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| author | Eric W. Biederman <ebiederm@xmission.com> | 2021-10-20 20:43:59 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-25 11:49:06 +0300 |
| commit | 110ae07d2268b176c470d3b26eaddd3c5f1b157b (patch) | |
| tree | 6977523b3afca00d91ed1e799d751c8555c286d9 /include | |
| parent | 21d727a394f01525f26603f1ca8db7a0e77b69f6 (diff) | |
| download | linux-110ae07d2268b176c470d3b26eaddd3c5f1b157b.tar.xz | |
signal: Implement force_fatal_sig
commit 26d5badbccddcc063dc5174a2baffd13a23322aa upstream.
Add a simple helper force_fatal_sig that causes a signal to be
delivered to a process as if the signal handler was set to SIG_DFL.
Reimplement force_sigsegv based upon this new helper. This fixes
force_sigsegv so that when it forces the default signal handler
to be used the code now forces the signal to be unblocked as well.
Reusing the tested logic in force_sig_info_to_task that was built for
force_sig_seccomp this makes the implementation trivial.
This is interesting both because it makes force_sigsegv simpler and
because there are a couple of buggy places in the kernel that call
do_exit(SIGILL) or do_exit(SIGSYS) because there is no straight
forward way today for those places to simply force the exit of a
process with the chosen signal. Creating force_fatal_sig allows
those places to be implemented with normal signal exits.
Link: https://lkml.kernel.org/r/20211020174406.17889-13-ebiederm@xmission.com
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Thomas Backlund <tmb@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/sched/signal.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h index e5f4ce622ee6..e2dc9f119ada 100644 --- a/include/linux/sched/signal.h +++ b/include/linux/sched/signal.h @@ -338,6 +338,7 @@ extern int kill_pid(struct pid *pid, int sig, int priv); extern __must_check bool do_notify_parent(struct task_struct *, int); extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); extern void force_sig(int); +extern void force_fatal_sig(int); extern int send_sig(int, struct task_struct *, int); extern int zap_other_threads(struct task_struct *p); extern struct sigqueue *sigqueue_alloc(void); |