linux-kernel - [PATCH 26/43] userns: Convert in_group_p and in_egroup_p to use kgid

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Date:	Sat,  7 Apr 2012 22:15:22 -0700
From:	"\"Eric W. Beiderman" <ebiederm@...ssion.com>
To:	<linux-kernel@...r.kernel.org>
Cc:	<linux-fsdevel@...r.kernel.org>,
	<linux-security-module@...r.kernel.org>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...IV.linux.org.uk>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 26/43] userns: Convert in_group_p and in_egroup_p to use kgid_t

From: Eric W. Biederman <ebiederm@...ssion.com>

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 include/linux/cred.h |    4 ++--
 kernel/groups.c      |   14 ++++++--------
 2 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/include/linux/cred.h b/include/linux/cred.h
index fac0579..917dc5a 100644
--- a/include/linux/cred.h
+++ b/include/linux/cred.h
@@ -73,8 +73,8 @@ extern int groups_search(const struct group_info *, kgid_t);
 #define GROUP_AT(gi, i) \
 	((gi)->blocks[(i) / NGROUPS_PER_BLOCK][(i) % NGROUPS_PER_BLOCK])
 
-extern int in_group_p(gid_t);
-extern int in_egroup_p(gid_t);
+extern int in_group_p(kgid_t);
+extern int in_egroup_p(kgid_t);
 
 /*
  * The common credentials for a thread group
diff --git a/kernel/groups.c b/kernel/groups.c
index 84156f2..6b2588d 100644
--- a/kernel/groups.c
+++ b/kernel/groups.c
@@ -256,27 +256,25 @@ SYSCALL_DEFINE2(setgroups, int, gidsetsize, gid_t __user *, grouplist)
 /*
  * Check whether we're fsgid/egid or in the supplemental group..
  */
-int in_group_p(gid_t grp)
+int in_group_p(kgid_t grp)
 {
 	const struct cred *cred = current_cred();
 	int retval = 1;
 
-	if (grp != cred->fsgid)
-		retval = groups_search(cred->group_info,
-				       make_kgid(cred->user_ns, grp));
+	if (!gid_eq(grp, cred->fsgid))
+		retval = groups_search(cred->group_info, grp);
 	return retval;
 }
 
 EXPORT_SYMBOL(in_group_p);
 
-int in_egroup_p(gid_t grp)
+int in_egroup_p(kgid_t grp)
 {
 	const struct cred *cred = current_cred();
 	int retval = 1;
 
-	if (grp != cred->egid)
-		retval = groups_search(cred->group_info,
-				       make_kgid(cred->user_ns, grp));
+	if (!gid_eq(grp, cred->egid))
+		retval = groups_search(cred->group_info, grp);
 	return retval;
 }
 
-- 
1.7.2.5

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