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authorCorinna Vinschen <corinna@vinschen.de>2024-01-29 13:38:14 +0100
committerCorinna Vinschen <corinna@vinschen.de>2024-01-29 13:43:36 +0100
commit030a762535c1e18bf5a7ecc73b0f49898a30b157 (patch)
treecaeec5cc844e49ade92921af5eeb328f5ce1420c
parent1f68e88f0dfdac54d71ed0fd2c3f9a9f65636e06 (diff)
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Cygwin: fix arc4random after fork(2)
After using fork(), arc4random does not reseed itself, which causes the results to become predictable. Activate droppingfork-recognition Fixes: e0fc33322d50 ("Delete Cygwin's arc4random in favor of new Newlib implementation") Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
-rw-r--r--winsup/cygwin/include/machine/_arc4random.h11
-rw-r--r--winsup/cygwin/release/3.5.06
2 files changed, 17 insertions, 0 deletions
diff --git a/winsup/cygwin/include/machine/_arc4random.h b/winsup/cygwin/include/machine/_arc4random.h
index 2078c35..fd3970f 100644
--- a/winsup/cygwin/include/machine/_arc4random.h
+++ b/winsup/cygwin/include/machine/_arc4random.h
@@ -25,4 +25,15 @@ extern int __isthreaded;
__lock_release (_arc4random_mutex); \
} while (0)
+static inline void
+_arc4random_forkdetect(void)
+{
+ extern int __in_forkee;
+
+ if (__in_forkee)
+ rs = NULL;
+}
+#define _ARC4RANDOM_FORKDETECT() _arc4random_forkdetect ()
+
+__END_DECLS
#endif /* _MACHINE_ARC4RANDOM_H */
diff --git a/winsup/cygwin/release/3.5.0 b/winsup/cygwin/release/3.5.0
index 611636b..d756c07 100644
--- a/winsup/cygwin/release/3.5.0
+++ b/winsup/cygwin/release/3.5.0
@@ -67,3 +67,9 @@ What changed:
- The default RLIMIT_CORE is now 0, disabling the generation of core dump or
stackdump files.
+
+Fixes:
+------
+
+- Fix arc4random reseeding after fork(2).
+ Addresses: https://cygwin.com/pipermail/cygwin/2024-January/255245.html