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don't reject unknown/future flags in sigaltstack, allow SS_AUTODISARM

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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.
This commit is contained in:
Rich Felker 2019-03-05 11:02:15 -05:00
parent 43e7efb465
commit 4918b7fb0d
1 changed files with 1 additions and 1 deletions
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2
src/signal/sigaltstack.c
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@ -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;
}