[compiler-rt] 3fc723e - [compiler-rt][sanitizer] fix msghdr for musl (#136195)

[via llvm-commits]

Author: Deák Lajos
Date: 2025-07-22T11:31:28-07:00
New Revision: 3fc723ec2cf1965aa4eec8883957fbbe1b2e7027

URL: https://github.com/llvm/llvm-project/commit/3fc723ec2cf1965aa4eec8883957fbbe1b2e7027
DIFF: https://github.com/llvm/llvm-project/commit/3fc723ec2cf1965aa4eec8883957fbbe1b2e7027.diff

LOG: [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`.

Added: 
    

Modified: 
    compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h

Removed: 
    


################################################################################
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 0d1273821d655..00e237a24fc91 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.