linux-kernel - [172/272] Fix prlimit64 for suid/sgid processes

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Date:	Tue, 15 Feb 2011 16:13:49 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Kacper Kornet <kornet@...k.edu.pl>, Jiri Slaby <jslaby@...e.cz>
Subject: [172/272] Fix prlimit64 for suid/sgid processes

2.6.37-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Kacper Kornet <kornet@...k.edu.pl>

commit aa5bd67dcfdf9af34c7fa36ebc87d4e1f7e91873 upstream.

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>
Acked-by: Jiri Slaby <jslaby@...e.cz>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 kernel/sys.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1377,7 +1377,8 @@ static int check_prlimit_permission(stru
 	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 ||


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