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[libc] Fix sendmsg iovec unpoisoning (#115057)

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The unpoisoning for sendmsg had a typo where it would not unpoison all
of the elements in the iovec, causing msan errors. This patch fixes
that.
This commit is contained in:
Michael Jones
2024-11-05 13:34:57 -08:00
committed by GitHub
parent 97262afa6d
commit fedb9fdb98
1 changed files with 4 additions and 3 deletions
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7
libc/src/sys/socket/linux/recvmsg.cpp
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@@ -20,8 +20,7 @@
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(ssize_t, recvmsg,
(int sockfd, struct msghdr *msg, int flags)) {
LLVM_LIBC_FUNCTION(ssize_t, recvmsg, (int sockfd, msghdr *msg, int flags)) {
#ifdef SYS_recvmsg
ssize_t ret =
LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_recvmsg, sockfd, msg, flags);
@@ -40,9 +39,11 @@ LLVM_LIBC_FUNCTION(ssize_t, recvmsg,
}
// Unpoison the msghdr, as well as all its components.
MSAN_UNPOISON(msg, sizeof(msghdr));
MSAN_UNPOISON(msg->msg_name, msg->msg_namelen);
for (size_t i = 0; i < msg->msg_iovlen; ++i) {
MSAN_UNPOISON(msg->msg_iov->iov_base, msg->msg_iov->iov_len);
MSAN_UNPOISON(msg->msg_iov[i].iov_base, msg->msg_iov[i].iov_len);
}
MSAN_UNPOISON(msg->msg_control, msg->msg_controllen);