| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-49903: jfs: Fix uaf in dbFreeBits |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| jfs: Fix uaf in dbFreeBits |
| |
| [syzbot reported] |
| ================================================================== |
| BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:587 [inline] |
| BUG: KASAN: slab-use-after-free in __mutex_lock+0xfe/0xd70 kernel/locking/mutex.c:752 |
| Read of size 8 at addr ffff8880229254b0 by task syz-executor357/5216 |
| |
| CPU: 0 UID: 0 PID: 5216 Comm: syz-executor357 Not tainted 6.11.0-rc3-syzkaller-00156-gd7a5aa4b3c00 #0 |
| Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 |
| Call Trace: |
| <TASK> |
| __dump_stack lib/dump_stack.c:93 [inline] |
| dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 |
| print_address_description mm/kasan/report.c:377 [inline] |
| print_report+0x169/0x550 mm/kasan/report.c:488 |
| kasan_report+0x143/0x180 mm/kasan/report.c:601 |
| __mutex_lock_common kernel/locking/mutex.c:587 [inline] |
| __mutex_lock+0xfe/0xd70 kernel/locking/mutex.c:752 |
| dbFreeBits+0x7ea/0xd90 fs/jfs/jfs_dmap.c:2390 |
| dbFreeDmap fs/jfs/jfs_dmap.c:2089 [inline] |
| dbFree+0x35b/0x680 fs/jfs/jfs_dmap.c:409 |
| dbDiscardAG+0x8a9/0xa20 fs/jfs/jfs_dmap.c:1650 |
| jfs_ioc_trim+0x433/0x670 fs/jfs/jfs_discard.c:100 |
| jfs_ioctl+0x2d0/0x3e0 fs/jfs/ioctl.c:131 |
| vfs_ioctl fs/ioctl.c:51 [inline] |
| __do_sys_ioctl fs/ioctl.c:907 [inline] |
| __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 |
| do_syscall_x64 arch/x86/entry/common.c:52 [inline] |
| do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 |
| |
| Freed by task 5218: |
| kasan_save_stack mm/kasan/common.c:47 [inline] |
| kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 |
| kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 |
| poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 |
| __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 |
| kasan_slab_free include/linux/kasan.h:184 [inline] |
| slab_free_hook mm/slub.c:2252 [inline] |
| slab_free mm/slub.c:4473 [inline] |
| kfree+0x149/0x360 mm/slub.c:4594 |
| dbUnmount+0x11d/0x190 fs/jfs/jfs_dmap.c:278 |
| jfs_mount_rw+0x4ac/0x6a0 fs/jfs/jfs_mount.c:247 |
| jfs_remount+0x3d1/0x6b0 fs/jfs/super.c:454 |
| reconfigure_super+0x445/0x880 fs/super.c:1083 |
| vfs_cmd_reconfigure fs/fsopen.c:263 [inline] |
| vfs_fsconfig_locked fs/fsopen.c:292 [inline] |
| __do_sys_fsconfig fs/fsopen.c:473 [inline] |
| __se_sys_fsconfig+0xb6e/0xf80 fs/fsopen.c:345 |
| do_syscall_x64 arch/x86/entry/common.c:52 [inline] |
| do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 |
| entry_SYSCALL_64_after_hwframe+0x77/0x7f |
| |
| [Analysis] |
| There are two paths (dbUnmount and jfs_ioc_trim) that generate race |
| condition when accessing bmap, which leads to the occurrence of uaf. |
| |
| Use the lock s_umount to synchronize them, in order to avoid uaf caused |
| by race condition. |
| |
| The Linux kernel CVE team has assigned CVE-2024-49903 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.19.323 with commit 4ac58f7734937f3249da734ede946dfb3b1af5e4 |
| Fixed in 5.4.285 with commit 3126ccde51f51b0648c8cdccaf916e8bd062e972 |
| Fixed in 5.10.227 with commit fd026b6b6758d5569705c02540b40f3bbf822b9a |
| Fixed in 5.15.168 with commit e7ae14f7ee76c6ef5a48aebab1a278ad78f42619 |
| Fixed in 6.1.113 with commit 0c238da83f56bb895cab1e5851d034ac45b158d1 |
| Fixed in 6.6.55 with commit 4218b31ecc7af7e191768d32e32ed4386d8f9b76 |
| Fixed in 6.10.14 with commit a9603a6f75df2fd8125cd208c98cfaa0fe3f7505 |
| Fixed in 6.11.3 with commit 95accb7183badca387f7a8d19a2475cf3089f148 |
| Fixed in 6.12 with commit d6c1b3599b2feb5c7291f5ac3a36e5fa7cedb234 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2024-49903 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| fs/jfs/jfs_discard.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/4ac58f7734937f3249da734ede946dfb3b1af5e4 |
| https://git.kernel.org/stable/c/3126ccde51f51b0648c8cdccaf916e8bd062e972 |
| https://git.kernel.org/stable/c/fd026b6b6758d5569705c02540b40f3bbf822b9a |
| https://git.kernel.org/stable/c/e7ae14f7ee76c6ef5a48aebab1a278ad78f42619 |
| https://git.kernel.org/stable/c/0c238da83f56bb895cab1e5851d034ac45b158d1 |
| https://git.kernel.org/stable/c/4218b31ecc7af7e191768d32e32ed4386d8f9b76 |
| https://git.kernel.org/stable/c/a9603a6f75df2fd8125cd208c98cfaa0fe3f7505 |
| https://git.kernel.org/stable/c/95accb7183badca387f7a8d19a2475cf3089f148 |
| https://git.kernel.org/stable/c/d6c1b3599b2feb5c7291f5ac3a36e5fa7cedb234 |
