From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: libc-alpha@sourceware.org,
Wilco Dijkstra <Wilco.Dijkstra@arm.com>,
Yu Chien Peter Lin <peterlin@andestech.com>
Subject: [PATCH v2] malloc: Do not clobber errno on __getrandom_nocancel (BZ#29624)
Date: Thu, 29 Sep 2022 14:55:26 -0300 [thread overview]
Message-ID: <20220929175526.2596756-1-adhemerval.zanella@linaro.org> (raw)
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.
---
stdlib/arc4random.c | 4 ++--
sysdeps/mach/hurd/not-cancel.h | 12 ++++++++++--
sysdeps/unix/sysv/linux/not-cancel.h | 2 +-
3 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/stdlib/arc4random.c b/stdlib/arc4random.c
index e417ef624d..0a1f4b8a57 100644
--- a/stdlib/arc4random.c
+++ b/stdlib/arc4random.c
@@ -34,7 +34,7 @@ void
__arc4random_buf (void *p, size_t n)
{
static int seen_initialized;
- size_t l;
+ int l;
int fd;
if (n == 0)
@@ -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..518f738519 100644
--- a/sysdeps/mach/hurd/not-cancel.h
+++ b/sysdeps/mach/hurd/not-cancel.h
@@ -27,6 +27,7 @@
#include <sys/uio.h>
#include <hurd.h>
#include <hurd/fd.h>
+#include <sys/random.h>
/* Non cancellable close syscall. */
__typeof (__close) __close_nocancel;
@@ -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 int
+__getrandom_nocancel (void *buf, size_t buflen, unsigned int flags)
+{
+ int save_errno = errno;
+ int 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 a263d294b1..00ab75a405 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 int
__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
--
2.34.1
next reply other threads:[~2022-09-29 17:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-29 17:55 Adhemerval Zanella [this message]
2022-09-29 18:36 ` Wilco Dijkstra
2022-09-29 19:07 ` Adhemerval Zanella Netto
2022-09-29 19:36 ` H.J. Lu
2022-09-29 18:44 ` Yann Droneaud
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