[PATCH] security: fix capability bug

["Ram Gupta" <ram.gupta5@gmail.com>]

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. Please apply

Signed-off-by: Ram Gupta <ram.gupta5@gmail.com>
----
-- linux-2.6.15.6-rg/security/commoncap.c.orig 2006-03-10
13:22:26.000000000 +0000
+++ linux-2.6.15.6-rg/security/commoncap.c      2006-03-10
13:26:45.000000000 +0000
@@ -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, parent->cap_permitted)){
+               if(!cap_capable(parent,CAP_SYS_PTRACE)){
+                       parent->flags |= PF_SUPERPRIV;
+               }
+               else
+                       return -EPERM;
+       }
        return 0;
 }

regards
Ram Gupta
-
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