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[PULL,16/24] linux-user: Detect Negative Message Sizes in msgsnd System Call

Message ID 989c10af553dbdb9ec7054c75e4cc5bcde015d3d.1408100160.git.riku.voipio@linaro.org
State New
Headers show

Commit Message

Riku Voipio Aug. 15, 2014, 11:01 a.m. UTC 
From: Tom Musta <tommusta@gmail.com>

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>
---
 linux-user/syscall.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
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Patch

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index c9a9d3d..d223cff 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -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));