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authorEric W. Biederman <ebiederm@xmission.com>2021-10-20 12:43:59 -0500
committerEric W. Biederman <ebiederm@xmission.com>2021-10-29 14:31:33 -0500
commit26d5badbccddcc063dc5174a2baffd13a23322aa (patch)
treef4c857586c99298119049ae57b32aa69394ec621 /include/linux/sched
parent111e70490d2a673730b89c010b61cea2d982d121 (diff)
signal: Implement force_fatal_sig
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>
Diffstat (limited to 'include/linux/sched')
-rw-r--r--include/linux/sched/signal.h1
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);