linux-kernel - [RFC v2 12/14] xfs: make the calculation generic in xfs_sb_validate_fsb

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

Message-ID: <20240213093713.1753368-13-kernel@pankajraghav.com>
Date: Tue, 13 Feb 2024 10:37:11 +0100
From: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>
To: linux-xfs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Cc: mcgrof@...nel.org,
	gost.dev@...sung.com,
	akpm@...ux-foundation.org,
	kbusch@...nel.org,
	djwong@...nel.org,
	chandan.babu@...cle.com,
	p.raghav@...sung.com,
	linux-kernel@...r.kernel.org,
	hare@...e.de,
	willy@...radead.org,
	linux-mm@...ck.org,
	david@...morbit.com
Subject: [RFC v2 12/14] xfs: make the calculation generic in xfs_sb_validate_fsb_count()

From: Pankaj Raghav <p.raghav@...sung.com>

Instead of assuming that PAGE_SHIFT is always higher than the blocklog,
make the calculation generic so that page cache count can be calculated
correctly for LBS.

Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>
---
 fs/xfs/xfs_mount.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index aabb25dc3efa..bfbaaecaf668 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -133,9 +133,13 @@ xfs_sb_validate_fsb_count(
 {
 	ASSERT(PAGE_SHIFT >= sbp->sb_blocklog);
 	ASSERT(sbp->sb_blocklog >= BBSHIFT);
+	unsigned long mapping_count;
+	uint64_t bytes = nblocks << sbp->sb_blocklog;
+
+	mapping_count = bytes >> PAGE_SHIFT;
 
 	/* Limited by ULONG_MAX of page cache index */
-	if (nblocks >> (PAGE_SHIFT - sbp->sb_blocklog) > ULONG_MAX)
+	if (mapping_count > ULONG_MAX)
 		return -EFBIG;
 	return 0;
 }
-- 
2.43.0