From: Cong Wang <xiyou.wangcong@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
Cong Wang <xiyou.wangcong@gmail.com>,
Oleg Nesterov <oleg@redhat.com>,
Alexey Dobriyan <adobriyan@gmail.com>,
Al Viro <viro@zeniv.linux.org.uk>,
Vasiliy Kulikov <segoon@openwall.com>,
David Rientjes <rientjes@google.com>
Subject: [PATCH 4/6] proc: use mm_access() instead of ptrace_may_access()
Date: Wed, 11 Apr 2012 13:59:25 +0800 [thread overview]
Message-ID: <1334123976-11681-4-git-send-email-xiyou.wangcong@gmail.com> (raw)
In-Reply-To: <1334123976-11681-1-git-send-email-xiyou.wangcong@gmail.com>
mm_access() handles this much better, and avoids some race conditions.
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
---
fs/proc/base.c | 7 ++-----
1 files changed, 2 insertions(+), 5 deletions(-)
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 8608a4d..f1d18fc 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2035,11 +2035,8 @@ static int map_files_d_revalidate(struct dentry *dentry, struct nameidata *nd)
if (!task)
goto out_notask;
- if (!ptrace_may_access(task, PTRACE_MODE_READ))
- goto out;
-
- mm = get_task_mm(task);
- if (!mm)
+ mm = mm_access(task, PTRACE_MODE_READ);
+ if (IS_ERR_OR_NULL(mm))
goto out;
if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) {
--
1.7.7.6
next prev parent reply other threads:[~2012-04-11 6:01 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-11 5:59 [PATCH 1/6 v3] proc: clean up /proc/<pid>/environ handling Cong Wang
2012-04-11 5:59 ` [PATCH 2/6] proc: unify ptrace_may_access locking code Cong Wang
2012-04-11 5:59 ` [PATCH 3/6] proc: remove mm_for_maps() Cong Wang
2012-04-12 0:38 ` Hugh Dickins
2012-04-11 5:59 ` Cong Wang [this message]
2012-04-11 5:59 ` [PATCH 5/6] proc: use task_access_lock() instead of ptrace_may_access() Cong Wang
2012-04-12 13:22 ` Cong Wang
2012-04-12 15:29 ` Djalal Harouni
2012-04-11 5:59 ` [PATCH 6/6] proc: use IS_ERR_OR_NULL() Cong Wang
2012-04-12 0:41 ` Hugh Dickins
2012-04-12 13:17 ` Cong Wang
2012-04-12 13:23 ` Alexey Dobriyan
2012-04-12 18:46 ` KOSAKI Motohiro
2012-04-12 19:26 ` Hugh Dickins
2012-04-12 19:31 ` Andrew Morton
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1334123976-11681-4-git-send-email-xiyou.wangcong@gmail.com \
--to=xiyou.wangcong@gmail.com \
--cc=adobriyan@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=oleg@redhat.com \
--cc=rientjes@google.com \
--cc=segoon@openwall.com \
--cc=viro@zeniv.linux.org.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®