{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"HIGH" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:btrfs: fix a use-after-free when hitting errors inside btrfs_submit_chunk()[BUG]There is an internal report that KASAN is reporting use-after-free, withthe following backtrace: BUG: KASAN: slab-use-after-free in btrfs_check_read_bio+0xa68/0xb70 [btrfs] Read of size 4 at addr ffff8881117cec28 by task kworker/u16:2/45 CPU: 1 UID: 0 PID: 45 Comm: kworker/u16:2 Not tainted 6.11.0-rc2-next-20240805-default+ #76 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 04/01/2014 Workqueue: btrfs-endio btrfs_end_bio_work [btrfs] Call Trace: dump_stack_lvl+0x61/0x80 print_address_description.constprop.0+0x5e/0x2f0 print_report+0x118/0x216 kasan_report+0x11d/0x1f0 btrfs_check_read_bio+0xa68/0xb70 [btrfs] process_one_work+0xce0/0x12a0 worker_thread+0x717/0x1250 kthread+0x2e3/0x3c0 ret_from_fork+0x2d/0x70 ret_from_fork_asm+0x11/0x20 Allocated by task 20917: kasan_save_stack+0x37/0x60 kasan_save_track+0x10/0x30 __kasan_slab_alloc+0x7d/0x80 kmem_cache_alloc_noprof+0x16e/0x3e0 mempool_alloc_noprof+0x12e/0x310 bio_alloc_bioset+0x3f0/0x7a0 btrfs_bio_alloc+0x2e/0x50 [btrfs] submit_extent_page+0x4d1/0xdb0 [btrfs] btrfs_do_readpage+0x8b4/0x12a0 [btrfs] btrfs_readahead+0x29a/0x430 [btrfs] read_pages+0x1a7/0xc60 page_cache_ra_unbounded+0x2ad/0x560 filemap_get_pages+0x629/0xa20 filemap_read+0x335/0xbf0 vfs_read+0x790/0xcb0 ksys_read+0xfd/0x1d0 do_syscall_64+0x6d/0x140 entry_SYSCALL_64_after_hwframe+0x4b/0x53 Freed by task 20917: kasan_save_stack+0x37/0x60 kasan_save_track+0x10/0x30 kasan_save_free_info+0x37/0x50 __kasan_slab_free+0x4b/0x60 kmem_cache_free+0x214/0x5d0 bio_free+0xed/0x180 end_bbio_data_read+0x1cc/0x580 [btrfs] btrfs_submit_chunk+0x98d/0x1880 [btrfs] btrfs_submit_bio+0x33/0x70 [btrfs] submit_one_bio+0xd4/0x130 [btrfs] submit_extent_page+0x3ea/0xdb0 [btrfs] btrfs_do_readpage+0x8b4/0x12a0 [btrfs] btrfs_readahead+0x29a/0x430 [btrfs] read_pages+0x1a7/0xc60 page_cache_ra_unbounded+0x2ad/0x560 filemap_get_pages+0x629/0xa20 filemap_read+0x335/0xbf0 vfs_read+0x790/0xcb0 ksys_read+0xfd/0x1d0 do_syscall_64+0x6d/0x140 entry_SYSCALL_64_after_hwframe+0x4b/0x53[CAUSE]Although I cannot reproduce the error, the report itself is good enoughto pin down the cause.The call trace is the regular endio workqueue context, but thefree-by-task trace is showing that during btrfs_submit_chunk() wealready hit a critical error, and is calling btrfs_bio_end_io() to errorout. And the original endio function called bio_put() to free the wholebio.This means a double freeing thus causing use-after-free, e.g.:1. Enter btrfs_submit_bio() with a read bio The read bio length is 128K, crossing two 64K stripes.2. The first run of btrfs_submit_chunk()2.1 Call btrfs_map_block(), which returns 64K2.2 Call btrfs_split_bio() Now there are two bios, one referring to the first 64K, the other referring to the second 64K.2.3 The first half is submitted.3. The second run of btrfs_submit_chunk()3.1 Call btrfs_map_block(), which by somehow failed Now we call btrfs_bio_end_io() to handle the error3.2 btrfs_bio_end_io() calls the original endio function Which is end_bbio_data_read(), and it calls bio_put() for the original bio. Now the original bio is freed.4. The submitted first 64K bio finished Now we call into btrfs_check_read_bio() and tries to advance the bio iter. But since the original bio (thus its iter) is already freed, we trigger the above use-after free. And even if the memory is not poisoned/corrupted, we will later call the original endio function, causing a double freeing.[FIX]Instead of calling btrfs_bio_end_io(), call btrfs_orig_bbio_end_io(),which has the extra check on split bios and do the pr---truncated---", "category":"general", "title":"Synopsis" } ], "publisher":{ "issuing_authority":"openEuler security committee", "name":"openEuler", "namespace":"https://www.openeuler.org", "contact_details":"openeuler-security@openeuler.org", "category":"vendor" }, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2024-46687" }, { "summary":"CVE-2024-46687 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2024/csaf-openeuler-cve-2024-46687.json" }, { "summary":"openEuler-SA-2024-2181", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-2181" }, { "summary":"CVE-2024-46687", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2024-46687&packageName=kernel" } ], "title":"openEuler cve CVE-2024-46687", "tracking":{ "initial_release_date":"2024-09-27T19:46:56+08:00", "revision_history":[ { "date":"2024-09-27T19:46:56+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2024-09-27T19:46:56+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2024-09-27T19:46:56+08:00", "id":"CVE-2024-46687", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:24.03-LTS" }, "product_id":"openEuler-24.03-LTS", "name":"openEuler-24.03-LTS" }, "name":"openEuler-24.03-LTS", "category":"product_version" } ], "category":"product_name" }, { "name":"aarch64", "branches":[ { "product":{ 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is an internal report that KASAN is reporting use-after-free, withthe following backtrace: BUG: KASAN: slab-use-after-free in btrfs_check_read_bio+0xa68/0xb70 [btrfs] Read of size 4 at addr ffff8881117cec28 by task kworker/u16:2/45 CPU: 1 UID: 0 PID: 45 Comm: kworker/u16:2 Not tainted 6.11.0-rc2-next-20240805-default+ #76 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-3-gd478f380-rebuilt.opensuse.org 04/01/2014 Workqueue: btrfs-endio btrfs_end_bio_work [btrfs] Call Trace: dump_stack_lvl+0x61/0x80 print_address_description.constprop.0+0x5e/0x2f0 print_report+0x118/0x216 kasan_report+0x11d/0x1f0 btrfs_check_read_bio+0xa68/0xb70 [btrfs] process_one_work+0xce0/0x12a0 worker_thread+0x717/0x1250 kthread+0x2e3/0x3c0 ret_from_fork+0x2d/0x70 ret_from_fork_asm+0x11/0x20 Allocated by task 20917: kasan_save_stack+0x37/0x60 kasan_save_track+0x10/0x30 __kasan_slab_alloc+0x7d/0x80 kmem_cache_alloc_noprof+0x16e/0x3e0 mempool_alloc_noprof+0x12e/0x310 bio_alloc_bioset+0x3f0/0x7a0 btrfs_bio_alloc+0x2e/0x50 [btrfs] submit_extent_page+0x4d1/0xdb0 [btrfs] btrfs_do_readpage+0x8b4/0x12a0 [btrfs] btrfs_readahead+0x29a/0x430 [btrfs] read_pages+0x1a7/0xc60 page_cache_ra_unbounded+0x2ad/0x560 filemap_get_pages+0x629/0xa20 filemap_read+0x335/0xbf0 vfs_read+0x790/0xcb0 ksys_read+0xfd/0x1d0 do_syscall_64+0x6d/0x140 entry_SYSCALL_64_after_hwframe+0x4b/0x53 Freed by task 20917: kasan_save_stack+0x37/0x60 kasan_save_track+0x10/0x30 kasan_save_free_info+0x37/0x50 __kasan_slab_free+0x4b/0x60 kmem_cache_free+0x214/0x5d0 bio_free+0xed/0x180 end_bbio_data_read+0x1cc/0x580 [btrfs] btrfs_submit_chunk+0x98d/0x1880 [btrfs] btrfs_submit_bio+0x33/0x70 [btrfs] submit_one_bio+0xd4/0x130 [btrfs] submit_extent_page+0x3ea/0xdb0 [btrfs] btrfs_do_readpage+0x8b4/0x12a0 [btrfs] btrfs_readahead+0x29a/0x430 [btrfs] read_pages+0x1a7/0xc60 page_cache_ra_unbounded+0x2ad/0x560 filemap_get_pages+0x629/0xa20 filemap_read+0x335/0xbf0 vfs_read+0x790/0xcb0 ksys_read+0xfd/0x1d0 do_syscall_64+0x6d/0x140 entry_SYSCALL_64_after_hwframe+0x4b/0x53[CAUSE]Although I cannot reproduce the error, the report itself is good enoughto pin down the cause.The call trace is the regular endio workqueue context, but thefree-by-task trace is showing that during btrfs_submit_chunk() wealready hit a critical error, and is calling btrfs_bio_end_io() to errorout. And the original endio function called bio_put() to free the wholebio.This means a double freeing thus causing use-after-free, e.g.:1. Enter btrfs_submit_bio() with a read bio The read bio length is 128K, crossing two 64K stripes.2. The first run of btrfs_submit_chunk()2.1 Call btrfs_map_block(), which returns 64K2.2 Call btrfs_split_bio() Now there are two bios, one referring to the first 64K, the other referring to the second 64K.2.3 The first half is submitted.3. The second run of btrfs_submit_chunk()3.1 Call btrfs_map_block(), which by somehow failed Now we call btrfs_bio_end_io() to handle the error3.2 btrfs_bio_end_io() calls the original endio function Which is end_bbio_data_read(), and it calls bio_put() for the original bio. Now the original bio is freed.4. The submitted first 64K bio finished Now we call into btrfs_check_read_bio() and tries to advance the bio iter. But since the original bio (thus its iter) is already freed, we trigger the above use-after free. And even if the memory is not poisoned/corrupted, we will later call the original endio function, causing a double freeing.[FIX]Instead of calling btrfs_bio_end_io(), call btrfs_orig_bbio_end_io(),which has the extra check on split bios and do the pr---truncated---", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-24.03-LTS:bpftool-6.6.0-44.0.0.50.oe2403.aarch64", "openEuler-24.03-LTS:bpftool-debuginfo-6.6.0-44.0.0.50.oe2403.aarch64", "openEuler-24.03-LTS:kernel-6.6.0-44.0.0.50.oe2403.aarch64", "openEuler-24.03-LTS:kernel-debuginfo-6.6.0-44.0.0.50.oe2403.aarch64", "openEuler-24.03-LTS:kernel-debugsource-6.6.0-44.0.0.50.oe2403.aarch64", "openEuler-24.03-LTS:kernel-devel-6.6.0-44.0.0.50.oe2403.aarch64", "openEuler-24.03-LTS:kernel-headers-6.6.0-44.0.0.50.oe2403.aarch64", "openEuler-24.03-LTS:kernel-source-6.6.0-44.0.0.50.oe2403.aarch64", "openEuler-24.03-LTS:kernel-tools-6.6.0-44.0.0.50.oe2403.aarch64", 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