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malloc: Do not clobber errno on __getrandom_nocancel (BZ #29624)

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Use INTERNAL_SYSCALL_CALL instead of INLINE_SYSCALL_CALL.  This
requires emulate the semantic for hurd call (so __arc4random_buf
uses the fallback).

Checked on x86_64-linux-gnu.

Reviewed-by: Wilco Dijkstra  <Wilco.Dijkstra@arm.com>
This commit is contained in:
Adhemerval Zanella 2022-09-29 16:18:06 -03:00
parent 13db9ee2cb
commit 609c9d0951
3 changed files with 12 additions and 4 deletions
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2
stdlib/arc4random.c
View File

@ -51,7 +51,7 @@ __arc4random_buf (void *p, size_t n)
n -= l;
continue; /* Interrupted by a signal; keep going. */
}
else if (l < 0 && errno == ENOSYS)
else if (l == -ENOSYS)
break; /* No syscall, so fallback to /dev/urandom. */
arc4random_getrandom_failure ();
}

12
sysdeps/mach/hurd/not-cancel.h
View File

@ -25,6 +25,7 @@
#include <sys/wait.h>
#include <time.h>
#include <sys/uio.h>
#include <sys/random.h>
#include <hurd.h>
#include <hurd/fd.h>
@ -75,8 +76,15 @@ __typeof (__fcntl) __fcntl_nocancel;
#define __fcntl64_nocancel(...) \
__fcntl_nocancel (__VA_ARGS__)
#define __getrandom_nocancel(buf, size, flags) \
__getrandom (buf, size, flags)
static inline ssize_t
__getrandom_nocancel (void *buf, size_t buflen, unsigned int flags)
{
int save_errno = errno;
ssize_t r = __getrandom (buf, buflen, flags);
r = r == -1 ? -errno : r;
__set_errno (save_errno);
return r;
}
#define __poll_infinity_nocancel(fds, nfds) \
__poll (fds, nfds, -1)

2
sysdeps/unix/sysv/linux/not-cancel.h
View File

@ -71,7 +71,7 @@ __writev_nocancel_nostatus (int fd, const struct iovec *iov, int iovcnt)
static inline ssize_t
__getrandom_nocancel (void *buf, size_t buflen, unsigned int flags)
{
return INLINE_SYSCALL_CALL (getrandom, buf, buflen, flags);
return INTERNAL_SYSCALL_CALL (getrandom, buf, buflen, flags);
}
static inline int