linux-kernel - [PATCH v2] Fix prlimit64 for suid/sgid processes

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Date:	Sat, 29 Jan 2011 00:21:04 +0100
From:	Kacper Kornet <kornet@...k.edu.pl>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH v2] Fix prlimit64 for suid/sgid processes

Since check_prlimit_permission always fails in the case of SUID/GUID
processes, such processes are not able to read or set their own limits.
This commit changes this by assuming that process can always read/change
its own limits.

Signed-off-by: Kacper Kornet <kornet@...k.edu.pl>
---
 kernel/sys.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/sys.c b/kernel/sys.c
index e9ad444..03bead7 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1375,7 +1375,8 @@ static int check_prlimit_permission(struct task_struct *task)
 	const struct cred *cred = current_cred(), *tcred;
 
 	tcred = __task_cred(task);
-	if ((cred->uid != tcred->euid ||
+	if (current != task &&
+	    (cred->uid != tcred->euid ||
 	     cred->uid != tcred->suid ||
 	     cred->uid != tcred->uid  ||
 	     cred->gid != tcred->egid ||
-- 
1.7.3.5

-- 
  Kacper 
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