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| author | Rich Felker <dalias@aerifal.cx> | 2019-03-05 11:02:15 -0500 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2019-03-05 11:08:46 -0500 |
| commit | 4918b7fb0d9f3d3fd4b46be3313901fbd772064b (patch) | |
| tree | 9559680400635982c454e54a648d2627758dae04 /src/signal | |
| parent | 43e7efb46555f13a556d92944ac05c19b8929b60 (diff) | |
| download | musl-4918b7fb0d9f3d3fd4b46be3313901fbd772064b.tar.gz | |
don't reject unknown/future flags in sigaltstack, allow SS_AUTODISARM
historically, and likely accidentally, sigaltstack was specified to
fail with EINVAL if any flag bit other than SS_DISABLE was set. the
resolution of Austin Group issue 1187 fixes this so that the
requirement is only to fail for SS_ONSTACK (which cannot be set) or
"invalid" flags.
Linux fails on the kernel side for invalid flags, but historically
accepts SS_ONSTACK as a no-op, so it needs to be rejected in userspace
still.
with this change, the Linux-specific SS_AUTODISARM, provided since
commit 9680e1d03a794b0e0d5815c749478228ed40a36d but unusable due to
rejection at runtime, is now usable.
Diffstat (limited to 'src/signal')
| -rw-r--r-- | src/signal/sigaltstack.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/signal/sigaltstack.c b/src/signal/sigaltstack.c index 62cb81ad..cfa3f5c1 100644 --- a/src/signal/sigaltstack.c +++ b/src/signal/sigaltstack.c @@ -9,7 +9,7 @@ int sigaltstack(const stack_t *restrict ss, stack_t *restrict old) errno = ENOMEM; return -1; } - if (ss->ss_flags & ~SS_DISABLE) { + if (ss->ss_flags & SS_ONSTACK) { errno = EINVAL; return -1; } |