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linux-user: Detect Negative Message Sizes in msgsnd System Call 

The msgsnd system call takes an argument that describes the message
size (msgsz) and is of type size_t.  The system call should set
errno to EINVAL in the event that a negative message size is passed.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Tom Musta 2014-08-12 13:53:37 -05:00 committed by Riku Voipio
parent b6ce1f6b90
commit edcc5f9dc3
1 changed files with 5 additions and 1 deletions
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6
linux-user/syscall.c
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@ -2879,12 +2879,16 @@ struct target_msgbuf {
};
static inline abi_long do_msgsnd(int msqid, abi_long msgp,
unsigned int msgsz, int msgflg)
ssize_t msgsz, int msgflg)
{
struct target_msgbuf *target_mb;
struct msgbuf *host_mb;
abi_long ret = 0;
if (msgsz < 0) {
return -TARGET_EINVAL;
}
if (!lock_user_struct(VERIFY_READ, target_mb, msgp, 0))
return -TARGET_EFAULT;
host_mb = malloc(msgsz+sizeof(long));