[PATCH] capability: Fix bug in checking capabilties in ptrace system call

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

 



This patch fixes a bug of ptrace for PTRACE_TRACEME request. In this
case the call is made by the child process & code needs to check the
capabilty of the parent process to trace the child process but code
incorrectly makes check for the child process.

Signed-off-by: Ram Gupta <[email protected]>

--- linux-2.6.14-patch-2.6.15/security/commoncap.c.orig Wed Mar  8 13:54:06 2006
+++ linux-2.6.14-patch-2.6.15/security/commoncap.c      Wed Mar  8 13:57:07 2006
@@ -59,9 +59,13 @@ int cap_settime(struct timespec *ts, str
 int cap_ptrace (struct task_struct *parent, struct task_struct *child)
 {
        /* Derived from arch/i386/kernel/ptrace.c:sys_ptrace. */
-       if (!cap_issubset (child->cap_permitted, current->cap_permitted) &&
-           !capable(CAP_SYS_PTRACE))
-               return -EPERM;
+       if (!cap_issubset (child->cap_permitted, current->cap_permitted)){
+               if(!security_ops->capable(parent,CAP_SYS_PTRACE)){
+                       parent->flags |= PF_SUPERPRIV;
+               }
+               else
+                       return -EPERM;
+       }
        return 0;
 }

Regards
Ram Gupta
-
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