linux-kernel - [PATCH mm] unionfs: clear partial read

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <Pine.LNX.4.64.0711090728130.22720@blonde.wat.veritas.com>
Date:	Fri, 9 Nov 2007 07:31:07 +0000 (GMT)
From:	Hugh Dickins <hugh@...itas.com>
To:	Erez Zadok <ezk@...sunysb.edu>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH mm] unionfs: clear partial read

unionfs_do_readpage forgot to clear the rest of the page when vfs_read
does not fill the page: fix that.

Signed-off-by: Hugh Dickins <hugh@...itas.com>
---

 fs/unionfs/mmap.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- 2.6.24-rc1-mm1/fs/unionfs/mmap.c	2007-11-04 13:48:02.000000000 +0000
+++ linux/fs/unionfs/mmap.c	2007-11-06 13:51:02.000000000 +0000
@@ -176,7 +176,8 @@ static int unionfs_do_readpage(struct fi
 	err = vfs_read(lower_file, page_data, PAGE_CACHE_SIZE,
 		       &lower_file->f_pos);
 	set_fs(old_fs);
-
+	if (err >= 0 && err < PAGE_CACHE_SIZE)
+		memset(page_data + err, 0, PAGE_CACHE_SIZE - err);
 	kunmap(page);
 
 	if (err < 0)
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/