diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-10-08 11:13:17 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-10-08 11:13:17 -0300 |
| commit | 47e7dd34a26def31af352df3a8281e7ff1bc345a (patch) | |
| tree | f8cbd86ce126d65f79bca2ceefbaea6130923e1b /kernel/rseq.c | |
| parent | perf srcline: Use long-running addr2line per DSO (diff) | |
| parent | Merge tag 'nfsd-5.15-3' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/... (diff) | |
| download | linux-47e7dd34a26def31af352df3a8281e7ff1bc345a.tar.gz linux-47e7dd34a26def31af352df3a8281e7ff1bc345a.zip | |
Merge remote-tracking branch 'torvalds/master' into perf/core
To pick up the fixes in perf/urgent that were just merged into upstream.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'kernel/rseq.c')
| -rw-r--r-- | kernel/rseq.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/kernel/rseq.c b/kernel/rseq.c index 35f7bd0fced0..6d45ac3dae7f 100644 --- a/kernel/rseq.c +++ b/kernel/rseq.c @@ -282,9 +282,17 @@ void __rseq_handle_notify_resume(struct ksignal *ksig, struct pt_regs *regs) if (unlikely(t->flags & PF_EXITING)) return; - ret = rseq_ip_fixup(regs); - if (unlikely(ret < 0)) - goto error; + + /* + * regs is NULL if and only if the caller is in a syscall path. Skip + * fixup and leave rseq_cs as is so that rseq_sycall() will detect and + * kill a misbehaving userspace on debug kernels. + */ + if (regs) { + ret = rseq_ip_fixup(regs); + if (unlikely(ret < 0)) + goto error; + } if (unlikely(rseq_update_cpu_id(t))) goto error; return; |