Description
In the Linux kernel, the following vulnerability has been resolved: nilfs2: reject invalid block index in GC ioctl Syzbot reported list corruption caused by a double list_add_tail() call on bh->b_assoc_buffers within nilfs_lookup_dirty_data_buffers(). Analysis revealed that the root cause was the insertion of a page/folio with a page index of ULONG_MAX into the page cache via the GC ioctl. filemap_get_folios_tag(), called by nilfs_lookup_dirty_data_buffers(), repeatedly detects a dirty folio with a page index of ULONG_MAX due to index wrap-around, leading to duplicate processing of dirty buffers. As a preparatory step, the GC ioctl loads the page/folio of the block to be moved during GC and inserts it into the page cache based on information in the nilfs_vdesc structure passed as an argument. Normally, this does not cause issues because the user-space GC library configures the nilfs_vdesc structure properly. However, since there is no range check on the parameters determining the page index, a request with artificially crafted parameters -- such as those generated by Syzbot -- can result in a page/folio being inserted with a page index of ULONG_MAX, triggering the above problem. This resolves the issue by checking the ranges of 'vd_offset' and 'vd_vblocknr' in the nilfs_vdesc structure that determine the page index, thereby preventing the invalid page/folio insertions.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
7942b919f7321f95a777d396ff7894a7a83dc9b0 to < 898404cdf882d7b54f1132f75570984ca3214796affected7942b919f7321f95a777d396ff7894a7a83dc9b0 to < ba8a8b563a28d358c45c62a306d421434a058648affected7942b919f7321f95a777d396ff7894a7a83dc9b0 to < 3bd064ccc70b85f9a3d53aece29dc8473be5a226affected7942b919f7321f95a777d396ff7894a7a83dc9b0 to < a5e776e2937581d67ec5b9b4d27b0f70d7baa6b1affected7942b919f7321f95a777d396ff7894a7a83dc9b0 to < 68aa9ab6f8f2895713aa6ddf781463ed8ea5ba44affected7942b919f7321f95a777d396ff7894a7a83dc9b0 to < e447f7edb99bd00cec63d6f3049e2e5074946f71affected7942b919f7321f95a777d396ff7894a7a83dc9b0 to < ec6ddf271dfa4c7e3147bc2c8b2bad4315f316a1affected7942b919f7321f95a777d396ff7894a7a83dc9b0 to < fbcfb75c20d71a5b542ad4ac3b79d10b997c8152affected7942b919f7321f95a777d396ff7894a7a83dc9b0 to < a1735eae55448bc79c2da6593455791e886f6ed8affected
Linux Linux
Default version status: affected
2.6.30affected0 to < 2.6.30unaffected5.10.269 to ≤ 5.10.*unaffected5.15.220 to ≤ 5.15.*unaffected6.1.187 to ≤ 6.1.*unaffected6.6.156 to ≤ 6.6.*unaffected6.12.108 to ≤ 6.12.*unaffected6.18.47 to ≤ 6.18.*unaffected7.1.11 to ≤ 7.1.*unaffected7.2.1 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/898404cdf882d7b54f1132f75570984ca3214796 ↗
- https://git.kernel.org/stable/c/ba8a8b563a28d358c45c62a306d421434a058648 ↗
- https://git.kernel.org/stable/c/3bd064ccc70b85f9a3d53aece29dc8473be5a226 ↗
- https://git.kernel.org/stable/c/a5e776e2937581d67ec5b9b4d27b0f70d7baa6b1 ↗
- https://git.kernel.org/stable/c/68aa9ab6f8f2895713aa6ddf781463ed8ea5ba44 ↗
- https://git.kernel.org/stable/c/e447f7edb99bd00cec63d6f3049e2e5074946f71 ↗
- https://git.kernel.org/stable/c/ec6ddf271dfa4c7e3147bc2c8b2bad4315f316a1 ↗
- https://git.kernel.org/stable/c/fbcfb75c20d71a5b542ad4ac3b79d10b997c8152 ↗
- https://git.kernel.org/stable/c/a1735eae55448bc79c2da6593455791e886f6ed8 ↗