d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
52f3c44efe
freebsd-dev/sys/kern
History
Konstantin Belousov 52f3c44efe Fix two issues with /dev/mem access on amd64, both causing kernel page 
faults.

First, for accesses to direct map region should check for the limit by
which direct map is instantiated.

Second, for accesses to the kernel map, success returned from the
kernacc(9) does not guarantee that consequent attempt to read or write
to the checked address succeed, since other thread might invalidate
the address meantime.  Add a new thread private flag TDP_DEVMEMIO,
which instructs vm_fault() to return error when fault happens on the
MAP_ENTRY_NOFAULT entry, instead of panicing.  The trap handler would
then see a page fault from access, and recover in normal way, making
/dev/mem access safer.

Remove GIANT_REQUIRED from the amd64 memrw(), since it is not needed
and having Giant locked does not solve issues for amd64.

Note that at least the second issue exists on other architectures, and
requires similar patching for md code.

Reported and tested by:	clusteradm (gjb, sbruno)
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2014-03-21 14:25:09 +00:00
..
bus_if.m Add a BUS_CHILD_DELETED() method that a bus can hook to allow it to cleanup 2012-08-21 18:13:09 +00:00
capabilities.conf Allow sigwait(2) in capabilities mode. 2014-01-28 01:49:49 +00:00
clock_if.m
cpufreq_if.m
device_if.m Revert r239178 and implement two new functions, namely 2012-08-15 15:42:57 +00:00
genassym.sh
imgact_aout.c Cosmetics: define FREEBSD32_MINUSER and AOUT32_MINUSER for struct 2012-07-22 13:41:45 +00:00
imgact_elf32.c
imgact_elf64.c
imgact_elf.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
imgact_gzip.c Add a mmap flag (MAP_32BIT) on 64-bit platforms to request that a mapping use 2013-09-09 18:11:59 +00:00
imgact_shell.c
inflate.c
init_main.c Debugging. My attempt at EVENTHANDLER(multiuser) was a failure; use EVENTHANDLER(mountroot) instead. 2013-10-08 06:54:52 +00:00
init_sysent.c Regen per r263318. 2014-03-18 21:34:11 +00:00
kern_acct.c acct: create a special plimit object and set it for exiting processes 2013-06-30 19:08:06 +00:00
kern_alq.c The fix committed in r250951 replaced the reported panic with a deadlock... gold 2013-06-17 09:49:07 +00:00
kern_clock.c dtrace sdt: remove the ugly sname parameter of SDT_PROBE_DEFINE 2013-11-26 08:46:27 +00:00
kern_clocksource.c Fix periodic per-CPU timers startup on boot. 2013-12-16 13:52:18 +00:00
kern_condvar.c Fix lc_lock/lc_unlock() support for rmlocks held in shared mode. With 2013-09-20 23:06:21 +00:00
kern_conf.c Remove global device lock acquisition from dev_relthread(), replacing it 2013-10-22 10:40:26 +00:00
kern_cons.c Rework the EARLY_PRINTF mechanism. Instead of defining a special eprintf() 2014-02-12 00:53:38 +00:00
kern_context.c
kern_cpu.c Revert r175376 and tune cpufreq(4) frequency comparison logic instead. 2012-03-10 18:56:16 +00:00
kern_cpuset.c Several improvements to rmlock(9). Many of these are based on patches 2013-06-25 18:44:15 +00:00
kern_ctf.c Remove the support for using non-mpsafe filesystem modules. 2012-10-22 17:50:54 +00:00
kern_descrip.c Take filedesc lock only for reading when allocating new fdtable. 2014-03-21 01:34:19 +00:00
kern_dtrace.c
kern_environment.c Make getenv_*() functions and respectively TUNABLE_*_FETCH() macros not 2013-11-01 10:32:33 +00:00
kern_et.c Fix incorrect assertion that caused panic when periodic-only timers used. 2013-03-13 06:42:01 +00:00
kern_event.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
kern_exec.c Make the array pointed to by AT_PAGESIZES auxv properly aligned. 2014-03-19 12:35:04 +00:00
kern_exit.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
kern_fail.c
kern_ffclock.c
kern_fork.c The fasttrap fork handler is responsible for removing tracepoints in the 2013-12-18 01:41:52 +00:00
kern_gzio.c Remove the support for using non-mpsafe filesystem modules. 2012-10-22 17:50:54 +00:00
kern_hhook.c Move hhook's per-vnet initialisation to an earlier SYSINIT SI_SUB stage to 2013-06-15 10:08:34 +00:00
kern_idle.c
kern_intr.c Snapshot. This passes the build test, but has not yet been finished or debugged. 2013-10-04 06:55:06 +00:00
kern_jail.c Remove AppleTalk support. 2014-03-14 06:29:43 +00:00
kern_khelp.c Cleanup and simplification in khelp_{register|deregister}_helper(). No 2013-06-15 06:45:17 +00:00
kern_kthread.c Do not use potentially stale thread in kthread_add() 2013-08-17 17:02:43 +00:00
kern_ktr.c Drop the 3rd clause from all 3 clause BSD licenses where I am the sole 2014-02-05 18:13:27 +00:00
kern_ktrace.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
kern_linker.c Use correct types for sizeof() in the calculations for the malloc(9) sizes [1]. 2014-03-12 10:25:26 +00:00
kern_lock.c - For kernel compiled only with KDTRACE_HOOKS and not any lock debugging 2013-11-25 07:38:45 +00:00
kern_lockf.c
kern_lockstat.c - For kernel compiled only with KDTRACE_HOOKS and not any lock debugging 2013-11-25 07:38:45 +00:00
kern_loginclass.c
kern_malloc.c On sparc64, VM_KMEM_SIZE_SCALE is not a constant expression, so it 2014-02-23 17:37:24 +00:00
kern_mbuf.c Ignore attempts to set the nmbcluster sysctls to their current value 2013-10-10 16:11:34 +00:00
kern_mib.c Rename sysctl kern.supported_abis to kern.supported_archs, since it gives 2013-12-04 16:38:40 +00:00
kern_module.c Fix a typo. 2012-08-22 20:01:57 +00:00
kern_mtxpool.c
kern_mutex.c - For kernel compiled only with KDTRACE_HOOKS and not any lock debugging 2013-11-25 07:38:45 +00:00
kern_ntptime.c rename scheduler->swapper and SI_SUB_RUN_SCHEDULER->SI_SUB_LAST 2013-07-24 09:45:31 +00:00
kern_osd.c
kern_physio.c Fix some issues in change 254760 pointed out by Bruce Evans: 2013-08-29 16:41:40 +00:00
kern_pmc.c Add software PMC support. 2012-03-28 20:58:30 +00:00
kern_poll.c The r48589 promised to remove implicit inclusion of if_var.h soon. Prepare 2013-10-26 17:58:36 +00:00
kern_priv.c dtrace sdt: remove the ugly sname parameter of SDT_PROBE_DEFINE 2013-11-26 08:46:27 +00:00
kern_proc.c Expose OBJT_MGTDEVICE VM objects used for GEM/TTM with drm2 as an 2014-02-11 21:57:37 +00:00
kern_prot.c Style fix 2012-11-14 10:33:12 +00:00
kern_racct.c dtrace sdt: remove the ugly sname parameter of SDT_PROBE_DEFINE 2013-11-26 08:46:27 +00:00
kern_rangelock.c Change the queue of locks in kern_rangelock.c from holding lock requests in 2013-08-15 20:19:17 +00:00
kern_rctl.c Add CPU percentage limit enforcement to RCTL. The resouce name is "pcpu". 2012-10-26 16:01:08 +00:00
kern_resource.c rlimit: avoid unnecessary copying of rlimits 2013-12-13 20:54:45 +00:00
kern_rmlock.c - For kernel compiled only with KDTRACE_HOOKS and not any lock debugging 2013-11-25 07:38:45 +00:00
kern_rwlock.c Drop the 3rd clause from all 3 clause BSD licenses where I am the sole 2014-02-05 18:13:27 +00:00
kern_sdt.c Print a backtrace if the SDT(9) stub gets called so that there's at least 2014-02-22 01:41:45 +00:00
kern_sema.c
kern_sharedpage.c Remove the deprecated VM_ALLOC_RETRY flag for the vm_page_grab(9). 2013-08-22 07:39:53 +00:00
kern_shutdown.c Make panic_reboot_wait_time static. 2013-12-05 03:01:41 +00:00
kern_sig.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
kern_switch.c Add a comment on why inlining critical_enter() may not be a good idea 2012-12-09 04:54:22 +00:00
kern_sx.c - For kernel compiled only with KDTRACE_HOOKS and not any lock debugging 2013-11-25 07:38:45 +00:00
kern_synch.c use saner calculations in should_yield 2013-11-26 14:00:50 +00:00
kern_syscalls.c
kern_sysctl.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
kern_tc.c - Make callout(9) tickless, relying on eventtimers(4) as backend for 2013-03-04 11:09:56 +00:00
kern_thr.c Stop treating td_sigmask specially for the purposes of new thread 2012-05-26 20:03:47 +00:00
kern_thread.c dtrace sdt: remove the ugly sname parameter of SDT_PROBE_DEFINE 2013-11-26 08:46:27 +00:00
kern_time.c Implement compat32 wrappers for the ktimer_* syscalls. 2013-07-21 19:43:52 +00:00
kern_timeout.c Include the CPU id in the per-CPU timer swi thread descriptions. 2014-02-14 23:19:51 +00:00
kern_umtx.c Fix comments. 2014-03-19 12:45:40 +00:00
kern_uuid.c Fix a bug in be_uuid_dec(); it called le16dec() instead of be16dec(), 2014-02-13 22:24:36 +00:00
kern_xxx.c
ksched.c sched_rr_interval() seems always returned period in hz ticks, but same 2012-08-10 18:19:57 +00:00
link_elf_obj.c Add a mmap flag (MAP_32BIT) on 64-bit platforms to request that a mapping use 2013-09-09 18:11:59 +00:00
link_elf.c Add a mmap flag (MAP_32BIT) on 64-bit platforms to request that a mapping use 2013-09-09 18:11:59 +00:00
linker_if.m
Make.tags.inc Remove AppleTalk support. 2014-03-14 06:29:43 +00:00
Makefile
makesyscalls.sh Fix syscalls that can be loaded as kernel modules - they were not given 2013-12-15 23:19:42 +00:00
md4c.c
md5c.c
p1003_1b.c
posix4_mib.c
sched_4bsd.c The arguments to sched:::off-cpu are the thread and associated process of 2013-12-29 17:08:30 +00:00
sched_ule.c Fix GENERIC build. 2014-03-19 00:38:27 +00:00
serdev_if.m
stack_protector.c
subr_acl_nfs4.c Fix bug where NFSv4 ACL enforcement code wouldn't unconditionally 2012-04-17 14:54:00 +00:00
subr_acl_posix1e.c Add module load/unload stubs. 2012-03-13 20:27:48 +00:00
subr_autoconf.c
subr_blist.c Remove reference to the rlist code from comments, and fix a typo visible 2013-02-05 20:08:33 +00:00
subr_bufring.c
subr_bus_dma.c Add bus_dmamap_load_ma() function to load map with the array of 2013-10-27 21:39:16 +00:00
subr_bus.c Add YARROW_RNG and FORTUNA_RNG to sys/conf/options. 2013-10-08 11:05:26 +00:00
subr_busdma_bufalloc.c Replace kernel virtual address space allocation with vmem. This provides 2013-08-07 06:21:20 +00:00
subr_capability.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
subr_clock.c
subr_counter.c Create two public UMA_ZONE_PCPU zones: 64 bit sized and pointer sized. 2014-02-10 19:59:46 +00:00
subr_devstat.c dtrace sdt: remove the ugly sname parameter of SDT_PROBE_DEFINE 2013-11-26 08:46:27 +00:00
subr_disk.c
subr_dummy_vdso_tc.c Implement mechanism to export some kernel timekeeping data to 2012-06-22 07:06:40 +00:00
subr_eventhandler.c
subr_fattime.c
subr_firmware.c Correct sizeof usage 2012-06-25 05:41:16 +00:00
subr_hash.c
subr_hints.c Preserve one character space for a trailing '\0'. 2014-02-14 20:54:03 +00:00
subr_kdb.c When reentering kdb, typically due to a bug causing trap or assert in 2013-10-27 16:20:52 +00:00
subr_kobj.c
subr_lock.c Drop the 3rd clause from all 3 clause BSD licenses where I am the sole 2014-02-05 18:13:27 +00:00
subr_log.c MFcalloutng (r244255 by mav, with minor changes): 2013-03-04 16:07:55 +00:00
subr_mbpool.c Give (*ext_free) an int return value allowing for very sophisticated 2013-08-25 10:57:09 +00:00
subr_mchain.c Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
subr_module.c
subr_msgbuf.c - Clean up timestamps in msgbuf code. The timestamps should now be 2012-03-19 00:36:32 +00:00
subr_param.c Add VM_LAST, a special last element in enum VM_GUEST and use it in CTASSERT 2013-11-12 20:13:10 +00:00
subr_pcpu.c Create two public UMA_ZONE_PCPU zones: 64 bit sized and pointer sized. 2014-02-10 19:59:46 +00:00
subr_pctrie.c - Add a new general purpose path-compressed radix trie which can be used 2013-05-12 04:05:01 +00:00
subr_power.c
subr_prf.c Combine similar code from vprintf(9) and log(9). 2014-03-14 01:17:11 +00:00
subr_prof.c
subr_rman.c Unlock in the error path to prevent a lock leak. 2012-05-31 17:27:05 +00:00
subr_rtc.c
subr_sbuf.c Always request zeroed memory, in case we're dumb enough to leak it later. 2013-09-22 23:47:56 +00:00
subr_scanf.c
subr_sglist.c Add sglist_append_bio(9) to append a struct bio's data to a sglist 2014-01-13 04:41:08 +00:00
subr_sleepqueue.c Drop the 3rd clause from all 3 clause BSD licenses where I am the sole 2014-02-05 18:13:27 +00:00
subr_smp.c Drop the 3rd clause from all 3 clause BSD licenses where I am the sole 2014-02-05 18:13:27 +00:00
subr_stack.c
subr_syscall.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
subr_taskqueue.c add taskqueue_drain_all 2013-11-28 18:56:34 +00:00
subr_terminal.c Fix copy-pasting of CJK fullwidth characters. 2013-12-24 18:42:26 +00:00
subr_trap.c Fix two issues with /dev/mem access on amd64, both causing kernel page 2014-03-21 14:25:09 +00:00
subr_turnstile.c dtrace sdt: remove the ugly sname parameter of SDT_PROBE_DEFINE 2013-11-26 08:46:27 +00:00
subr_uio.c Remove zero-copy sockets code. It only worked for anonymous memory, 2013-09-16 06:25:54 +00:00
subr_unit.c Move the definition of the struct unrhdr into a separate header file, 2013-08-30 07:37:45 +00:00
subr_vmem.c Create own free list for each of the first 32 possible allocation sizes. 2013-12-11 21:48:04 +00:00
subr_witness.c Remove AppleTalk support. 2014-03-14 06:29:43 +00:00
sys_capability.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
sys_generic.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
sys_pipe.c Add a mmap flag (MAP_32BIT) on 64-bit platforms to request that a mapping use 2013-09-09 18:11:59 +00:00
sys_procdesc.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
sys_process.c Extend the support for exempting processes from being killed when swap is 2013-09-19 18:53:42 +00:00
sys_socket.c The r48589 promised to remove implicit inclusion of if_var.h soon. Prepare 2013-10-26 17:58:36 +00:00
syscalls.c Regen per r263318. 2014-03-18 21:34:11 +00:00
syscalls.master Remove dead code from umtx support: 2014-03-18 21:32:03 +00:00
systrace_args.c Regen per r263318. 2014-03-18 21:34:11 +00:00
sysv_ipc.c
sysv_msg.c
sysv_sem.c
sysv_shm.c Eliminate the gratuitous use of mmap(2) flags from the implementation 2013-11-12 17:46:11 +00:00
tty_compat.c
tty_info.c
tty_inq.c
tty_outq.c
tty_pts.c Make sendfile() a method in the struct fileops. Currently only 2013-08-15 07:54:31 +00:00
tty_tty.c
tty_ttydisc.c Correct SIGTTIN handling. 2012-10-25 09:05:21 +00:00
tty.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
uipc_accf.c
uipc_debug.c Fix socket buffer timeouts precision using the new sbintime_t KPI instead 2013-09-01 23:34:53 +00:00
uipc_domain.c - Implement two new system calls: 2013-03-02 21:11:30 +00:00
uipc_mbuf2.c Mechanically substitute flags from historic mbuf allocator with 2012-12-05 08:04:20 +00:00
uipc_mbuf.c Remove historical macro. 2014-01-16 13:42:50 +00:00
uipc_mqueue.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
uipc_sem.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
uipc_shm.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
uipc_sockbuf.c Fix PR kern/185813 "SOCK_SEQPACKET AF_UNIX sockets with asymmetrical 2014-03-06 20:24:15 +00:00
uipc_socket.c Simplify wait/nowait code, eventually killing last remnant of 2014-01-16 13:45:41 +00:00
uipc_syscalls.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
uipc_usrreq.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
vfs_acl.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
vfs_aio.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
vfs_bio.c Fix a typo. 2014-01-21 03:24:52 +00:00
vfs_cache.c Fix accounting for the negative cache entries when reusing v_cache_dd. 2013-12-27 17:09:59 +00:00
vfs_cluster.c When allocating a pbuf for the cluster write, do not sleep waiting 2013-08-27 01:31:12 +00:00
vfs_default.c - Convert the bufobj lock to rwlock. 2013-05-31 00:43:41 +00:00
vfs_export.c Further refine the handling of stop signals in the NFS client. The 2013-02-21 19:02:50 +00:00
vfs_extattr.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
vfs_hash.c Add exported vfs_hash_index() function, which calculates the canonical 2013-01-14 05:41:40 +00:00
vfs_init.c Revert accidental commit. 2013-06-29 05:05:57 +00:00
vfs_lookup.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
vfs_mount.c Change len checks for fstypelen and fspathlen to be against absolute len 2013-10-03 22:52:03 +00:00
vfs_mountroot.c In sys/kern/vfs_mountroot.c, remove static function parse_isspace(), 2013-12-25 22:14:42 +00:00
vfs_subr.c Do not flush buffers when the v_object of the passed vnode does not 2013-10-09 18:43:29 +00:00
vfs_syscalls.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
vfs_vnops.c change td_retval into a union w/ off_t, with defines to mask the 2014-03-16 00:53:40 +00:00
vnode_if.src If filesystem declares that it supports shared locking for writes, use 2013-11-09 20:36:29 +00:00