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([186.22.57.86]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-31174a5b26csm8537100eec.15.2026.07.07.06.59.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Jul 2026 06:59:10 -0700 (PDT) From: Aldo Ariel Panzardo To: linux-xfs@vger.kernel.org, Carlos Maiolino Cc: "Darrick J . Wong" , Chandan Babu R , linux-kernel@vger.kernel.org, Aldo Ariel Panzardo Subject: [PATCH] xfs: bound inode fork length against the fork size during log recovery Date: Tue, 7 Jul 2026 10:58:43 -0300 Message-ID: <20260707135843.3213352-1-qwe.aldo@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit xlog_recover_inode_commit_pass2() copies an inode log item's data/attr fork region into the inode buffer using the on-log region length without bounding it against the fork capacity, e.g.: len = item->ri_buf[2].iov_len; memcpy(XFS_DFORK_DPTR(dip), src, len); The only guard is an ASSERT, which is a no-op on production kernels (CONFIG_XFS_DEBUG off), and xfs_dinode_verify() runs only after the copy. A crafted image with a dirty log can therefore drive a heap out-of-bounds write at mount time. The XFS_ILOG_DBROOT sibling already passes XFS_DFORK_DSIZE as a bound; the DDATA/DEXT and ADATA/AEXT memcpy paths did not. Reject the log item with -EFSCORRUPTED when the region length exceeds the destination fork size. Fixes: 658fa68b6f34 ("xfs: refactor log recovery inode item dispatch for pass2 commit functions") Signed-off-by: Aldo Ariel Panzardo --- fs/xfs/xfs_inode_item_recover.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/fs/xfs/xfs_inode_item_recover.c b/fs/xfs/xfs_inode_item_recover.c index 169a8fe3bf0a..388d3a8dbd31 100644 --- a/fs/xfs/xfs_inode_item_recover.c +++ b/fs/xfs/xfs_inode_item_recover.c @@ -510,6 +510,10 @@ xlog_recover_inode_commit_pass2( switch (fields & XFS_ILOG_DFORK) { case XFS_ILOG_DDATA: case XFS_ILOG_DEXT: + if (len > XFS_DFORK_DSIZE(dip, mp)) { + error = -EFSCORRUPTED; + goto out_release; + } memcpy(XFS_DFORK_DPTR(dip), src, len); break; @@ -545,8 +549,11 @@ xlog_recover_inode_commit_pass2( switch (in_f->ilf_fields & XFS_ILOG_AFORK) { case XFS_ILOG_ADATA: case XFS_ILOG_AEXT: + if (len > XFS_DFORK_ASIZE(dip, mp)) { + error = -EFSCORRUPTED; + goto out_release; + } dest = XFS_DFORK_APTR(dip); - ASSERT(len <= XFS_DFORK_ASIZE(dip, mp)); memcpy(dest, src, len); break; -- 2.43.0