musl - musl - an implementation of the standard library for Linux-based systems

musl - an implementation of the standard library for Linux-based systems

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author	Rich Felker <dalias@aerifal.cx>	2019年03月05日 11:02:15 -0500
committer	Rich Felker <dalias@aerifal.cx>	2019年03月05日 11:08:46 -0500
commit	4918b7fb0d9f3d3fd4b46be3313901fbd772064b (patch)
tree	9559680400635982c454e54a648d2627758dae04 /src/signal/sigaltstack.c
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/sigaltstack.c')

-rw-r--r--

src/signal/sigaltstack.c

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;

}

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