From: Yu Chien Peter Lin <peterlin@andestech.com>
To: <libc-alpha@sourceware.org>
Cc: <alankao@andestech.com>, <ycliang@andestech.com>,
Yu Chien Peter Lin <peterlin@andestech.com>
Subject: [PATCH] malloc: Fix clobbered errno when getrandom failed [BZ #29624]
Date: Thu, 29 Sep 2022 16:33:52 +0800 [thread overview]
Message-ID: <20220929083352.11890-1-peterlin@andestech.com> (raw)
The patch resets errno when getrandom syscall failed, which will
result in errno clobbered at statically linked program startup. This
scenario is possible if getrandom is called by tcache_key_initialize
when crng is not ready thus EAGAIN is returned.
Fixes bug 29624.
Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
---
malloc/malloc.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/malloc/malloc.c b/malloc/malloc.c
index 953183e956..21f2bf5431 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -3140,6 +3140,7 @@ tcache_key_initialize (void)
#if __WORDSIZE == 64
tcache_key = (tcache_key << 32) | random_bits ();
#endif
+ __set_errno(0);
}
}
--
2.34.1
next reply other threads:[~2022-09-29 8:34 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-29 8:33 Yu Chien Peter Lin [this message]
2022-09-29 10:00 ` Florian Weimer
2022-09-29 12:42 Wilco Dijkstra
2022-09-29 13:25 ` Adhemerval Zanella Netto
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