
bsd_to_linux_signal,
|
|
ELAST + 1,
|
|
bsd_to_linux_errno,
|
|
translate_traps,
|
|
linux_fixup,
|
|
linux_sendsig,
|
|
linux_sigcode,
|
|
&linux_szsigcode,
|
|
linux_prepsyscall,
|
|
"Linux a.out",
|
|
linux_aout_coredump,
|
|
exec_linux_imgact_try,
|
|
LINUX_MINSIGSTKSZ,
|
|
PAGE_SIZE,
|
|
VM_MIN_ADDRESS,
|
|
VM_MAXUSER_ADDRESS,
|
|
USRSTACK,
|
|
PS_STRINGS,
|
|
VM_PROT_ALL,
|
|
exec_copyout_strings,
|
|
exec_linux_setregs
|
|
};
|
|
|
|
struct sysentvec elf_linux_sysvec = {
|
|
LINUX_SYS_MAXSYSCALL,
|
|
linux_sysent,
|
|
0xff,
|
|
LINUX_SIGTBLSZ,
|
|
bsd_to_linux_signal,
|
|
ELAST + 1,
|
|
bsd_to_linux_errno,
|
|
translate_traps,
|
|
elf_linux_fixup,
|
|
linux_sendsig,
|
|
linux_sigcode,
|
|
&linux_szsigcode,
|
|
linux_prepsyscall,
|
|
"Linux ELF",
|
|
elf32_coredump,
|
|
exec_linux_imgact_try,
|
|
LINUX_MINSIGSTKSZ,
|
|
PAGE_SIZE,
|
|
VM_MIN_ADDRESS,
|
|
VM_MAXUSER_ADDRESS,
|
|
USRSTACK,
|
|
PS_STRINGS,
|
|
VM_PROT_ALL,
|
|
exec_copyout_strings,
|
|
exec_linux_setregs
|
|
};
|
|
|
|
static Elf32_Brandinfo linux_brand = {
|
|
ELFOSABI_LINUX,
|
|
EM_386,
|
|
"Linux",
|
|
"/compat/linux",
|
|
"/lib/ld-linux.so.1",
|
|
&elf_linux_sysvec
|
|
};
|
|
|
|
static Elf32_Brandinfo linux_glibc2brand = {
|
|
ELFOSABI_LINUX,
|
|
EM_386,
|
|
"Linux",
|
|
"/compat/linux",
|
|
"/lib/ld-linux.so.2",
|
|
&elf_linux_sysvec
|
|
};
|
|
|
|
Elf32_Brandinfo *linux_brandlist[] = {
|
|
&linux_brand,
|
|
&linux_glibc2brand,
|
|
NULL
|
|
};
|
|
|
|
static int
|
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linux_elf_modevent(module_t mod, int type, void *data)
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{
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Elf32_Brandinfo **brandinfo;
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int error;
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struct linux_ioctl_handler **lihp;
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|
|
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error = 0;
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|
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switch(type) {
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case MOD_LOAD:
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for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
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++brandinfo)
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if (elf32_insert_brand_entry(*brandinfo) < 0)
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error = EINVAL;
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|
if (error == 0) {
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|
SET_FOREACH(lihp, linux_ioctl_handler_set)
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|
linux_ioctl_register_handler(*lihp);
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|
if (bootverbose)
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printf("Linux ELF exec handler installed\n");
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} else
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|
printf("cannot insert Linux ELF brand handler\n");
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|
break;
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case MOD_UNLOAD:
|
|
for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
|
|
++brandinfo)
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|
if (elf32_brand_inuse(*brandinfo))
|
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error = EBUSY;
|
|
if (error == 0) {
|
|
for (brandinfo = &linux_brandlist[0];
|
|
*brandinfo != NULL; ++brandinfo)
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|
if (elf32_remove_brand_entry(*brandinfo) < 0)
|
|
error = EINVAL;
|
|
}
|
|
if (error == 0) {
|
|
SET_FOREACH(lihp, linux_ioctl_handler_set)
|
|
linux_ioctl_unregister_handler(*lihp);
|
|
if (bootverbose)
|
|
printf("Linux ELF exec handler removed\n");
|
|
linux_mib_destroy();
|
|
} else
|
|
printf("Could not deinstall ELF interpreter entry\n");
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
static moduledata_t linux_elf_mod = {
|
|
"linuxelf",
|
|
linux_elf_modevent,
|
|
0
|
|
};
|
|
|
|
DECLARE_MODULE(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
|