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From 9bf3d20331295b1ecb81f4ed9ef358c51699a050 Mon Sep 17 00:00:00 2001
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From: Zhang Yi <yi.zhang@huawei.com>
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Date: Fri, 8 Oct 2021 17:38:20 +0800
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Subject: [PATCH] quota: check block number when reading the block in quota
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file
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Git-commit: 9bf3d20331295b1ecb81f4ed9ef358c51699a050
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Patch-mainline: v5.16-rc1
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References: bsc#1197366 CVE-2021-45868
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The block number in the quota tree on disk should be smaller than the
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v2_disk_dqinfo.dqi_blocks. If the quota file was corrupted, we may be
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allocating an 'allocated' block and that would lead to a loop in a tree,
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which will probably trigger oops later. This patch adds a check for the
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block number in the quota tree to prevent such potential issue.
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Link: https://lore.kernel.org/r/20211008093821.1001186-2-yi.zhang@huawei.com
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Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
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Cc: stable@kernel.org
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Signed-off-by: Jan Kara <jack@suse.cz>
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Acked-by: Vasant Karasulli <vkarasulli@suse.de>
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---
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fs/quota/quota_tree.c | 14 ++++++++++++++
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1 file changed, 14 insertions(+)
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diff --git a/fs/quota/quota_tree.c b/fs/quota/quota_tree.c
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index d3e995e1046f..583b7f7715f9 100644
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--- a/fs/quota/quota_tree.c
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+++ b/fs/quota/quota_tree.c
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@@ -479,6 +479,13 @@ static int remove_tree(struct qtree_mem_dqinfo *info, struct dquot *dquot,
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goto out_buf;
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}
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newblk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]);
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+ if (newblk < QT_TREEOFF || newblk >= info->dqi_blocks) {
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+ quota_error(dquot->dq_sb, "Getting block too big (%u >= %u)",
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+ newblk, info->dqi_blocks);
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+ ret = -EUCLEAN;
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+ goto out_buf;
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+ }
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+
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if (depth == info->dqi_qtree_depth - 1) {
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ret = free_dqentry(info, dquot, newblk);
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newblk = 0;
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@@ -578,6 +585,13 @@ static loff_t find_tree_dqentry(struct qtree_mem_dqinfo *info,
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blk = le32_to_cpu(ref[get_index(info, dquot->dq_id, depth)]);
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if (!blk) /* No reference? */
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goto out_buf;
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+ if (blk < QT_TREEOFF || blk >= info->dqi_blocks) {
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+ quota_error(dquot->dq_sb, "Getting block too big (%u >= %u)",
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+ blk, info->dqi_blocks);
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+ ret = -EUCLEAN;
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+ goto out_buf;
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+ }
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+
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if (depth < info->dqi_qtree_depth - 1)
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ret = find_tree_dqentry(info, dquot, blk, depth+1);
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else
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--
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2.32.0
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