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From: Ian Kent <raven@themaw.net>
To: Kernel Mailing List <linux-kernel@vger.kernel.org>
Cc: David Howells <dhowells@redhat.com>,
	Oleg Nesterov <onestero@redhat.com>,
	Trond Myklebust <trond.myklebust@primarydata.com>,
	"J. Bruce Fields" <bfields@fieldses.org>,
	Benjamin Coddington <bcodding@redhat.com>,
	Al Viro <viro@ZenIV.linux.org.uk>,
	Jeff Layton <jeff.layton@primarydata.com>,
	"Eric W. Biederman" <ebiederm@xmission.com>
Subject: [RFC PATCH 5 6/7] KEYS - use correct memory allocation flag in call_usermodehelper_keys()
Date: Tue, 31 Mar 2015 11:15:27 +0800	[thread overview]
Message-ID: <20150331031525.10464.67887.stgit@pluto.fritz.box> (raw)
In-Reply-To: <20150331030340.10464.30272.stgit@pluto.fritz.box>

From: Ian Kent <ikent@redhat.com>

When call_usermodehelper_keys() is called it assumes it won't be called
with the flag UMH_NO_WAIT. Currently that's always the case.

Change this to check the flag and use the correct kernel memory allocation
flag to guard against future changes.

Signed-off-by: Ian Kent <ikent@redhat.com>
Cc: Benjamin Coddington <bcodding@redhat.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: J. Bruce Fields <bfields@fieldses.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Trond Myklebust <trond.myklebust@primarydata.com>
Cc: Oleg Nesterov <onestero@redhat.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Jeff Layton <jeff.layton@primarydata.com>
---
 security/keys/request_key.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/security/keys/request_key.c b/security/keys/request_key.c
index 486ef6f..e865f9f 100644
--- a/security/keys/request_key.c
+++ b/security/keys/request_key.c
@@ -76,8 +76,10 @@ static int call_usermodehelper_keys(char *path, char **argv, char **envp,
 					struct key *session_keyring, int wait)
 {
 	struct subprocess_info *info;
+	unsigned int gfp_mask = (wait & UMH_NO_WAIT) ?
+					GFP_ATOMIC : GFP_KERNEL;
 
-	info = call_usermodehelper_setup(path, argv, envp, GFP_KERNEL,
+	info = call_usermodehelper_setup(path, argv, envp, gfp_mask,
 					  umh_keys_init, umh_keys_cleanup,
 					  session_keyring);
 	if (!info)


  parent reply	other threads:[~2015-03-31  3:15 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-31  3:14 [RFC PATCH v5 0/7] Another attempt at contained helper execution Ian Kent
2015-03-31  3:14 ` [RFC PATCH 5 1/7] kmod - add workqueue service thread store Ian Kent
2015-03-31 11:21   ` Jeff Layton
2015-03-31 12:59     ` Ian Kent
2015-03-31  3:14 ` [RFC PATCH 5 2/7] kmod - teach usermodehelper to use service workqueues Ian Kent
2015-03-31  3:14 ` [RFC PATCH 5 3/7] nfsd - use service thread if not executing in init namespace Ian Kent
2015-03-31 13:14   ` J. Bruce Fields
2015-04-01  0:22     ` Ian Kent
2015-04-02 15:59       ` J. Bruce Fields
2015-03-31  3:15 ` [RFC PATCH 5 4/7] nfs - cache_lib " Ian Kent
2015-03-31  3:15 ` [RFC PATCH 5 5/7] nfs - objlayout " Ian Kent
2015-03-31  3:15 ` Ian Kent [this message]
2015-03-31  3:15 ` [RFC PATCH 5 7/7] KEYS: exec request key within service thread of key creator Ian Kent
2015-04-02 12:43 ` [RFC PATCH 5 1/7] kmod - add workqueue service thread store David Howells
2015-04-07  0:42   ` Ian Kent
2015-04-02 12:58 ` [RFC PATCH 5 7/7] KEYS: exec request key within service thread of key creator David Howells
2015-04-07  0:54   ` Ian Kent
2015-04-02 13:00 ` [RFC PATCH 5 6/7] KEYS - use correct memory allocation flag in call_usermodehelper_keys() David Howells

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