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[2403:580d:fda1:0:2bb5:f164:6e6a:38d8]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-83965d34872sm18488520b3a.22.2026.05.10.15.18.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 10 May 2026 15:18:38 -0700 (PDT) Message-ID: Date: Mon, 11 May 2026 07:48:31 +0930 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3] btrfs: free-space-tree: reject mismatched extent and bitmap items To: Zhang Cen , Chris Mason , David Sterba Cc: linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, zerocling0077@gmail.com, 2045gemini@gmail.com References: <20260510074943.2644334-1-rollkingzzc@gmail.com> Content-Language: en-US From: Qu Wenruo Autocrypt: addr=wqu@suse.com; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNGFF1IFdlbnJ1byA8d3F1QHN1c2UuY29tPsLAlAQTAQgAPgIbAwULCQgHAgYVCAkKCwIE FgIDAQIeAQIXgBYhBC3fcuWlpVuonapC4cI9kfOhJf6oBQJnEXVgBQkQ/lqxAAoJEMI9kfOh Jf6o+jIH/2KhFmyOw4XWAYbnnijuYqb/obGae8HhcJO2KIGcxbsinK+KQFTSZnkFxnbsQ+VY fvtWBHGt8WfHcNmfjdejmy9si2jyy8smQV2jiB60a8iqQXGmsrkuR+AM2V360oEbMF3gVvim 2VSX2IiW9KERuhifjseNV1HLk0SHw5NnXiWh1THTqtvFFY+CwnLN2GqiMaSLF6gATW05/sEd V17MdI1z4+WSk7D57FlLjp50F3ow2WJtXwG8yG8d6S40dytZpH9iFuk12Sbg7lrtQxPPOIEU rpmZLfCNJJoZj603613w/M8EiZw6MohzikTWcFc55RLYJPBWQ+9puZtx1DopW2jOwE0EWdWB rwEIAKpT62HgSzL9zwGe+WIUCMB+nOEjXAfvoUPUwk+YCEDcOdfkkM5FyBoJs8TCEuPXGXBO Cl5P5B8OYYnkHkGWutAVlUTV8KESOIm/KJIA7jJA+Ss9VhMjtePfgWexw+P8itFRSRrrwyUf E+0WcAevblUi45LjWWZgpg3A80tHP0iToOZ5MbdYk7YFBE29cDSleskfV80ZKxFv6koQocq0 vXzTfHvXNDELAuH7Ms/WJcdUzmPyBf3Oq6mKBBH8J6XZc9LjjNZwNbyvsHSrV5bgmu/THX2n g/3be+iqf6OggCiy3I1NSMJ5KtR0q2H2Nx2Vqb1fYPOID8McMV9Ll6rh8S8AEQEAAcLAfAQY AQgAJgIbDBYhBC3fcuWlpVuonapC4cI9kfOhJf6oBQJnEXWBBQkQ/lrSAAoJEMI9kfOhJf6o cakH+QHwDszsoYvmrNq36MFGgvAHRjdlrHRBa4A1V1kzd4kOUokongcrOOgHY9yfglcvZqlJ qfa4l+1oxs1BvCi29psteQTtw+memmcGruKi+YHD7793zNCMtAtYidDmQ2pWaLfqSaryjlzR /3tBWMyvIeWZKURnZbBzWRREB7iWxEbZ014B3gICqZPDRwwitHpH8Om3eZr7ygZck6bBa4MU o1XgbZcspyCGqu1xF/bMAY2iCDcq6ULKQceuKkbeQ8qxvt9hVxJC2W3lHq8dlK1pkHPDg9wO JoAXek8MF37R8gpLoGWl41FIUb3hFiu3zhDDvslYM4BmzI18QgQTQnotJH8= In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit 在 2026/5/11 00:33, Zhang Cen 写道: > btrfs_load_free_space_tree() reads FREE_SPACE_INFO once and then chooses > the bitmap or extent loader for all following free-space records until the > next FREE_SPACE_INFO item. Those loaders currently enforce the selected > record type only with ASSERT(). > > On production builds without CONFIG_BTRFS_ASSERT, a malformed free-space > tree can therefore be decoded in the wrong mode. An EXTENT item can reach > btrfs_free_space_test_bit() as bitmap data, while a BITMAP item can be > added as a full free extent. The latter corrupts the in-memory free-space > cache and the former can read beyond the item payload. > > Validate every post-info key before decoding it. Reject keys whose type > does not match the mode selected by FREE_SPACE_INFO, and reject keys > whose range extends past the block group, returning -EUCLEAN instead of > feeding the wrong record type to the bitmap or extent decoder. > > Also reject zero-length FREE_SPACE_EXTENT items in tree-checker, matching > the existing FREE_SPACE_BITMAP zero-length check. This keeps the loader > range check simple and prevents a zero-length extent item from being a > valid on-disk free-space record. > > A malformed extent-as-bitmap record was observed as a KASAN fault in > extent_buffer_test_bit() (fs/btrfs/extent_io.c:4313), reached through > btrfs_free_space_test_bit() (fs/btrfs/free-space-tree.c:518) from > load_free_space_bitmaps() (fs/btrfs/free-space-tree.c:1603). > > Signed-off-by: Zhang Cen > --- > Changes since v2: > - Regenerate the mail-ready patch without the nested mbox wrapper. > - No code changes beyond the v2 fix. If you want to put a changelog, please include all modification, not only the last modification but from the very beginning. A proper example: https://lore.kernel.org/linux-btrfs/335133ce1989ac89a6de007d4db05f5f4a6c1be2.1775491985.git.boris@bur.io/ Otherwise looks good to me. Reviewed-by: Qu Wenruo I'll give it a full fstests run before merging. Thanks, Qu