https://github.com/deaklajos created
https://github.com/llvm/llvm-project/pull/159551
Backports: 3fc723ec2cf1965aa4eec8883957fbbe1b2e7027 (#136195)
Ran into the issue on Alpine when building with TSAN that `__sanitizer_msghdr`
and the `msghdr` provided by musl did not match. This caused lots of tsan
reports and an eventual termination of the application by the oom during a
`sendmsg`.
From 60b10f56319e62415c61e69c67f9c713ed81172e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?De=C3=A1k=20Lajos?=
<36414743+deakla...@users.noreply.github.com>
Date: Tue, 22 Jul 2025 20:31:28 +0200
Subject: [PATCH] [compiler-rt][sanitizer] fix msghdr for musl (#136195)
Ran into the issue on Alpine when building with TSAN that
`__sanitizer_msghdr` and the `msghdr` provided by musl did not match.
This caused lots of tsan reports and an eventual termination of the
application by the oom during a `sendmsg`.
---
.../sanitizer_platform_limits_posix.h | 24 +++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h
b/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h
index f118d53f0df80..24966523f3a02 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h
@@ -478,6 +478,30 @@ struct __sanitizer_cmsghdr {
int cmsg_level;
int cmsg_type;
};
+# elif SANITIZER_MUSL
+struct __sanitizer_msghdr {
+ void *msg_name;
+ unsigned msg_namelen;
+ struct __sanitizer_iovec *msg_iov;
+ int msg_iovlen;
+# if SANITIZER_WORDSIZE == 64
+ int __pad1;
+# endif
+ void *msg_control;
+ unsigned msg_controllen;
+# if SANITIZER_WORDSIZE == 64
+ int __pad2;
+# endif
+ int msg_flags;
+};
+struct __sanitizer_cmsghdr {
+ unsigned cmsg_len;
+# if SANITIZER_WORDSIZE == 64
+ int __pad1;
+# endif
+ int cmsg_level;
+ int cmsg_type;
+};
# else
// In POSIX, int msg_iovlen; socklen_t msg_controllen; socklen_t cmsg_len; but
// many implementations don't conform to the standard.
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