>From 5bff8967f45a35f858b96ca673d9bf98eac53d49 Mon Sep 17 00:00:00 2001
From: Serge E. Hallyn <[email protected]>
Date: Wed, 31 Oct 2007 11:22:04 -0500
Subject: [PATCH 1/1] file capabilities: allow sigcont within session (v2)
(This is a proposed fix to http://bugzilla.kernel.org/show_bug.cgi?id=9247)
Allow sigcont to be sent to a process with greater capabilities
if it is in the same session. Otherwise, a shell from which
I've started a root shell and done 'suspend' can't be restarted
by the parent shell.
Also don't do file-capabilities signaling checks when uids for
the processes don't match, since the standard check_kill_permission
will have done those checks.
Signed-off-by: Serge E. Hallyn <[email protected]>
---
security/commoncap.c | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/security/commoncap.c b/security/commoncap.c
index bf67871..4de6857 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -526,6 +526,15 @@ int cap_task_kill(struct task_struct *p, struct siginfo *info,
if (info != SEND_SIG_NOINFO && (is_si_special(info) || SI_FROMKERNEL(info)))
return 0;
+ /* if tasks have same uid, then check_kill_permission did check */
+ if (current->uid == p->uid || current->euid == p->uid ||
+ current->uid == p->suid || current->euid == p->suid)
+ return 0;
+
+ /* sigcont is permitted within same session */
+ if (sig == SIGCONT && (task_session_nr(current)==task_session_nr(p)))
+ return 0;
+
if (secid)
/*
* Signal sent as a particular user.
--
1.5.1.1.GIT
-
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