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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2022-09-29 16:18:06 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2022-09-30 15:25:15 -0300 |
| commit | 609c9d0951da387cd523b5db42a82d38dabc37c4 (patch) | |
| tree | a9f4e664f78c4d4870d479db5ef467519d015137 | |
| parent | 13db9ee2cb3b77e25f852be7d6952882e1be6f00 (diff) | |
| download | glibc-609c9d0951da387cd523b5db42a82d38dabc37c4.tar glibc-609c9d0951da387cd523b5db42a82d38dabc37c4.tar.gz glibc-609c9d0951da387cd523b5db42a82d38dabc37c4.tar.bz2 glibc-609c9d0951da387cd523b5db42a82d38dabc37c4.zip | |
malloc: Do not clobber errno on __getrandom_nocancel (BZ #29624)
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>
| -rw-r--r-- | stdlib/arc4random.c | 2 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/not-cancel.h | 12 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/not-cancel.h | 2 |
3 files changed, 12 insertions, 4 deletions
diff --git a/stdlib/arc4random.c b/stdlib/arc4random.c index 960a38f295..c126c601bf 100644 --- a/stdlib/arc4random.c +++ b/stdlib/arc4random.c @@ -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 (); } diff --git a/sysdeps/mach/hurd/not-cancel.h b/sysdeps/mach/hurd/not-cancel.h index ae58b734e3..e2edfb1cf3 100644 --- a/sysdeps/mach/hurd/not-cancel.h +++ b/sysdeps/mach/hurd/not-cancel.h @@ -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) diff --git a/sysdeps/unix/sysv/linux/not-cancel.h b/sysdeps/unix/sysv/linux/not-cancel.h index cf35c8bfc9..93615de681 100644 --- a/sysdeps/unix/sysv/linux/not-cancel.h +++ b/sysdeps/unix/sysv/linux/not-cancel.h @@ -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 |