{"id":"CVE-2023-52900","summary":"nilfs2: fix general protection fault in nilfs_btree_insert()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix general protection fault in nilfs_btree_insert()\n\nIf nilfs2 reads a corrupted disk image and tries to reads a b-tree node\nblock by calling __nilfs_btree_get_block() against an invalid virtual\nblock address, it returns -ENOENT because conversion of the virtual block\naddress to a disk block address fails.  However, this return value is the\nsame as the internal code that b-tree lookup routines return to indicate\nthat the block being searched does not exist, so functions that operate on\nthat b-tree may misbehave.\n\nWhen nilfs_btree_insert() receives this spurious 'not found' code from\nnilfs_btree_do_lookup(), it misunderstands that the 'not found' check was\nsuccessful and continues the insert operation using incomplete lookup path\ndata, causing the following crash:\n\n general protection fault, probably for non-canonical address\n 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN\n KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]\n ...\n RIP: 0010:nilfs_btree_get_nonroot_node fs/nilfs2/btree.c:418 [inline]\n RIP: 0010:nilfs_btree_prepare_insert fs/nilfs2/btree.c:1077 [inline]\n RIP: 0010:nilfs_btree_insert+0x6d3/0x1c10 fs/nilfs2/btree.c:1238\n Code: bc 24 80 00 00 00 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89\n ff e8 4b 02 92 fe 4d 8b 3f 49 83 c7 28 4c 89 f8 48 c1 e8 03 \u003c42\u003e 80 3c\n 28 00 74 08 4c 89 ff e8 2e 02 92 fe 4d 8b 3f 49 83 c7 02\n ...\n Call Trace:\n \u003cTASK\u003e\n  nilfs_bmap_do_insert fs/nilfs2/bmap.c:121 [inline]\n  nilfs_bmap_insert+0x20d/0x360 fs/nilfs2/bmap.c:147\n  nilfs_get_block+0x414/0x8d0 fs/nilfs2/inode.c:101\n  __block_write_begin_int+0x54c/0x1a80 fs/buffer.c:1991\n  __block_write_begin fs/buffer.c:2041 [inline]\n  block_write_begin+0x93/0x1e0 fs/buffer.c:2102\n  nilfs_write_begin+0x9c/0x110 fs/nilfs2/inode.c:261\n  generic_perform_write+0x2e4/0x5e0 mm/filemap.c:3772\n  __generic_file_write_iter+0x176/0x400 mm/filemap.c:3900\n  generic_file_write_iter+0xab/0x310 mm/filemap.c:3932\n  call_write_iter include/linux/fs.h:2186 [inline]\n  new_sync_write fs/read_write.c:491 [inline]\n  vfs_write+0x7dc/0xc50 fs/read_write.c:584\n  ksys_write+0x177/0x2a0 fs/read_write.c:637\n  do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n  do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80\n  entry_SYSCALL_64_after_hwframe+0x63/0xcd\n ...\n \u003c/TASK\u003e\n\nThis patch fixes the root cause of this problem by replacing the error\ncode that __nilfs_btree_get_block() returns on block address conversion\nfailure from -ENOENT to another internal code -EINVAL which means that the\nb-tree metadata is corrupted.\n\nBy returning -EINVAL, it propagates without glitches, and for all relevant\nb-tree operations, functions in the upper bmap layer output an error\nmessage indicating corrupted b-tree metadata via\nnilfs_bmap_convert_error(), and code -EIO will be eventually returned as\nit should be.","modified":"2026-04-02T09:43:28.119648Z","published":"2024-08-21T06:10:40.533Z","related":["SUSE-SU-2024:3190-1","SUSE-SU-2024:3209-1","SUSE-SU-2024:3227-1","SUSE-SU-2024:3408-1","SUSE-SU-2024:3483-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52900.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0bf463939c09e5b2c35c71ed74a5fd60a74d6a04"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3c2a2ff67d46106715c2132021b98bd057c27545"},{"type":"WEB","url":"https://git.kernel.org/stable/c/45627a1a6450662e1e0f8174ef07b05710a20062"},{"type":"WEB","url":"https://git.kernel.org/stable/c/712bd74eccb9d3626a0a236641962eca8e11a243"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7633355e5c7f29c049a9048e461427d1d8ed3051"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b0ba060d3287108eba17603bee3810e4cf2c272d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d9fde9eab1766170ff2ade67d09178d2cfd78749"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52900.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-52900"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a60be987d45dd510aeb54389526f9957cfab106c"},{"fixed":"3c2a2ff67d46106715c2132021b98bd057c27545"},{"fixed":"d9fde9eab1766170ff2ade67d09178d2cfd78749"},{"fixed":"b0ba060d3287108eba17603bee3810e4cf2c272d"},{"fixed":"712bd74eccb9d3626a0a236641962eca8e11a243"},{"fixed":"45627a1a6450662e1e0f8174ef07b05710a20062"},{"fixed":"0bf463939c09e5b2c35c71ed74a5fd60a74d6a04"},{"fixed":"7633355e5c7f29c049a9048e461427d1d8ed3051"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-52900.json"}}],"schema_version":"1.7.5"}