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linux-user: Fix errno for sendrecvmsg with large iovec length 

The sendmsg and recvmsg syscalls use a different errno to indicate
an overlarge iovec length from readv and writev. Handle this
special case in do_sendrcvmsg_locked() to avoid getting the
default errno returned by lock_iovec().

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Peter Maydell 2016-07-15 14:57:27 +01:00 committed by Riku Voipio
parent dab32b321f
commit 97b0797033
1 changed files with 9 additions and 0 deletions
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9
linux-user/syscall.c
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@ -3485,6 +3485,15 @@ static abi_long do_sendrecvmsg_locked(int fd, struct target_msghdr *msgp,
count = tswapal(msgp->msg_iovlen);
target_vec = tswapal(msgp->msg_iov);
if (count > IOV_MAX) {
/* sendrcvmsg returns a different errno for this condition than
* readv/writev, so we must catch it here before lock_iovec() does.
*/
ret = -TARGET_EMSGSIZE;
goto out2;
}
vec = lock_iovec(send ? VERIFY_READ : VERIFY_WRITE,
target_vec, count, send);
if (vec == NULL) {