linux-kernel - Re:[f2fs-dev] [PATCH] f2fs: fix use-after-free issue

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Date:   Thu, 23 Jul 2020 23:26:01 +0800 (CST)
From:   "Song Feng" <songfengcn@....com>
To:     "Chao Yu" <yuchao0@...wei.com>
Cc:     jaegeuk@...nel.org, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re:[f2fs-dev] [PATCH] f2fs: fix use-after-free issue

At 2020-07-23 17:28:06, "Chao Yu" <yuchao0@...wei.com> wrote:

>From: Li Guifu <bluce.liguifu@...wei.com>
>
>During umount, f2fs_put_super() unregisters procfs entries after
>f2fs_destroy_segment_manager(), it may cause use-after-free
>issue when umount races with procfs accessing, fix it by relcating
typo issue: relcating -> relocating?
>f2fs_unregister_sysfs().
>
>[Chao Yu: change commit title/message a bit]
>
>Signed-off-by: Li Guifu <bluce.liguifu@...wei.com>
>Reviewed-by: Chao Yu <yuchao0@...wei.com>
>Signed-off-by: Chao Yu <yuchao0@...wei.com>
>---
> fs/f2fs/super.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
>diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
>index 80cb7cd358f8..bf8bd64c8380 100644
>--- a/fs/f2fs/super.c
>+++ b/fs/f2fs/super.c
>@@ -1175,6 +1175,9 @@ static void f2fs_put_super(struct super_block *sb)
> 	int i;
> 	bool dropped;
> 
>+	/* unregister procfs/sysfs entries to avoid race case */
>+	f2fs_unregister_sysfs(sbi);
>+
> 	f2fs_quota_off_umount(sb);
> 
> 	/* prevent remaining shrinker jobs */
>@@ -1240,8 +1243,6 @@ static void f2fs_put_super(struct super_block *sb)
> 
> 	kvfree(sbi->ckpt);
> 
>-	f2fs_unregister_sysfs(sbi);
>-
> 	sb->s_fs_info = NULL;
> 	if (sbi->s_chksum_driver)
> 		crypto_free_shash(sbi->s_chksum_driver);
>-- 
>2.26.2
>
>
>
>_______________________________________________
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>Linux-f2fs-devel@...ts.sourceforge.net
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please check typo issue for comment: relcating->relocating?