CVSS: -EPSS: 0%CPEs: 2EXPL: 0CVE-2024-26658 – bcachefs: grab s_umount only if snapshotting
https://notcve.org/view.php?id=CVE-2024-26658
In the Linux kernel, the following vulnerability has been resolved: bcachefs: grab s_umount only if snapshotting When I was testing mongodb over bcachefs with compression, there is a lockdep warning when snapshotting mongodb data volume. $ cat test.sh prog=bcachefs $prog subvolume create /mnt/data $prog subvolume create /mnt/data/snapshots while true;do $prog subvolume snapshot /mnt/data /mnt/data/snapshots/$(date +%s) sleep 1s done $ cat /etc/mongodb.conf systemLog: destination: file logAppend: true path: /mnt/data/mongod.log storage: dbPath: /mnt/data/ lockdep reports: [ 3437.452330] ====================================================== [ 3437.452750] WARNING: possible circular locking dependency detected [ 3437.453168] 6.7.0-rc7-custom+ #85 Tainted: G E [ 3437.453562] ------------------------------------------------------ [ 3437.453981] bcachefs/35533 is trying to acquire lock: [ 3437.454325] ffffa0a02b2b1418 (sb_writers#10){.+.+}-{0:0}, at: filename_create+0x62/0x190 [ 3437.454875] but task is already holding lock: [ 3437.455268] ffffa0a02b2b10e0 (&type->s_umount_key#48){.+.+}-{3:3}, at: bch2_fs_file_ioctl+0x232/0xc90 [bcachefs] [ 3437.456009] which lock already depends on the new lock. [ 3437.456553] the existing dependency chain (in reverse order) is: [ 3437.457054] -> #3 (&type->s_umount_key#48){.+.+}-{3:3}: [ 3437.457507] down_read+0x3e/0x170 [ 3437.457772] bch2_fs_file_ioctl+0x232/0xc90 [bcachefs] [ 3437.458206] __x64_sys_ioctl+0x93/0xd0 [ 3437.458498] do_syscall_64+0x42/0xf0 [ 3437.458779] entry_SYSCALL_64_after_hwframe+0x6e/0x76 [ 3437.459155] -> #2 (&c->snapshot_create_lock){++++}-{3:3}: [ 3437.459615] down_read+0x3e/0x170 [ 3437.459878] bch2_truncate+0x82/0x110 [bcachefs] [ 3437.460276] bchfs_truncate+0x254/0x3c0 [bcachefs] [ 3437.460686] notify_change+0x1f1/0x4a0 [ 3437.461283] do_truncate+0x7f/0xd0 [ 3437.461555] path_openat+0xa57/0xce0 [ 3437.461836] do_filp_open+0xb4/0x160 [ 3437.462116] do_sys_openat2+0x91/0xc0 [ 3437.462402] __x64_sys_openat+0x53/0xa0 [ 3437.462701] do_syscall_64+0x42/0xf0 [ 3437.462982] entry_SYSCALL_64_after_hwframe+0x6e/0x76 [ 3437.463359] -> #1 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}: [ 3437.463843] down_write+0x3b/0xc0 [ 3437.464223] bch2_write_iter+0x5b/0xcc0 [bcachefs] [ 3437.464493] vfs_write+0x21b/0x4c0 [ 3437.464653] ksys_write+0x69/0xf0 [ 3437.464839] do_syscall_64+0x42/0xf0 [ 3437.465009] entry_SYSCALL_64_after_hwframe+0x6e/0x76 [ 3437.465231] -> #0 (sb_writers#10){.+.+}-{0:0}: [ 3437.465471] __lock_acquire+0x1455/0x21b0 [ 3437.465656] lock_acquire+0xc6/0x2b0 [ 3437.465822] mnt_want_write+0x46/0x1a0 [ 3437.465996] filename_create+0x62/0x190 [ 3437.466175] user_path_create+0x2d/0x50 [ 3437.466352] bch2_fs_file_ioctl+0x2ec/0xc90 [bcachefs] [ 3437.466617] __x64_sys_ioctl+0x93/0xd0 [ 3437.466791] do_syscall_64+0x42/0xf0 [ 3437.466957] entry_SYSCALL_64_after_hwframe+0x6e/0x76 [ 3437.467180] other info that might help us debug this: [ 3437.469670] 2 locks held by bcachefs/35533: other info that might help us debug this: [ 3437.467507] Chain exists of: sb_writers#10 --> &c->snapshot_create_lock --> &type->s_umount_key#48 [ 3437.467979] Possible unsafe locking scenario: [ 3437.468223] CPU0 CPU1 [ 3437.468405] ---- ---- [ 3437.468585] rlock(&type->s_umount_key#48); [ 3437.468758] lock(&c->snapshot_create_lock); [ 3437.469030] lock(&type->s_umount_key#48); [ 3437.469291] rlock(sb_writers#10); [ 3437.469434] *** DEADLOCK *** [ 3437.469 ---truncated--- En el kernel de Linux, se resolvió la siguiente vulnerabilidad: bcachefs: toma s_umount solo si se toma una instantánea Cuando estaba probando mongodb sobre bcachefs con compresión, hay una advertencia de lockdep al tomar una instantánea del volumen de datos de mongodb. $ cat test.sh prog=bcachefs $prog subvolumen crear /mnt/data $prog subvolumen crear /mnt/data/snapshots mientras es verdadero;do $prog subvolumen snapshot /mnt/data /mnt/data/snapshots/$(fecha +% s) dormir 1 hecho $ cat /etc/mongodb.conf systemLog: destino: archivo logAppend: verdadera ruta: /mnt/data/mongod.log almacenamiento: dbPath: /mnt/data/ lockdep informes: [3437.452330] ==== ==================================================== [ 3437.452750] ADVERTENCIA: posible dependencia de bloqueo circular detectada [ 3437.453168] 6.7.0-rc7-custom+ #85 Contaminado: GE [ 3437.453562] ---------------------- -------------------------------- [ 3437.453981] bcachefs/35533 está intentando adquirir el bloqueo: [ 3437.454325] ffffa0a02b2b1418 (sb_writers #10){.+.+}-{0:0}, en: filename_create+0x62/0x190 [ 3437.454875] pero la tarea ya mantiene el bloqueo: [ 3437.455268] ffffa0a02b2b10e0 (&type->s_umount_key#48){.+.+ }-{3:3}, en: bch2_fs_file_ioctl+0x232/0xc90 [bcachefs] [ 3437.456009] cuyo bloqueo ya depende del nuevo bloqueo. [ 3437.456553] la cadena de dependencia existente (en orden inverso) es: [ 3437.457054] -> #3 (&type->s_umount_key#48){.+.+}-{3:3}: [ 3437.457507] down_read+0x3e/0x170 [ 3437.457772] bch2_fs_file_ioctl+0x232/0xc90 [bcachefs] [ 3437.458206] __x64_sys_ioctl+0x93/0xd0 [ 3437.458498] do_syscall_64+0x42/0xf0 [ 3437.458 779] Entry_SYSCALL_64_after_hwframe+0x6e/0x76 [3437.459155] -> #2 (&c->snapshot_create_lock){+ +++}-{3:3}: [ 3437.459615] down_read+0x3e/0x170 [ 3437.459878] bch2_truncate+0x82/0x110 [bcachefs] [ 3437.460276] bchfs_truncate+0x254/0x3c0 [bcachefs] [ 3437.4 60686] notificar_cambio+0x1f1/0x4a0 [ 3437.461283] do_truncate+0x7f/0xd0 [ 3437.461555] path_openat+0xa57/0xce0 [ 3437.461836] do_filp_open+0xb4/0x160 [ 3437.462116] do_sys_openat2+0x91/0xc0 [ 34 37.462402] __x64_sys_openat+0x53/0xa0 [ 3437.462701] do_syscall_64+0x42/0xf0 [ 3437.462982] Entry_SYSCALL_64_after_hwframe+0x6e/0x76 [ 3437.463359] -> #1 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}: [ 3437.463843] down_write+0x3b/0xc0 [ 3437.464223] bch2_write_it e+0x5b /0xcc0 [bcachefs] [ 3437.464493] vfs_write+0x21b/0x4c0 [ 3437.464653] ksys_write+0x69/0xf0 [ 3437.464839] do_syscall_64+0x42/0xf0 [ 3437.465009] entrada_SYSCALL _64_after_hwframe+0x6e/0x76 [ 3437.465231] -> #0 (sb_writers#10){ .+.+}-{0:0}: [ 3437.465471] __lock_acquire+0x1455/0x21b0 [ 3437.465656] lock_acquire+0xc6/0x2b0 [ 3437.465822] mnt_want_write+0x46/0x1a0 [ 3437.465996] nombre de archivo _create+0x62/0x190 [ 3437.466175] ruta_usuario_create+0x2d /0x50 [ 3437.466352] bch2_fs_file_ioctl+0x2ec/0xc90 [bcachefs] [ 3437.466617] __x64_sys_ioctl+0x93/0xd0 [ 3437.466791] do_syscall_64+0x42/0xf0 [ 3437 .466957] Entry_SYSCALL_64_after_hwframe+0x6e/0x76 [ 3437.467180] otra información que podría ayudarnos a depurar esto: [ 3437.469670] 2 bloqueos mantenidos por bcachefs/35533: otra información que podría ayudarnos a depurar esto: [3437.467507] Existe cadena de: sb_writers#10 --> &c->snapshot_create_lock --> &type->s_umount_key#48 [3437.467979] Posiblemente inseguro escenario de bloqueo: [3437.468223] CPU0 CPU1 [3437.468405] ---- ---- [3437.468585] rlock(&type->s_umount_key#48); [ 3437.468758] bloqueo(&c->snapshot_create_lock); [ 3437.469030] bloqueo(&type->s_umount_key#48); [3437.469291] rlock(sb_writers#10); [ 3437.469434] *** INTERBLOQUEO *** [ 3437.469 ---truncado--- • https://git.kernel.org/stable/c/5b41d3fd04c6757b9c2a60a0c5b2609cae9999df https://git.kernel.org/stable/c/2acc59dd88d27ad69b66ded80df16c042b04eeec •
CVSS: 4.7EPSS: 0%CPEs: 4EXPL: 0CVE-2024-26656 – drm/amdgpu: fix use-after-free bug
https://notcve.org/view.php?id=CVE-2024-26656
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: fix use-after-free bug The bug can be triggered by sending a single amdgpu_gem_userptr_ioctl to the AMDGPU DRM driver on any ASICs with an invalid address and size. The bug was reported by Joonkyo Jung <joonkyoj@yonsei.ac.kr>. For example the following code: static void Syzkaller1(int fd) { struct drm_amdgpu_gem_userptr arg; int ret; arg.addr = 0xffffffffffff0000; arg.size = 0x80000000; /*2 Gb*/ arg.flags = 0x7; ret = drmIoctl(fd, 0xc1186451/*amdgpu_gem_userptr_ioctl*/, &arg); } Due to the address and size are not valid there is a failure in amdgpu_hmm_register->mmu_interval_notifier_insert->__mmu_interval_notifier_insert-> check_shl_overflow, but we even the amdgpu_hmm_register failure we still call amdgpu_hmm_unregister into amdgpu_gem_object_free which causes access to a bad address. The following stack is below when the issue is reproduced when Kazan is enabled: [ +0.000014] Hardware name: ASUS System Product Name/ROG STRIX B550-F GAMING (WI-FI), BIOS 1401 12/03/2020 [ +0.000009] RIP: 0010:mmu_interval_notifier_remove+0x327/0x340 [ +0.000017] Code: ff ff 49 89 44 24 08 48 b8 00 01 00 00 00 00 ad de 4c 89 f7 49 89 47 40 48 83 c0 22 49 89 47 48 e8 ce d1 2d 01 e9 32 ff ff ff <0f> 0b e9 16 ff ff ff 4c 89 ef e8 fa 14 b3 ff e9 36 ff ff ff e8 80 [ +0.000014] RSP: 0018:ffffc90002657988 EFLAGS: 00010246 [ +0.000013] RAX: 0000000000000000 RBX: 1ffff920004caf35 RCX: ffffffff8160565b [ +0.000011] RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffff8881a9f78260 [ +0.000010] RBP: ffffc90002657a70 R08: 0000000000000001 R09: fffff520004caf25 [ +0.000010] R10: 0000000000000003 R11: ffffffff8161d1d6 R12: ffff88810e988c00 [ +0.000010] R13: ffff888126fb5a00 R14: ffff88810e988c0c R15: ffff8881a9f78260 [ +0.000011] FS: 00007ff9ec848540(0000) GS:ffff8883cc880000(0000) knlGS:0000000000000000 [ +0.000012] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ +0.000010] CR2: 000055b3f7e14328 CR3: 00000001b5770000 CR4: 0000000000350ef0 [ +0.000010] Call Trace: [ +0.000006] <TASK> [ +0.000007] ? show_regs+0x6a/0x80 [ +0.000018] ? __warn+0xa5/0x1b0 [ +0.000019] ? mmu_interval_notifier_remove+0x327/0x340 [ +0.000018] ? report_bug+0x24a/0x290 [ +0.000022] ? • https://git.kernel.org/stable/c/e87e08c94c9541b4e18c4c13f2f605935f512605 https://git.kernel.org/stable/c/af054a5fb24a144f99895afce9519d709891894c https://git.kernel.org/stable/c/22f665ecfd1225afa1309ace623157d12bb9bb0c https://git.kernel.org/stable/c/22207fd5c80177b860279653d017474b2812af5e https://access.redhat.com/security/cve/CVE-2024-26656 https://bugzilla.redhat.com/show_bug.cgi?id=2272692 • CWE-416: Use After Free •
CVSS: -EPSS: 0%CPEs: 9EXPL: 0CVE-2024-26654 – ALSA: sh: aica: reorder cleanup operations to avoid UAF bugs
https://notcve.org/view.php?id=CVE-2024-26654
In the Linux kernel, the following vulnerability has been resolved: ALSA: sh: aica: reorder cleanup operations to avoid UAF bugs The dreamcastcard->timer could schedule the spu_dma_work and the spu_dma_work could also arm the dreamcastcard->timer. When the snd_pcm_substream is closing, the aica_channel will be deallocated. But it could still be dereferenced in the worker thread. The reason is that del_timer() will return directly regardless of whether the timer handler is running or not and the worker could be rescheduled in the timer handler. As a result, the UAF bug will happen. The racy situation is shown below: (Thread 1) | (Thread 2) snd_aicapcm_pcm_close() | • https://git.kernel.org/stable/c/198de43d758ca2700e2b52b49c0b189b4931466c https://git.kernel.org/stable/c/eeb2a2ca0b8de7e1c66afaf719529154e7dc60b2 https://git.kernel.org/stable/c/4206ad65a0ee76920041a755bd3c17c6ba59bba2 https://git.kernel.org/stable/c/aa39e6878f61f50892ee2dd9d2176f72020be845 https://git.kernel.org/stable/c/8c990221681688da34295d6d76cc2f5b963e83f5 https://git.kernel.org/stable/c/9d66ae0e7bb78b54e1e0525456c6b54e1d132046 https://git.kernel.org/stable/c/61d4787692c1fccdc268ffa7a891f9c149f50901 https://git.kernel.org/stable/c/e955e8a7f38a856fc6534ba4e6bffd4d5 •
CVSS: 8.4EPSS: 0%CPEs: 2EXPL: 0CVE-2023-52629 – sh: push-switch: Reorder cleanup operations to avoid use-after-free bug
https://notcve.org/view.php?id=CVE-2023-52629
In the Linux kernel, the following vulnerability has been resolved: sh: push-switch: Reorder cleanup operations to avoid use-after-free bug The original code puts flush_work() before timer_shutdown_sync() in switch_drv_remove(). Although we use flush_work() to stop the worker, it could be rescheduled in switch_timer(). As a result, a use-after-free bug can occur. The details are shown below: (cpu 0) | (cpu 1) switch_drv_remove() | flush_work() | . • https://git.kernel.org/stable/c/9f5e8eee5cfe1328660c71812d87c2a67bda389f https://git.kernel.org/stable/c/610dbd8ac271aa36080aac50b928d700ee3fe4de https://git.kernel.org/stable/c/246f80a0b17f8f582b2c0996db02998239057c65 • CWE-416: Use After Free •
CVSS: -EPSS: 0%CPEs: 3EXPL: 0CVE-2024-26648 – drm/amd/display: Fix variable deferencing before NULL check in edp_setup_replay()
https://notcve.org/view.php?id=CVE-2024-26648
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix variable deferencing before NULL check in edp_setup_replay() In edp_setup_replay(), 'struct dc *dc' & 'struct dmub_replay *replay' was dereferenced before the pointer 'link' & 'replay' NULL check. Fixes the below: drivers/gpu/drm/amd/amdgpu/../display/dc/link/protocols/link_edp_panel_control.c:947 edp_setup_replay() warn: variable dereferenced before check 'link' (see line 933) En el kernel de Linux, se resolvió la siguiente vulnerabilidad: drm/amd/display: se corrigió la diferenciación de variables antes de la verificación NULL en edp_setup_replay() En edp_setup_replay(), se eliminó la referencia a 'struct dc *dc' y 'struct dmub_replay *replay' antes de la comprobación NULL del puntero 'enlace' y 'repetición'. Corrige lo siguiente: drivers/gpu/drm/amd/amdgpu/../display/dc/link/protocols/link_edp_panel_control.c:947 edp_setup_replay() advertencia: variable desreferenciada antes de marcar 'enlace' (ver línea 933) • https://git.kernel.org/stable/c/22ae604aea14756954e1c00ae653e34d2afd2935 https://git.kernel.org/stable/c/c02d257c654191ecda1dc1af6875d527e85310e7 https://git.kernel.org/stable/c/7073934f5d73f8b53308963cee36f0d389ea857c •