[lkml]   [2014]   [Oct]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH 1/3] tools: hv: fcopy_daemon: Check buffer limits
From: Matej Mužila <>

Check if cpmsg->size is in limits of DATA_FRAGMENT

Signed-off-by: Matej Mužila <>
Acked-by: K. Y. Srinivasan <>
If corrupted data are read from /dev/vmbus/hv_fcopy, pwrite can
read from memory outside of the buffer (defined at line 138).
Added check.
@@ -104,6 +104,10 @@ static int hv_copy_data(struct hv_do_fcopy *cpmsg)
ssize_t bytes_written;

+ // Check if the cpmsg->size is in limits of DATA_FRAGMENT
+ if (cpmsg->size > DATA_FRAGMENT * sizeof(__u8))
+ return HV_E_FAIL;
bytes_written = pwrite(target_fd, cpmsg->data, cpmsg->size,

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at
 \ /
  Last update: 2014-10-21 14:01    [W:0.064 / U:3.172 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site