linux-kernel - Re: [PATCH 3/3] RFC: p9auth: add p9auth fs

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Date:	Mon, 3 May 2010 18:50:19 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Ashwin Ganti <ashwin.ganti@...il.com>,
	David Howells <dhowells@...hat.com>, Greg KH <greg@...ah.com>,
	rsc@...ch.com, ericvh@...il.com,
	linux-security-module@...r.kernel.org,
	Ron Minnich <rminnich@...il.com>, jt.beard@...il.com,
	Andrew Morgan <morgan@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric Paris <eparis@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Kyle Moffett <kyle@...fetthome.net>,
	Steve Grubb <sgrubb@...hat.com>
Subject: Re: [PATCH 3/3] RFC: p9auth: add p9auth fs

Thanks for the comments, Oleg.  I will fold this patch into the
main patch, but I'll spare everyone a full repost right now.

thanks,
-serge

From: Serge E. Hallyn <serue@...ibm.com>
Subject: [PATCH 1/1] p9auth: address feedback

Address two comments by Oleg:

Return -ERESTARTNOINTR rather than -EINTR if we are interrupted
while waiting on cap_mutex.  And check size of input buffer for
something sane.  A user with hundreds of auxilliary groups could
end up with a > PAGE_SIZE message, so maybe this is a bit too
stringent, but I'm not sure how realistic that is.

Signed-off-by: Serge E. Hallyn <serue@...ibm.com>
---
 kernel/p9auth.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/kernel/p9auth.c b/kernel/p9auth.c
index a174373..5f89b4d 100644
--- a/kernel/p9auth.c
+++ b/kernel/p9auth.c
@@ -354,7 +354,10 @@ static ssize_t p9auth_grant_write(struct file *file, const char __user *buffer,
 	char *user_buf;
 
 	if (mutex_lock_interruptible(&cap_mutex))
-		return -EINTR;
+		return -ERESTARTNOINTR;
+
+	if (count > PAGE_SIZE)
+		return -E2BIG;
 
 	user_buf = kzalloc(count+1, GFP_KERNEL);
 	if (!user_buf)
@@ -387,7 +390,10 @@ static ssize_t p9auth_use_write(struct file *file, const char __user *buffer,
 	char *user_buf;
 
 	if (mutex_lock_interruptible(&cap_mutex))
-		return -EINTR;
+		return -ERESTARTNOINTR;
+
+	if (count > PAGE_SIZE)
+		return -E2BIG;
 
 	user_buf = kzalloc(count+1, GFP_KERNEL);
 	if (!user_buf)
-- 
1.7.0.4

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