In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
drm\/nouveau: don’t bump pin count on failed re-pin in nouveau_bo_pin_locked()<\/p>\n
nouveau_bo_pin_locked() checks whether an already pinned BO is in a
\nmemory domain compatible with a new pin request. When the domains are
\nincompatible, it sets -EBUSY but still calls ttm_bo_pin() before
\nreturning.<\/p>\n
Callers treat a failed nouveau_bo_pin() as not having acquired a new pin,
\nso the extra pin count is never decreased by a matching unpin.
\nThis triggers the warning in ttm_bo_release():<\/p>\n
\tWARN_ON_ONCE(bo->pin_count);<\/p>\n
Found when fuzzing the nouveau driver with a modified Syzkaller:<\/p>\n
\tWARNING: drivers\/gpu\/drm\/ttm\/ttm_bo.c:256 at ttm_bo_release+0x827\/0x9e0 drivers\/gpu\/drm\/ttm\/ttm_bo.c:256, CPU#1: syz.3.24\/2212
\n\tModules linked in:
\n\tCPU: 1 UID: 0 PID: 2212 Comm: syz.3.24 Not tainted 7.2.0 #24 PREEMPT(lazy)
\n\tnouveau 0000:01:00.0: gsp:msg fn:103 len:0x40\/0x20 res:0x19 resp:0x19
\n\tHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04\/01\/2014
\n\tRIP: 0010:ttm_bo_release+0x827\/0x9e0 drivers\/gpu\/drm\/ttm\/ttm_bo.c:256
\n\tCode: 02 00 0f 85 51 01 00 00 48 8b 7b 08 e8 d2 20 01 00 e9 80 fd ff ff e8 d8 15 c0 fe 90 0f 0b 90 e9 e1 f8 ff ff e8 ca 15 c0 fe 90 0b 90 e9 a4 f8 ff ff e8 bc 15 c0 fe be 03 00 00 00 4c 89 e7 e8
\n\tmsg: 00000000: 05 00 d0 c1 04 00 f0 f1 01 30 00 00 2d 90 00 00 ………0..-…
\n\tRSP: 0018:ffffc9000f5cf710 EFLAGS: 00010293
\n\tRAX: 0000000000000000 RBX: ffff888018e5d2a8 RCX: ffffffff82bb1b36
\n\tRDX: ffff888017b68000 RSI: 0000000000000004 RDI: ffff888018e5d2a8
\n\tmsg: 00000010: 19 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 …………….
\n\tRBP: ffff88801261c720 R08: 0000000000000001 R09: ffffed10031cba55
\n\tR10: ffff888018e5d2ab R11: 00000000000000f3 R12: ffff888018e5d290
\n\tR13: ffff888018e5d2d4 R14: ffff88801b219c18 R15: dffffc0000000000
\n\tFS: 0000000000000000(0000) GS:ffff8880e0f6f000(0000) knlGS:0000000000000000
\n\tCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
\n\tCR2: 0000001b31223ffc CR3: 0000000028e00005 CR4: 0000000000770ef0
\n\tPKRU: 80000000
\n\tCall Trace:<\/p>\n
\tkref_put include\/linux\/kref.h:65 [inline]
\n\tttm_bo_put drivers\/gpu\/drm\/ttm\/ttm_bo.c:325 [inline]
\n\tttm_bo_fini+0x55\/0x80 drivers\/gpu\/drm\/ttm\/ttm_bo.c:330
\n\tnouveau_gem_object_del+0xb2\/0x1b0 drivers\/gpu\/drm\/nouveau\/nouveau_gem.c:90
\n\tdrm_gem_object_free+0x5f\/0x90 drivers\/gpu\/drm\/drm_gem.c:1165
\n\tkref_put include\/linux\/kref.h:65 [inline]
\n\t__drm_gem_object_put include\/drm\/drm_gem.h:562 [inline]
\n\tdrm_gem_object_put include\/drm\/drm_gem.h:575 [inline]
\n\tnouveau_abi16_chan_fini.constprop.0+0x44f\/0x5a0 drivers\/gpu\/drm\/nouveau\/nouveau_abi16.c:195
\n\tnouveau 0000:01:00.0: syz.2.23[2209]: Unknown handle 0x00000000
\n\tnouveau_abi16_fini+0x1d0\/0x340 drivers\/gpu\/drm\/nouveau\/nouveau_abi16.c:225
\n\tnouveau_drm_postclose+0x18b\/0x3e0 drivers\/gpu\/drm\/nouveau\/nouveau_drm.c:1284
\n\tnouveau 0000:01:00.0: syz.2.23[2209]: validate_init
\n\tdrm_file_free.part.0+0x6d6\/0xb60 drivers\/gpu\/drm\/drm_file.c:267
\n\tdrm_file_free drivers\/gpu\/drm\/drm_file.c:237 [inline]
\n\tdrm_close_helper.isra.0+0x11a\/0x160 drivers\/gpu\/drm\/drm_file.c:290
\n\tdrm_release+0x1ab\/0x330 drivers\/gpu\/drm\/drm_file.c:438
\n\t__fput+0x39c\/0xa60 fs\/file_table.c:512
\n\tnouveau 0000:01:00.0: syz.2.23[2209]: validate: -2
\n\ttask_work_run+0x15a\/0x230 kernel\/task_work.c:233
\n\texit_task_work include\/linux\/task_work.h:40 [inline]
\n\tdo_exit+0x82b\/0x25a0 kernel\/exit.c:1009
\n\tdo_group_exit+0xc2\/0x280 kernel\/exit.c:1152
\n\tget_signal+0x1d6e\/0x1f30 kernel\/signal.c:3046
\n\tarch_do_signal_or_restart+0x7d\/0x6e0 arch\/x86\/kernel\/signal.c:337
\n\t__exit_to_user_mode_loop kernel\/entry\/common.c:66 [inline]
\n\texit_to_user_mode_loop+0xdf\/0x440 kernel\/entry\/common.c:101
\n\t__exit_to_user_mode_prepare include\/linux\/irq-entry-common.h:207 [inline]
\n\tsyscall_exit_to_user_mode_prepare include\/linux\/irq-entry-common.h:230 [inline]
\n\tsyscall_exit_to_user_mode include\/linux\/entry-common.h:318 [inline]
\n\tdo_syscall_64+0x4f8\/0x690 arch\/x86\/entry\/syscall_64.c:100
\n\tentry_SYSCALL_64_after_hwframe+0x77\/0x7f
\n\tRI
\n—truncated—<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
drm\/nouveau: don’t bump pin count on failed re-pin in nouveau_bo_pin_locked()<\/p>\n
nouveau_bo_pin_locked() checks whether an already pi<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-40983","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/40983","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=40983"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=40983"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=40983"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}