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Switch libc from using _sig{procmask,action,suspend} symbols, which

Browse Source 
are aliases for the syscall stubs and are plt-interposed, to the
libc-private aliases of internally interposed sigprocmask() etc.

Since e.g. _sigaction is not interposed by libthr, calling signal()
removes thr_sighandler() from the handler slot etc.  The result was
breaking signal semantic and rtld locking.

The added __libc_sigprocmask and other symbols are hidden, they are
not exported and cannot be called through PLT.  The setjmp/longjmp
functions for x86 were changed to use direct calls, and since
PIC_PROLOGUE only needed for functional PLT indirection on i386, it is
removed as well.

The PowerPC bug of calling the syscall directly in the setjmp/longjmp
implementation is kept as is.

Reported by:	Pete French <petefrench@ingresso.co.uk>
Tested by:	Michiel Boland <boland37@xs4all.nl>
Reviewed by:	jilles (previous version)
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2015-08-29 14:25:01 +00:00
parent 9202485814
commit bd6060a1c6
22 changed files with 104 additions and 121 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
lib/libc/amd64/gen/setjmp.S
View File

@ -55,7 +55,7 @@ ENTRY(setjmp)
movq $0,%rsi /* (sigset_t*)set */
leaq 72(%rcx),%rdx /* 9,10; (sigset_t*)oset */
/* stack is 16-byte aligned */
call PIC_PLT(CNAME(_sigprocmask))
call __libc_sigprocmask
popq %rdi
movq %rdi,%rcx
movq 0(%rsp),%rdx /* retval */
@ -82,7 +82,7 @@ ENTRY(__longjmp)
leaq 72(%rdx),%rsi /* (sigset_t*)set */
movq $0,%rdx /* (sigset_t*)oset */
subq $0x8,%rsp /* make the stack 16-byte aligned */
call PIC_PLT(CNAME(_sigprocmask))
call __libc_sigprocmask
addq $0x8,%rsp
popq %rsi
popq %rdi /* jmpbuf */

4
lib/libc/amd64/gen/sigsetjmp.S
View File

@ -63,7 +63,7 @@ ENTRY(sigsetjmp)
movq $0,%rsi /* (sigset_t*)set */
leaq 72(%rcx),%rdx /* 9,10 (sigset_t*)oset */
/* stack is 16-byte aligned */
call PIC_PLT(CNAME(_sigprocmask))
call __libc_sigprocmask
popq %rdi
2: movq %rdi,%rcx
movq 0(%rsp),%rdx /* retval */
@ -91,7 +91,7 @@ ENTRY(__siglongjmp)
leaq 72(%rdx),%rsi /* (sigset_t*)set */
movq $0,%rdx /* (sigset_t*)oset */
subq $0x8,%rsp /* make the stack 16-byte aligned */
call PIC_PLT(CNAME(_sigprocmask))
call __libc_sigprocmask
addq $0x8,%rsp
popq %rsi
popq %rdi /* jmpbuf */

28
lib/libc/compat-43/sigcompat.c
View File

@ -59,7 +59,7 @@ sigvec(signo, sv, osv)
} else
sap = NULL;
osap = osv != NULL ? &osa : NULL;
ret = _sigaction(signo, sap, osap);
ret = __libc_sigaction(signo, sap, osap);
if (ret == 0 && osv != NULL) {
osv->sv_handler = osa.sa_handler;
osv->sv_flags = osa.sa_flags ^ SV_INTERRUPT;
@ -77,7 +77,7 @@ sigsetmask(mask)
sigemptyset(&set);
set.__bits[0] = mask;
n = _sigprocmask(SIG_SETMASK, &set, &oset);
n = __libc_sigprocmask(SIG_SETMASK, &set, &oset);
if (n)
return (n);
return (oset.__bits[0]);
@ -92,7 +92,7 @@ sigblock(mask)
sigemptyset(&set);
set.__bits[0] = mask;
n = _sigprocmask(SIG_BLOCK, &set, &oset);
n = __libc_sigprocmask(SIG_BLOCK, &set, &oset);
if (n)
return (n);
return (oset.__bits[0]);
@ -105,7 +105,7 @@ sigpause(int mask)
sigemptyset(&set);
set.__bits[0] = mask;
return (_sigsuspend(&set));
return (__libc_sigsuspend(&set));
}
int
@ -113,11 +113,11 @@ xsi_sigpause(int sig)
{
sigset_t set;
if (_sigprocmask(SIG_BLOCK, NULL, &set) == -1)
if (__libc_sigprocmask(SIG_BLOCK, NULL, &set) == -1)
return (-1);
if (sigdelset(&set, sig) == -1)
return (-1);
return (_sigsuspend(&set));
return (__libc_sigsuspend(&set));
}
int
@ -128,7 +128,7 @@ sighold(int sig)
sigemptyset(&set);
if (sigaddset(&set, sig) == -1)
return (-1);
return (_sigprocmask(SIG_BLOCK, &set, NULL));
return (__libc_sigprocmask(SIG_BLOCK, &set, NULL));
}
int
@ -138,7 +138,7 @@ sigignore(int sig)
bzero(&sa, sizeof(sa));
sa.sa_handler = SIG_IGN;
return (_sigaction(sig, &sa, NULL));
return (__libc_sigaction(sig, &sa, NULL));
}
int
@ -149,7 +149,7 @@ sigrelse(int sig)
sigemptyset(&set);
if (sigaddset(&set, sig) == -1)
return (-1);
return (_sigprocmask(SIG_UNBLOCK, &set, NULL));
return (__libc_sigprocmask(SIG_UNBLOCK, &set, NULL));
}
void
@ -161,26 +161,26 @@ void
sigemptyset(&set);
if (sigaddset(&set, sig) == -1)
return (SIG_ERR);
if (_sigprocmask(SIG_BLOCK, NULL, &pset) == -1)
if (__libc_sigprocmask(SIG_BLOCK, NULL, &pset) == -1)
return (SIG_ERR);
if ((__sighandler_t *)disp == SIG_HOLD) {
if (_sigprocmask(SIG_BLOCK, &set, &pset) == -1)
if (__libc_sigprocmask(SIG_BLOCK, &set, &pset) == -1)
return (SIG_ERR);
if (sigismember(&pset, sig))
return (SIG_HOLD);
else {
if (_sigaction(sig, NULL, &psa) == -1)
if (__libc_sigaction(sig, NULL, &psa) == -1)
return (SIG_ERR);
return (psa.sa_handler);
}
} else {
if (_sigprocmask(SIG_UNBLOCK, &set, &pset) == -1)
if (__libc_sigprocmask(SIG_UNBLOCK, &set, &pset) == -1)
return (SIG_ERR);
}
bzero(&sa, sizeof(sa));
sa.sa_handler = disp;
if (_sigaction(sig, &sa, &psa) == -1)
if (__libc_sigaction(sig, &sa, &psa) == -1)
return (SIG_ERR);
if (sigismember(&pset, sig))
return (SIG_HOLD);

5
lib/libc/db/btree/bt_open.c
View File

@ -57,6 +57,7 @@ __FBSDID("$FreeBSD$");
#include <string.h>
#include <unistd.h>
#include "un-namespace.h"
#include "libc_private.h"
#include <db.h>
#include "btree.h"
@ -401,10 +402,10 @@ tmp(void)
}
(void)sigfillset(&set);
(void)_sigprocmask(SIG_BLOCK, &set, &oset);
(void)__libc_sigprocmask(SIG_BLOCK, &set, &oset);
if ((fd = mkostemp(path, O_CLOEXEC)) != -1)
(void)unlink(path);
(void)_sigprocmask(SIG_SETMASK, &oset, NULL);
(void)__libc_sigprocmask(SIG_SETMASK, &oset, NULL);
return(fd);
}

5
lib/libc/db/hash/hash_page.c
View File

@ -66,6 +66,7 @@ __FBSDID("$FreeBSD$");
#include <assert.h>
#endif
#include "un-namespace.h"
#include "libc_private.h"
#include <db.h>
#include "hash.h"
@ -861,10 +862,10 @@ open_temp(HTAB *hashp)
/* Block signals; make sure file goes away at process exit. */
(void)sigfillset(&set);
(void)_sigprocmask(SIG_BLOCK, &set, &oset);
(void)__libc_sigprocmask(SIG_BLOCK, &set, &oset);
if ((hashp->fp = mkostemp(path, O_CLOEXEC)) != -1)
(void)unlink(path);
(void)_sigprocmask(SIG_SETMASK, &oset, (sigset_t *)NULL);
(void)__libc_sigprocmask(SIG_SETMASK, &oset, (sigset_t *)NULL);
return (hashp->fp != -1 ? 0 : -1);
}

8
lib/libc/gen/daemon.c
View File

@ -41,10 +41,10 @@ __FBSDID("$FreeBSD$");
#include <signal.h>
#include <unistd.h>
#include "un-namespace.h"
#include "libc_private.h"
int
daemon(nochdir, noclose)
int nochdir, noclose;
daemon(int nochdir, int noclose)
{
struct sigaction osa, sa;
int fd;
@ -56,7 +56,7 @@ daemon(nochdir, noclose)
sigemptyset(&sa.sa_mask);
sa.sa_handler = SIG_IGN;
sa.sa_flags = 0;
osa_ok = _sigaction(SIGHUP, &sa, &osa);
osa_ok = __libc_sigaction(SIGHUP, &sa, &osa);
switch (fork()) {
case -1:
@ -74,7 +74,7 @@ daemon(nochdir, noclose)
newgrp = setsid();
oerrno = errno;
if (osa_ok != -1)
_sigaction(SIGHUP, &osa, NULL);
__libc_sigaction(SIGHUP, &osa, NULL);
if (newgrp == -1) {
errno = oerrno;

9
lib/libc/gen/posix_spawn.c
View File

@ -118,15 +118,18 @@ process_spawnattr(const posix_spawnattr_t sa)
return (errno);
}
/* Set signal masks/defaults */
/*
* Set signal masks/defaults.
* Use unwrapped syscall, libthr is in undefined state after vfork().
*/
if (sa->sa_flags & POSIX_SPAWN_SETSIGMASK) {
_sigprocmask(SIG_SETMASK, &sa->sa_sigmask, NULL);
__libc_sigprocmask(SIG_SETMASK, &sa->sa_sigmask, NULL);
}
if (sa->sa_flags & POSIX_SPAWN_SETSIGDEF) {
for (i = 1; i <= _SIG_MAXSIG; i++) {
if (sigismember(&sa->sa_sigdefault, i))
if (_sigaction(i, &sigact, NULL) != 0)
if (__libc_sigaction(i, &sigact, NULL) != 0)
return (errno);
}
}

37
lib/libc/gen/readpassphrase.c
View File

@ -36,6 +36,7 @@ __FBSDID("$FreeBSD$");
#include <unistd.h>
#include <readpassphrase.h>
#include "un-namespace.h"
#include "libc_private.h"
static volatile sig_atomic_t signo[NSIG];
@ -104,15 +105,15 @@ readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0; /* don't restart system calls */
sa.sa_handler = handler;
(void)_sigaction(SIGALRM, &sa, &savealrm);
(void)_sigaction(SIGHUP, &sa, &savehup);
(void)_sigaction(SIGINT, &sa, &saveint);
(void)_sigaction(SIGPIPE, &sa, &savepipe);
(void)_sigaction(SIGQUIT, &sa, &savequit);
(void)_sigaction(SIGTERM, &sa, &saveterm);
(void)_sigaction(SIGTSTP, &sa, &savetstp);
(void)_sigaction(SIGTTIN, &sa, &savettin);
(void)_sigaction(SIGTTOU, &sa, &savettou);
(void)__libc_sigaction(SIGALRM, &sa, &savealrm);
(void)__libc_sigaction(SIGHUP, &sa, &savehup);
(void)__libc_sigaction(SIGINT, &sa, &saveint);
(void)__libc_sigaction(SIGPIPE, &sa, &savepipe);
(void)__libc_sigaction(SIGQUIT, &sa, &savequit);
(void)__libc_sigaction(SIGTERM, &sa, &saveterm);
(void)__libc_sigaction(SIGTSTP, &sa, &savetstp);
(void)__libc_sigaction(SIGTTIN, &sa, &savettin);
(void)__libc_sigaction(SIGTTOU, &sa, &savettou);
if (!(flags & RPP_STDIN))
(void)_write(output, prompt, strlen(prompt));
@ -142,15 +143,15 @@ readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
errno == EINTR && !signo[SIGTTOU])
continue;
}
(void)_sigaction(SIGALRM, &savealrm, NULL);
(void)_sigaction(SIGHUP, &savehup, NULL);
(void)_sigaction(SIGINT, &saveint, NULL);
(void)_sigaction(SIGQUIT, &savequit, NULL);
(void)_sigaction(SIGPIPE, &savepipe, NULL);
(void)_sigaction(SIGTERM, &saveterm, NULL);
(void)_sigaction(SIGTSTP, &savetstp, NULL);
(void)_sigaction(SIGTTIN, &savettin, NULL);
(void)_sigaction(SIGTTOU, &savettou, NULL);
(void)__libc_sigaction(SIGALRM, &savealrm, NULL);
(void)__libc_sigaction(SIGHUP, &savehup, NULL);
(void)__libc_sigaction(SIGINT, &saveint, NULL);
(void)__libc_sigaction(SIGQUIT, &savequit, NULL);
(void)__libc_sigaction(SIGPIPE, &savepipe, NULL);
(void)__libc_sigaction(SIGTERM, &saveterm, NULL);
(void)__libc_sigaction(SIGTSTP, &savetstp, NULL);
(void)__libc_sigaction(SIGTTIN, &savettin, NULL);
(void)__libc_sigaction(SIGTTOU, &savettou, NULL);
if (input != STDIN_FILENO)
(void)_close(input);

5
lib/libc/gen/setmode.c
View File

@ -53,6 +53,7 @@ __FBSDID("$FreeBSD$");
#include <stdio.h>
#endif
#include "un-namespace.h"
#include "libc_private.h"
#define SET_LEN 6 /* initial # of bitcmd struct to malloc */
#define SET_LEN_INCR 4 /* # of bitcmd structs to add as needed */
@ -364,9 +365,9 @@ getumask(void)
* handler, protect them as best we can.
*/
sigfillset(&sigset);
(void)_sigprocmask(SIG_BLOCK, &sigset, &sigoset);
(void)__libc_sigprocmask(SIG_BLOCK, &sigset, &sigoset);
(void)umask(mask = umask(0));
(void)_sigprocmask(SIG_SETMASK, &sigoset, NULL);
(void)__libc_sigprocmask(SIG_SETMASK, &sigoset, NULL);
return (mask);
}

7
lib/libc/gen/siginterrupt.c
View File

@ -43,14 +43,13 @@ __FBSDID("$FreeBSD$");
* after an instance of the indicated signal.
*/
int
siginterrupt(sig, flag)
int sig, flag;
siginterrupt(int sig, int flag)
{
extern sigset_t _sigintr __hidden;
struct sigaction sa;
int ret;
if ((ret = _sigaction(sig, (struct sigaction *)0, &sa)) < 0)
if ((ret = __libc_sigaction(sig, (struct sigaction *)0, &sa)) < 0)
return (ret);
if (flag) {
sigaddset(&_sigintr, sig);
@ -59,5 +58,5 @@ siginterrupt(sig, flag)
sigdelset(&_sigintr, sig);
sa.sa_flags |= SA_RESTART;
}
return (_sigaction(sig, &sa, (struct sigaction *)0));
return (__libc_sigaction(sig, &sa, (struct sigaction *)0));
}

6
lib/libc/gen/signal.c
View File

@ -44,9 +44,7 @@ __FBSDID("$FreeBSD$");
sigset_t _sigintr __hidden; /* shared with siginterrupt */
sig_t
signal(s, a)
int s;
sig_t a;
signal(int s, sig_t a)
{
struct sigaction sa, osa;
@ -55,7 +53,7 @@ signal(s, a)
sa.sa_flags = 0;
if (!sigismember(&_sigintr, s))
sa.sa_flags |= SA_RESTART;
if (_sigaction(s, &sa, &osa) < 0)
if (__libc_sigaction(s, &sa, &osa) < 0)
return (SIG_ERR);
return (osa.sa_handler);
}

9
lib/libc/gen/wordexp.c
View File

@ -38,6 +38,7 @@
#include <unistd.h>
#include <wordexp.h>
#include "un-namespace.h"
#include "libc_private.h"
__FBSDID("$FreeBSD$");
@ -127,12 +128,12 @@ we_askshell(const char *words, wordexp_t *we, int flags)
return (WRDE_NOSPACE); /* XXX */
(void)sigemptyset(&newsigblock);
(void)sigaddset(&newsigblock, SIGCHLD);
(void)_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
(void)__libc_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
if ((pid = fork()) < 0) {
serrno = errno;
_close(pdes[0]);
_close(pdes[1]);
(void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
(void)__libc_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
errno = serrno;
return (WRDE_NOSPACE); /* XXX */
}
@ -140,7 +141,7 @@ we_askshell(const char *words, wordexp_t *we, int flags)
/*
* We are the child; make /bin/sh expand `words'.
*/
(void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
(void)__libc_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
if ((pdes[1] != STDOUT_FILENO ?
_dup2(pdes[1], STDOUT_FILENO) :
_fcntl(pdes[1], F_SETFD, 0)) < 0)
@ -222,7 +223,7 @@ we_askshell(const char *words, wordexp_t *we, int flags)
do
wpid = _waitpid(pid, &status, 0);
while (wpid < 0 && errno == EINTR);
(void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
(void)__libc_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
if (error != 0) {
errno = serrno;
return (error);

22
lib/libc/i386/gen/setjmp.S
View File

@ -50,21 +50,12 @@ __FBSDID("$FreeBSD$");
ENTRY(setjmp)
movl 4(%esp),%ecx
PIC_PROLOGUE
#ifdef PIC
subl $12,%esp /* make the stack 16-byte aligned */
#endif
leal 28(%ecx), %eax
pushl %eax /* (sigset_t*)oset */
pushl $0 /* (sigset_t*)set */
pushl $1 /* SIG_BLOCK */
call PIC_PLT(CNAME(_sigprocmask))
#ifdef PIC
addl $24,%esp
#else
call __libc_sigprocmask
addl $12,%esp
#endif
PIC_EPILOGUE
movl 4(%esp),%ecx
movl 0(%esp),%edx
movl %edx, 0(%ecx)
@ -81,21 +72,12 @@ END(setjmp)
WEAK_REFERENCE(__longjmp, longjmp)
ENTRY(__longjmp)
movl 4(%esp),%edx
PIC_PROLOGUE
#ifdef PIC
subl $12,%esp /* make the stack 16-byte aligned */
#endif
pushl $0 /* (sigset_t*)oset */
leal 28(%edx), %eax
pushl %eax /* (sigset_t*)set */
pushl $3 /* SIG_SETMASK */
call PIC_PLT(CNAME(_sigprocmask))
#ifdef PIC
addl $24,%esp
#else
call __libc_sigprocmask
addl $12,%esp
#endif
PIC_EPILOGUE
movl 4(%esp),%edx
movl 8(%esp),%eax
movl 0(%edx),%ecx

22
lib/libc/i386/gen/sigsetjmp.S
View File

@ -59,21 +59,12 @@ ENTRY(sigsetjmp)
movl %eax,44(%ecx)
testl %eax,%eax
jz 2f
PIC_PROLOGUE
#ifdef PIC
subl $12,%esp /* make the stack 16-byte aligned */
#endif
leal 28(%ecx), %eax
pushl %eax /* (sigset_t*)oset */
pushl $0 /* (sigset_t*)set */
pushl $1 /* SIG_BLOCK */
call PIC_PLT(CNAME(_sigprocmask))
#ifdef PIC
addl $24,%esp
#else
call __libc_sigprocmask
addl $12,%esp
#endif
PIC_EPILOGUE
movl 4(%esp),%ecx
2: movl 0(%esp),%edx
movl %edx, 0(%ecx)
@ -92,21 +83,12 @@ ENTRY(__siglongjmp)
movl 4(%esp),%edx
cmpl $0,44(%edx)
jz 2f
PIC_PROLOGUE
#ifdef PIC
subl $12,%esp /* make the stack 16-byte aligned */
#endif
pushl $0 /* (sigset_t*)oset */
leal 28(%edx), %eax
pushl %eax /* (sigset_t*)set */
pushl $3 /* SIG_SETMASK */
call PIC_PLT(CNAME(_sigprocmask))
#ifdef PIC
addl $24,%esp
#else
call __libc_sigprocmask
addl $12,%esp
#endif
PIC_EPILOGUE
movl 4(%esp),%edx
2: movl 8(%esp),%eax
movl 0(%edx),%ecx

5
lib/libc/include/libc_private.h
View File

@ -359,6 +359,11 @@ __pid_t __sys_wait6(enum idtype, __id_t, int *, int,
__ssize_t __sys_write(int, const void *, __size_t);
__ssize_t __sys_writev(int, const struct iovec *, int);
int __libc_sigaction(int, const struct sigaction *,
struct sigaction *) __hidden;
int __libc_sigprocmask(int, const __sigset_t *, __sigset_t *)
__hidden;
int __libc_sigsuspend(const __sigset_t *) __hidden;
int __libc_sigwait(const __sigset_t * __restrict,
int * restrict sig);
int __libc_system(const char *);

11
lib/libc/net/rcmd.c
View File

@ -58,6 +58,7 @@ __FBSDID("$FreeBSD$");
#endif
#include <arpa/nameser.h>
#include "un-namespace.h"
#include "libc_private.h"
extern int innetgr( const char *, const char *, const char *, const char * );
@ -148,7 +149,7 @@ rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)
refused = 0;
sigemptyset(&newmask);
sigaddset(&newmask, SIGURG);
_sigprocmask(SIG_BLOCK, (const sigset_t *)&newmask, &oldmask);
__libc_sigprocmask(SIG_BLOCK, (const sigset_t *)&newmask, &oldmask);
for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
s = rresvport_af(&lport, ai->ai_family);
if (s < 0) {
@ -163,7 +164,7 @@ rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)
(void)fprintf(stderr, "rcmd: socket: %s\n",
strerror(errno));
freeaddrinfo(res);
_sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask,
__libc_sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask,
NULL);
return (-1);
}
@ -181,7 +182,7 @@ rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)
(void)fprintf(stderr, "%s: %s\n",
*ahost, strerror(errno));
freeaddrinfo(res);
_sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask,
__libc_sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask,
NULL);
return (-1);
}
@ -306,7 +307,7 @@ rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)
}
goto bad2;
}
_sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL);
__libc_sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL);
freeaddrinfo(res);
return (s);
bad2:
@ -314,7 +315,7 @@ rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)
(void)_close(*fd2p);
bad:
(void)_close(s);
_sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL);
__libc_sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL);
freeaddrinfo(res);
return (-1);
}

7
lib/libc/stdio/tmpfile.c
View File

@ -46,9 +46,10 @@ __FBSDID("$FreeBSD$");
#include <string.h>
#include <paths.h>
#include "un-namespace.h"
#include "libc_private.h"
FILE *
tmpfile()
tmpfile(void)
{
sigset_t set, oset;
FILE *fp;
@ -69,7 +70,7 @@ tmpfile()
return (NULL);
sigfillset(&set);
(void)_sigprocmask(SIG_BLOCK, &set, &oset);
(void)__libc_sigprocmask(SIG_BLOCK, &set, &oset);
fd = mkstemp(buf);
if (fd != -1)
@ -77,7 +78,7 @@ tmpfile()
free(buf);
(void)_sigprocmask(SIG_SETMASK, &oset, NULL);
(void)__libc_sigprocmask(SIG_SETMASK, &oset, NULL);
if (fd == -1)
return (NULL);

6
lib/libc/stdlib/abort.c
View File

@ -61,7 +61,7 @@ abort()
* any errors -- ISO C doesn't allow abort to return anyway.
*/
sigdelset(&act.sa_mask, SIGABRT);
(void)_sigprocmask(SIG_SETMASK, &act.sa_mask, NULL);
(void)__libc_sigprocmask(SIG_SETMASK, &act.sa_mask, NULL);
(void)raise(SIGABRT);
/*
@ -71,9 +71,9 @@ abort()
act.sa_handler = SIG_DFL;
act.sa_flags = 0;
sigfillset(&act.sa_mask);
(void)_sigaction(SIGABRT, &act, NULL);
(void)__libc_sigaction(SIGABRT, &act, NULL);
sigdelset(&act.sa_mask, SIGABRT);
(void)_sigprocmask(SIG_SETMASK, &act.sa_mask, NULL);
(void)__libc_sigprocmask(SIG_SETMASK, &act.sa_mask, NULL);
(void)raise(SIGABRT);
exit(1);
}

22
lib/libc/stdlib/system.c
View File

@ -70,16 +70,20 @@ __libc_system(const char *command)
(void)sigaddset(&newsigblock, SIGCHLD);
(void)sigaddset(&newsigblock, SIGINT);
(void)sigaddset(&newsigblock, SIGQUIT);
(void)_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
(void)__libc_sigprocmask(SIG_BLOCK, &newsigblock, &oldsigblock);
switch(pid = vfork()) {
/*
* In the child, use unwrapped syscalls. libthr is in
* undefined state after vfork().
*/
case -1: /* error */
(void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
(void)__libc_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
return (-1);
case 0: /* child */
/*
* Restore original signal dispositions and exec the command.
*/
(void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
(void)__sys_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
execl(_PATH_BSHELL, "sh", "-c", command, (char *)NULL);
_exit(127);
}
@ -92,16 +96,16 @@ __libc_system(const char *command)
memset(&ign, 0, sizeof(ign));
ign.sa_handler = SIG_IGN;
(void)sigemptyset(&ign.sa_mask);
(void)_sigaction(SIGINT, &ign, &intact);
(void)_sigaction(SIGQUIT, &ign, &quitact);
(void)__libc_sigaction(SIGINT, &ign, &intact);
(void)__libc_sigaction(SIGQUIT, &ign, &quitact);
savedpid = pid;
do {
pid = _wait4(savedpid, &pstat, 0, (struct rusage *)0);
} while (pid == -1 && errno == EINTR);
(void)_sigaction(SIGINT, &intact, NULL);
(void)_sigaction(SIGQUIT, &quitact, NULL);
(void)_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
return(pid == -1 ? -1 : pstat);
(void)__libc_sigaction(SIGINT, &intact, NULL);
(void)__libc_sigaction(SIGQUIT, &quitact, NULL);
(void)__libc_sigprocmask(SIG_SETMASK, &oldsigblock, NULL);
return (pid == -1 ? -1 : pstat);
}
__weak_reference(__libc_system, __system);

1
lib/libc/sys/sigaction.c
View File

@ -38,6 +38,7 @@ __FBSDID("$FreeBSD$");
#include "libc_private.h"
__weak_reference(__sys_sigaction, __sigaction);
__weak_reference(sigaction, __libc_sigaction);
#pragma weak sigaction
int

1
lib/libc/sys/sigprocmask.c
View File

@ -38,6 +38,7 @@ __FBSDID("$FreeBSD$");
#include "libc_private.h"
__weak_reference(__sys_sigprocmask, __sigprocmask);
__weak_reference(sigprocmask, __libc_sigprocmask);
#pragma weak sigprocmask
int

1
lib/libc/sys/sigsuspend.c
View File

@ -38,6 +38,7 @@ __FBSDID("$FreeBSD$");
#include "libc_private.h"
__weak_reference(__sys_sigsuspend, __sigsuspend);
__weak_reference(sigsuspend, __libc_sigsuspend);
#pragma weak sigsuspend
int