linux-kernel - [PATCH v3 1/1] vfs: iversion truncate bug fix

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: <ba9643a815137d64301559f174f6f6bf3a552b16.1324551152.git.dmitry.kasatkin@intel.com>
Date:	Thu, 22 Dec 2011 12:54:28 +0200
From:	Dmitry Kasatkin <dmitry.kasatkin@...el.com>
To:	linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org
Cc:	akpm@...ux-foundation.org, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org, zohar@...ux.vnet.ibm.com,
	Dmitry Kasatkin <dmitry.kasatkin@...el.com>
Subject: [PATCH v3 1/1] vfs: iversion truncate bug fix

When a file is truncated with truncate()/ftruncate() and then closed,
iversion is not updated. This patch uses ATTR_SIZE flag as an indication
to increment iversion.

Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@...el.com>
---
 fs/attr.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/fs/attr.c b/fs/attr.c
index 7ee7ba4..b8f55c4 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -176,6 +176,11 @@ int notify_change(struct dentry * dentry, struct iattr * attr)
 			return -EPERM;
 	}
 
+	if ((ia_valid & ATTR_SIZE) && IS_I_VERSION(inode)) {
+		if (attr->ia_size != inode->i_size)
+			inode_inc_iversion(inode);
+	}
+
 	if ((ia_valid & ATTR_MODE)) {
 		mode_t amode = attr->ia_mode;
 		/* Flag setting protected by i_mutex */
-- 
1.7.4.1

--
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/