[PATCH] race condition in procfs

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hello,

I found a race condition in procfs on SMP systems. The result is an
oops in processes like pidof. Apparently ->proc_read() gets passed a
potentially NULL pointer. The following micro-patch seems to fix it.

Best regards,
 Grzegorz Nosek

--- linux-2.6/fs/proc/base.c.orig 2005-11-25 00:07:43.000000000 +0100
+++ linux-2.6/fs/proc/base.c      2005-11-28 11:44:11.000000000 +0100
@@ -718,6 +718,9 @@
       ssize_t length;
       struct task_struct *task = proc_task(inode);

+       if (!task)
+               return -ENOENT;
+
       if (count > PROC_BLOCK_SIZE)
               count = PROC_BLOCK_SIZE;
       if (!(page = __get_free_page(GFP_KERNEL)))
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux