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opnsense-src/sys/kern
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Mark Johnston a9184e99af kthread: Set *newtdp earlier in kthread_add1() 
syzbot reported a single boot-time crash in g_event_procbody(), a page
fault when dereferencing g_event_td.  g_event_td is initialized by the
kproc_kthread_add() call which creates the GEOM event thread:

  kproc_kthread_add(g_event_procbody, NULL, &g_proc, &g_event_td,
      RFHIGHPID, 0, "geom", "g_event");

I believe that the caller of kproc_kthread_add() was preempted after
adding the new thread to the scheduler, and before setting *newtdp,
which is equal to g_event_td.  Thus, since the first action of the GEOM
event thread is to lock itself, it ended up dereferencing a NULL
pointer.

Fix the problem simply by initializing *newtdp earlier.  I see no harm
in that, and it matches kproc_create1().  The scheduler provides
sufficient synchronization to ensure that the store is visible to the
new thread, wherever it happens to run.

Reported by:	syzbot+5397f4d39219b85a9409@syzkaller.appspotmail.com
Reviewed by:	kib
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D42986

(cherry picked from commit ae77041e0714627f9ec8045ca9ee2b6ea563138e)
2023-12-17 21:20:13 -05:00
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bus_if.m sys: Remove $FreeBSD$: one-line sh pattern 2023-08-16 11:54:58 -06:00
clock_if.m sys: Remove $FreeBSD$: one-line sh pattern 2023-08-16 11:54:58 -06:00
cpufreq_if.m sys: Remove $FreeBSD$: one-line sh pattern 2023-08-16 11:54:58 -06:00
device_if.m sys: Remove $FreeBSD$: one-line sh pattern 2023-08-16 11:54:58 -06:00
firmw.S sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
genassym.sh sys: Remove $FreeBSD$: one-line sh pattern 2023-08-16 11:54:58 -06:00
genoffset.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
genoffset.sh sys: Remove $FreeBSD$: one-line sh pattern 2023-08-16 11:54:58 -06:00
imgact_aout.c sysentvec: add SV_SIGSYS flag 2023-10-09 06:24:31 +03:00
imgact_binmisc.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
imgact_elf.c auxv: make AT_BSDFLAGS unsigned 2023-12-02 00:03:25 +00:00
imgact_elf32.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
imgact_elf64.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
imgact_shell.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
init_main.c init_main: Record completed SYSINITs 2023-09-13 08:47:36 -07:00
init_sysent.c timerfd: Move implementation from linux compat to sys/kern 2023-08-24 14:28:56 -06:00
kern_acct.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_alq.c alq, siftr: add panic/debugger checks to shutdown hooks 2023-12-08 18:02:44 -04:00
kern_boottrace.c boottrace: Add corresponding sysctl knob for loader tunable 2023-10-19 22:00:50 +08:00
kern_clock.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_clocksource.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_condvar.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_conf.c Giant: Postpone removal of Giant-locked drivers until 15 2023-11-02 00:22:22 +08:00
kern_cons.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_context.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_cpu.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_cpuset.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_ctf.c sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
kern_descrip.c fd: Add sysctl flag CTLFLAG_TUN to loader tunables 2023-10-12 12:08:19 +08:00
kern_devctl.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_dtrace.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_dump.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
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kern_et.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_event.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_exec.c Add membarrier(2) 2023-08-23 03:02:21 +03:00
kern_exit.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_fail.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_ffclock.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_fork.c EVFILT_TIMER: intialize stop timer list in type-stable proc init, instead of fork 2023-12-05 02:43:27 +02:00
kern_hhook.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
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kern_intr.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_jail.c cr_canseejailproc(): New privilege, no direct check for UID 0 2023-10-17 16:42:58 -03:00
kern_kcov.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_khelp.c khelp: suppress useless warning message on shutdown 2023-11-24 12:11:16 -06:00
kern_kthread.c kthread: Set *newtdp earlier in kthread_add1() 2023-12-17 21:20:13 -05:00
kern_ktr.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
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kern_malloc.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_mbuf.c mbuf: Add sysctl flag CTLFLAG_TUN to loader tunables 2023-10-12 12:08:19 +08:00
kern_membarrier.c Add membarrier(2) 2023-08-23 03:02:21 +03:00
kern_mib.c sysctl kern.supported_archs: return correct value 2023-11-28 13:39:38 +02:00
kern_module.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_mtxpool.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
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kern_ntptime.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_osd.c kern: osd: stop downsizing arrays when the last slot deregisters 2023-08-17 23:06:12 -05:00
kern_physio.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_pmc.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
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kern_priv.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_proc.c EVFILT_TIMER: intialize stop timer list in type-stable proc init, instead of fork 2023-12-05 02:43:27 +02:00
kern_procctl.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_prot.c Make cr_bsd_visible()'s sub-functions internal 2023-10-18 13:24:48 -03:00
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kern_shutdown.c kern_reboot(): don't clear kdb_active 2023-12-08 18:02:45 -04:00
kern_sig.c EVFILT_SIGNAL: do not use target process pointer on detach 2023-12-05 02:43:27 +02:00
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kern_synch.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_syscalls.c syscalls: fix missing SIGSYS for several ENOSYS errors 2023-10-09 06:24:31 +03:00
kern_sysctl.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_tc.c timerfd: Move implementation from linux compat to sys/kern 2023-08-24 14:28:56 -06:00
kern_thr.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_thread.c Ensure 'struct thread' is aligned to a cache line 2023-11-16 10:07:30 -05:00
kern_time.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_timeout.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
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kern_uuid.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
kern_vnodedumper.c kerneldump: Inline dump_savectx() into its callers 2023-03-20 14:16:28 -04:00
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Makefile makesyscalls: don't make syscall.mk by default 2023-12-13 23:07:06 +00:00
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subr_asan.c kasan: Add corresponding sysctl knob for loader tunable 2023-10-19 22:00:56 +08:00
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subr_busdma_bounce.c spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD 2023-05-12 10:44:03 -06:00
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subr_memdesc.c memdesc: Add routines for copying data to/from memory descriptors 2023-07-31 13:24:44 -07:00
subr_module.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
subr_msan.c kmsan: Add kmsan_check_uio() 2023-12-14 09:44:38 -05:00
subr_msgbuf.c sys: Remove $FreeBSD$: two-line .h pattern 2023-08-16 11:54:11 -06:00
subr_param.c arm64: do not disable the kern.kstack_pages tunable on arm64 2023-10-20 18:55:45 +03:00
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subr_pctrie.c pctrie: change for vm_radix compatibility 2023-08-21 12:28:51 -05:00
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subr_sbuf.c Remove my middle name. 2023-08-17 15:08:30 +02:00
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subr_syscall.c syscalls: fix missing SIGSYS for several ENOSYS errors 2023-10-09 06:24:31 +03:00
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subr_uio.c uiomove: Add some assertions 2023-10-24 09:19:01 -04:00
subr_unit.c subr_unit.c: another attempt to fix the build 2023-08-18 19:28:42 +03:00
subr_vmem.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
subr_witness.c witness: Unconditionally initialize out-params for witness_save() 2023-10-24 09:20:55 -04:00
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sys_process.c Support dynamically sized register sets 2023-08-23 15:32:56 +01:00
sys_socket.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
sys_timerfd.c timerfd: Relocate 32-bit compat code 2023-09-17 09:01:59 -06:00
syscalls.c timerfd: Move implementation from linux compat to sys/kern 2023-08-24 14:28:56 -06:00
syscalls.conf makesyscalls: don't make syscall.mk by default 2023-12-13 23:07:06 +00:00
syscalls.master syscalls.master: Fix SAL annotation for getdirentires basep argument 2023-09-29 08:26:00 -04:00
systrace_args.c timerfd: Move implementation from linux compat to sys/kern 2023-08-24 14:28:56 -06:00
sysv_ipc.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
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tty.c tty: Avoid a kernel memory discloure via kern.ttys 2023-12-14 09:29:15 -05:00
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tty_ttydisc.c tty: properly check character position when handling IUTF8 backspaces 2023-11-20 18:54:54 +02:00
uipc_accf.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
uipc_debug.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
uipc_domain.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
uipc_ktls.c ktls: Remove unneeded vm/uma_dbg.h include 2023-11-23 10:48:08 -05:00
uipc_mbuf.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
uipc_mbuf2.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
uipc_mbufhash.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
uipc_mqueue.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
uipc_sem.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
uipc_shm.c shmfd: hide direct rangelock(9) use under a wrapper 2023-09-15 22:41:39 +03:00
uipc_sockbuf.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
uipc_socket.c sockets: Add sysctl flag CTLFLAG_TUN to loader tunable 2023-10-12 12:08:19 +08:00
uipc_syscalls.c ktrace: Handle uio_resid underflow via MSG_TRUNC 2023-10-20 12:02:05 -04:00
uipc_usrreq.c unix: Fix a lock order reveral 2023-10-04 09:41:38 -04:00
vfs_acl.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
vfs_aio.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
vfs_bio.c buf: Add sysctl flag CTLFLAG_TUN to loader tunable 2023-10-12 12:08:20 +08:00
vfs_cache.c vfs cache: Fallback to namei to resolve symlinks with leading / in target for non-native ABI 2023-10-22 09:55:53 +03:00
vfs_cluster.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
vfs_default.c VFS: add VOP_GETLOWVNODE() 2023-12-05 02:43:27 +02:00
vfs_export.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
vfs_extattr.c Move kern_extattr_* prototypes to <sys/syscallsubr.h> 2023-10-24 10:00:57 -07:00
vfs_hash.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
vfs_init.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
vfs_lookup.c vfs_lookup_cross_mount(): restore previous do...while loop 2023-11-11 20:38:26 -06:00
vfs_mount.c nfsd: Fix NFS access to .zfs/snapshot snapshots 2023-11-25 16:53:29 -08:00
vfs_mountroot.c sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
vfs_subr.c vfs: convert recycles_count and recycles_free_count to mere u_long 2023-10-13 23:41:48 +00:00
vfs_syscalls.c copy_file_range: require CAP_SEEK capability 2023-10-02 10:16:24 +02:00
vfs_vnops.c vn_copy_file_range(): provide ENOSYS fallback to vn_generic_copy_file_range() 2023-12-05 02:43:27 +02:00
vnode_if.src VFS: add VOP_GETLOWVNODE() 2023-12-05 02:43:27 +02:00