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Mon, 21 Sep 2026 21:46:13 -0700 (PDT) From: Yuchao Zhang To: Yu Kuai , Song Liu Cc: Xiao Ni , NeilBrown , linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Yuchao Zhang Subject: [PATCH v2] md: validate bblog_size when loading v1.x badblocks metadata Date: Tue, 22 Sep 2026 12:46:06 +0800 Message-ID: <20260922044606.30774-1-ndaugoing@gmail.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In super_1_load(), when the on-disk feature_map does not have MD_FEATURE_BAD_BLOCKS set but sb->bblog_offset is non-zero, rdev->badblocks.shift is initialized to 0 without validating sb->bblog_size. The same field is validated in the MD_FEATURE_BAD_BLOCKS branch ("sectors > (PAGE_SIZE / 512)"), but this branch bypasses that check. A forged on-disk superblock (malicious storage device or crafted image) can therefore carry an oversized sb->bblog_size. When bad blocks are later recorded, super_1_sync() sets bb->size from sb->bblog_size and md_write_metadata() issues a bio larger than the single rdev->bb_page, reading beyond the page and leaking kernel memory contents to disk. sb->bblog_size is never modified by the kernel between load and sync, and the MD_FEATURE_BAD_BLOCKS branch already validates it, so checking it in this branch is sufficient to cover both paths. Fix this by rejecting an oversized sb->bblog_size with -EINVAL, matching the existing check in the MD_FEATURE_BAD_BLOCKS branch. Fixes: 2699b67223ac ("md: load/store badblock list from v1.x metadata") Cc: stable@vger.kernel.org Signed-off-by: Yuchao Zhang --- drivers/md/md.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index 680b34a63cb3..1caa92b40f9a 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -1934,8 +1934,11 @@ static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_ if (!badblocks_set(&rdev->badblocks, sector, count, 1)) return -EINVAL; } - } else if (sb->bblog_offset != 0) + } else if (sb->bblog_offset != 0) { + if (le16_to_cpu(sb->bblog_size) > (PAGE_SIZE / 512)) + return -EINVAL; rdev->badblocks.shift = 0; + } if ((le32_to_cpu(sb->feature_map) & (MD_FEATURE_PPL | MD_FEATURE_MULTIPLE_PPLS))) { -- 2.53.0