cvelist/2024/46xxx/CVE-2024-46687.json

{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2024-46687",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix a use-after-free when hitting errors inside btrfs_submit_chunk()\n\n[BUG]\nThere is an internal report that KASAN is reporting use-after-free, with\nthe following backtrace:\n\n  BUG: KASAN: slab-use-after-free in btrfs_check_read_bio+0xa68/0xb70 [btrfs]\n  Read of size 4 at addr ffff8881117cec28 by task kworker/u16:2/45\n  CPU: 1 UID: 0 PID: 45 Comm: kworker/u16:2 Not tainted 6.11.0-rc2-next-20240805-default+ #76\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 04/01/2014\n  Workqueue: btrfs-endio btrfs_end_bio_work [btrfs]\n  Call Trace:\n   dump_stack_lvl+0x61/0x80\n   print_address_description.constprop.0+0x5e/0x2f0\n   print_report+0x118/0x216\n   kasan_report+0x11d/0x1f0\n   btrfs_check_read_bio+0xa68/0xb70 [btrfs]\n   process_one_work+0xce0/0x12a0\n   worker_thread+0x717/0x1250\n   kthread+0x2e3/0x3c0\n   ret_from_fork+0x2d/0x70\n   ret_from_fork_asm+0x11/0x20\n\n  Allocated by task 20917:\n   kasan_save_stack+0x37/0x60\n   kasan_save_track+0x10/0x30\n   __kasan_slab_alloc+0x7d/0x80\n   kmem_cache_alloc_noprof+0x16e/0x3e0\n   mempool_alloc_noprof+0x12e/0x310\n   bio_alloc_bioset+0x3f0/0x7a0\n   btrfs_bio_alloc+0x2e/0x50 [btrfs]\n   submit_extent_page+0x4d1/0xdb0 [btrfs]\n   btrfs_do_readpage+0x8b4/0x12a0 [btrfs]\n   btrfs_readahead+0x29a/0x430 [btrfs]\n   read_pages+0x1a7/0xc60\n   page_cache_ra_unbounded+0x2ad/0x560\n   filemap_get_pages+0x629/0xa20\n   filemap_read+0x335/0xbf0\n   vfs_read+0x790/0xcb0\n   ksys_read+0xfd/0x1d0\n   do_syscall_64+0x6d/0x140\n   entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\n  Freed by task 20917:\n   kasan_save_stack+0x37/0x60\n   kasan_save_track+0x10/0x30\n   kasan_save_free_info+0x37/0x50\n   __kasan_slab_free+0x4b/0x60\n   kmem_cache_free+0x214/0x5d0\n   bio_free+0xed/0x180\n   end_bbio_data_read+0x1cc/0x580 [btrfs]\n   btrfs_submit_chunk+0x98d/0x1880 [btrfs]\n   btrfs_submit_bio+0x33/0x70 [btrfs]\n   submit_one_bio+0xd4/0x130 [btrfs]\n   submit_extent_page+0x3ea/0xdb0 [btrfs]\n   btrfs_do_readpage+0x8b4/0x12a0 [btrfs]\n   btrfs_readahead+0x29a/0x430 [btrfs]\n   read_pages+0x1a7/0xc60\n   page_cache_ra_unbounded+0x2ad/0x560\n   filemap_get_pages+0x629/0xa20\n   filemap_read+0x335/0xbf0\n   vfs_read+0x790/0xcb0\n   ksys_read+0xfd/0x1d0\n   do_syscall_64+0x6d/0x140\n   entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\n[CAUSE]\nAlthough I cannot reproduce the error, the report itself is good enough\nto pin down the cause.\n\nThe call trace is the regular endio workqueue context, but the\nfree-by-task trace is showing that during btrfs_submit_chunk() we\nalready hit a critical error, and is calling btrfs_bio_end_io() to error\nout.  And the original endio function called bio_put() to free the whole\nbio.\n\nThis means a double freeing thus causing use-after-free, e.g.:\n\n1. Enter btrfs_submit_bio() with a read bio\n   The read bio length is 128K, crossing two 64K stripes.\n\n2. The first run of btrfs_submit_chunk()\n\n2.1 Call btrfs_map_block(), which returns 64K\n2.2 Call btrfs_split_bio()\n    Now there are two bios, one referring to the first 64K, the other\n    referring to the second 64K.\n2.3 The first half is submitted.\n\n3. The second run of btrfs_submit_chunk()\n\n3.1 Call btrfs_map_block(), which by somehow failed\n    Now we call btrfs_bio_end_io() to handle the error\n\n3.2 btrfs_bio_end_io() calls the original endio function\n    Which is end_bbio_data_read(), and it calls bio_put() for the\n    original bio.\n\n    Now the original bio is freed.\n\n4. The submitted first 64K bio finished\n   Now we call into btrfs_check_read_bio() and tries to advance the bio\n   iter.\n   But since the original bio (thus its iter) is already freed, we\n   trigger the above use-after free.\n\n   And even if the memory is not poisoned/corrupted, we will later call\n   the original endio function, causing a double freeing.\n\n[FIX]\nInstead of calling btrfs_bio_end_io(), call btrfs_orig_bbio_end_io(),\nwhich has the extra check on split bios and do the pr\n---truncated---"
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Linux",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "852eee62d31a",
                                            "version_value": "51722b99f41f"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "6.3",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "6.3",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.6.49",
                                                        "lessThanOrEqual": "6.6.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.10.8",
                                                        "lessThanOrEqual": "6.10.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.11",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/51722b99f41f5e722ffa10b8f61e802a0e70b331",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/51722b99f41f5e722ffa10b8f61e802a0e70b331"
            },
            {
                "url": "https://git.kernel.org/stable/c/4a3b9e1a8e6cd1a8d427a905e159de58d38941cc",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/4a3b9e1a8e6cd1a8d427a905e159de58d38941cc"
            },
            {
                "url": "https://git.kernel.org/stable/c/10d9d8c3512f16cad47b2ff81ec6fc4b27d8ee10",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/10d9d8c3512f16cad47b2ff81ec6fc4b27d8ee10"
            }
        ]
    },
    "generator": {
        "engine": "bippy-9e1c9544281a"
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}