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authorKees Cook <keescook@chromium.org>2017-02-07 15:18:51 -0800
committerJames Morris <james.l.morris@oracle.com>2017-02-23 09:42:35 +1100
commitd7276e321ff8a53106a59c85ca46d03e34288893 (patch)
treee3b752b1b1a94ff0794e29e5658dfd48dd9b7d4d /kernel/seccomp.c
parent37c85961c3f87f2141c84e53df31e59db072fd2e (diff)
downloadlinux-stericsson-d7276e321ff8a53106a59c85ca46d03e34288893.tar.gz
seccomp: Only dump core when single-threaded
The SECCOMP_RET_KILL filter return code has always killed the current thread, not the entire process. Changing this as a side-effect of dumping core isn't a safe thing to do (a few test suites have already flagged this behavioral change). Instead, restore the RET_KILL semantics, but still dump core when a RET_KILL delivers SIGSYS to a single-threaded process. Fixes: b25e67161c29 ("seccomp: dump core when using SECCOMP_RET_KILL") Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: Andrei Vagin <avagin@virtuozzo.com> Signed-off-by: James Morris <james.l.morris@oracle.com>
Diffstat (limited to 'kernel/seccomp.c')
-rw-r--r--kernel/seccomp.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index f8f88ebcb3ba..e15185c28de5 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -643,11 +643,14 @@ static int __seccomp_filter(int this_syscall, const struct seccomp_data *sd,
default: {
siginfo_t info;
audit_seccomp(this_syscall, SIGSYS, action);
- /* Show the original registers in the dump. */
- syscall_rollback(current, task_pt_regs(current));
- /* Trigger a manual coredump since do_exit skips it. */
- seccomp_init_siginfo(&info, this_syscall, data);
- do_coredump(&info);
+ /* Dump core only if this is the last remaining thread. */
+ if (get_nr_threads(current) == 1) {
+ /* Show the original registers in the dump. */
+ syscall_rollback(current, task_pt_regs(current));
+ /* Trigger a manual coredump since do_exit skips it. */
+ seccomp_init_siginfo(&info, this_syscall, data);
+ do_coredump(&info);
+ }
do_exit(SIGSYS);
}
}