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Linux: Add ppoll fortify symbol for 64 bit time_t (BZ# 29746)

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Similar to ppoll, the poll.h header needs to redirect the poll call
to a proper fortified ppoll with 64 bit time_t support.

The implementation is straightforward, just need to add a similar
check as __poll_chk and call the 64 bit time_t ppoll version.  The
debug fortify tests are also extended to cover 64 bit time_t for
affected ABIs.

Unfortunately it requires an aditional symbol, which makes backport
tricky.  One possibility is to add a static inline version if compiler
supports is and call abort instead of __chk_fail, so fortified version
will call __poll64 in the end.

Another possibility is to just remove the fortify support for
_TIME_BITS=64.

Checked on i686-linux-gnu.
This commit is contained in:
Adhemerval Zanella
2022-11-04 16:02:52 -03:00
parent 19934d629e
commit 2e274cd8c1
25 changed files with 125 additions and 15 deletions
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3
sysdeps/unix/sysv/linux/ppoll.c
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@@ -67,7 +67,7 @@ __ppoll64 (struct pollfd *fds, nfds_t nfds, const struct __timespec64 *timeout,
libc_hidden_def (__ppoll64)
int
__ppoll (struct pollfd *fds, nfds_t nfds, const struct timespec *timeout,
ppoll (struct pollfd *fds, nfds_t nfds, const struct timespec *timeout,
const sigset_t *sigmask)
{
struct __timespec64 ts64;
@@ -77,5 +77,4 @@ __ppoll (struct pollfd *fds, nfds_t nfds, const struct timespec *timeout,
return __ppoll64 (fds, nfds, timeout ? &ts64 : NULL, sigmask);
}
#endif
strong_alias (__ppoll, ppoll)
libc_hidden_def (ppoll)