From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f77.google.com (mail-io1-f77.google.com [209.85.166.77]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CA9817C for ; Fri, 16 Jun 2023 06:01:14 +0000 (UTC) Received: by mail-io1-f77.google.com with SMTP id ca18e2360f4ac-77a1d6d2f7fso28871339f.2 for ; Thu, 15 Jun 2023 23:01:14 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1686895273; x=1689487273; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=KuhMsJImBWZkS4STwMps+fTTdmfKxPPAWibcumrJnTw=; b=VIiH0kXOq4Rjn5X3mmJGo1zAzqr2ZXRW0yShAdymoOZItXc6JFbVGiL051Va2/MjYr cMpK/rlBZJgmTy8OhFgLsIRt079WxGt26qu7NvYKf2UVXb8D9KeltkUvUaebEwyvoXTg CCCutDdbarFjnEkoBqk10bctvnsNsWkjmycGAVx7MtiE7MFAwE730cuqNIiitND4gl+h 0ZW8/vFfgQMU45fpq10EZueqY4iXu3HdBw3o2fA036Z37CZOMJI8yZ+Kjltp3lyTZBvx oHSDTs3/dqR9Cpcxap/Xc8XuZ/gwtgpiH5It5pEAzEN6uPeSd/kSOCCc5VRuy2S5QYSm A39A== X-Gm-Message-State: AC+VfDwl0UL7nXJlPhII/QATgAGUjuBFKdCMwFzY7vWD8MnuulgN+23z vZjhav2f8+LIJyIZ7zYmoDeORnmHA4YgH3odBjeiCJ0XxIkTCG/vvA== X-Google-Smtp-Source: ACHHUZ4Zv7gZoLXBlKgNdxHDzQ8VYsD70jvWV6omTecSakxDyWb6dBr3PyQwmIKbJrVqap1IXaBGA/2L7QhK6wJm5LN9+bX826tm Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a92:d391:0:b0:341:da64:d82d with SMTP id o17-20020a92d391000000b00341da64d82dmr531139ilo.6.1686895273723; Thu, 15 Jun 2023 23:01:13 -0700 (PDT) Date: Thu, 15 Jun 2023 23:01:13 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000905eba05fe38e9f2@google.com> Subject: [syzbot] [iommu?] KASAN: slab-use-after-free Read in iommufd_access_unpin_pages From: syzbot To: iommu@lists.linux.dev, jgg@ziepe.ca, joro@8bytes.org, kevin.tian@intel.com, linux-kernel@vger.kernel.org, robin.murphy@arm.com, syzkaller-bugs@googlegroups.com, will@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 4c605260bc60 Merge tag 'x86_urgent_for_v6.4_rc6' of git://.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14d07943280000 kernel config: https://syzkaller.appspot.com/x/.config?x=3c980bfe8b399968 dashboard link: https://syzkaller.appspot.com/bug?extid=6c8d756f238a75fc3eb8 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=158a29dd280000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=167dd475280000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/9c4a756cb2ce/disk-4c605260.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/321df5350ca6/vmlinux-4c605260.xz kernel image: https://storage.googleapis.com/syzbot-assets/f117647a1dc2/bzImage-4c605260.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6c8d756f238a75fc3eb8@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in iopt_area_last_iova drivers/iommu/iommufd/io_pagetable.h:88 [inline] BUG: KASAN: slab-use-after-free in iopt_area_contig_done drivers/iommu/iommufd/io_pagetable.h:160 [inline] BUG: KASAN: slab-use-after-free in iommufd_access_unpin_pages+0x363/0x370 drivers/iommu/iommufd/device.c:557 Read of size 8 at addr ffff888022286e20 by task syz-executor669/5771 CPU: 0 PID: 5771 Comm: syz-executor669 Not tainted 6.4.0-rc5-syzkaller-00313-g4c605260bc60 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351 print_report mm/kasan/report.c:462 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:572 iopt_area_last_iova drivers/iommu/iommufd/io_pagetable.h:88 [inline] iopt_area_contig_done drivers/iommu/iommufd/io_pagetable.h:160 [inline] iommufd_access_unpin_pages+0x363/0x370 drivers/iommu/iommufd/device.c:557 iommufd_test_access_unmap+0x24b/0x390 drivers/iommu/iommufd/selftest.c:613 iommufd_access_notify_unmap+0x24c/0x3a0 drivers/iommu/iommufd/device.c:520 iopt_unmap_iova_range+0x4c4/0x5f0 drivers/iommu/iommufd/io_pagetable.c:497 iopt_unmap_all+0x27/0x50 drivers/iommu/iommufd/io_pagetable.c:555 iommufd_ioas_unmap+0x3d0/0x490 drivers/iommu/iommufd/ioas.c:300 iommufd_fops_ioctl+0x317/0x4b0 drivers/iommu/iommufd/main.c:337 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fec1dae3b19 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fec1da74308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fec1db6b438 RCX: 00007fec1dae3b19 RDX: 0000000020000100 RSI: 0000000000003b86 RDI: 0000000000000003 RBP: 00007fec1db6b430 R08: 00007fec1da74700 R09: 0000000000000000 R10: 00007fec1da74700 R11: 0000000000000246 R12: 00007fec1db6b43c R13: 00007fec1db39074 R14: 6d6f692f7665642f R15: 0000000000022000 Allocated by task 5770: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] ____kasan_kmalloc mm/kasan/common.c:333 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] iopt_alloc_area_pages+0x94/0x560 drivers/iommu/iommufd/io_pagetable.c:234 iopt_map_pages drivers/iommu/iommufd/io_pagetable.c:339 [inline] iopt_map_user_pages+0x205/0x4e0 drivers/iommu/iommufd/io_pagetable.c:404 iommufd_ioas_map+0x329/0x5f0 drivers/iommu/iommufd/ioas.c:222 iommufd_fops_ioctl+0x317/0x4b0 drivers/iommu/iommufd/main.c:337 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5770: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:521 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807 slab_free mm/slub.c:3786 [inline] __kmem_cache_free+0xaf/0x2d0 mm/slub.c:3799 iopt_abort_area drivers/iommu/iommufd/io_pagetable.c:292 [inline] iopt_unmap_iova_range+0x288/0x5f0 drivers/iommu/iommufd/io_pagetable.c:509 iopt_unmap_all+0x27/0x50 drivers/iommu/iommufd/io_pagetable.c:555 iommufd_ioas_unmap+0x3d0/0x490 drivers/iommu/iommufd/ioas.c:300 iommufd_fops_ioctl+0x317/0x4b0 drivers/iommu/iommufd/main.c:337 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888022286e00 which belongs to the cache kmalloc-cg-192 of size 192 The buggy address is located 32 bytes inside of freed 192-byte region [ffff888022286e00, ffff888022286ec0) The buggy address belongs to the physical page: page:ffffea000088a180 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22286 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000200 ffff88801244ddc0 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 5725, tgid 5724 (syz-executor669), ts 62798621274, free_ts 62769254078 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1731 prep_new_page mm/page_alloc.c:1738 [inline] get_page_from_freelist+0xf41/0x2c00 mm/page_alloc.c:3502 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4768 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x25f/0x390 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3192 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3291 __slab_alloc_node mm/slub.c:3344 [inline] slab_alloc_node mm/slub.c:3441 [inline] __kmem_cache_alloc_node+0x136/0x320 mm/slub.c:3490 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1057 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] iopt_alloc_area_pages+0x94/0x560 drivers/iommu/iommufd/io_pagetable.c:234 iopt_map_pages drivers/iommu/iommufd/io_pagetable.c:339 [inline] iopt_map_user_pages+0x205/0x4e0 drivers/iommu/iommufd/io_pagetable.c:404 iommufd_ioas_map+0x329/0x5f0 drivers/iommu/iommufd/ioas.c:222 iommufd_fops_ioctl+0x317/0x4b0 drivers/iommu/iommufd/main.c:337 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1302 [inline] free_unref_page_prepare+0x62e/0xcb0 mm/page_alloc.c:2564 free_unref_page_list+0xe3/0xa70 mm/page_alloc.c:2705 release_pages+0xcd8/0x1380 mm/swap.c:1042 tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:97 tlb_flush_mmu_free mm/mmu_gather.c:292 [inline] tlb_flush_mmu mm/mmu_gather.c:299 [inline] tlb_finish_mmu+0x14b/0x7e0 mm/mmu_gather.c:391 exit_mmap+0x2b2/0x930 mm/mmap.c:3123 __mmput+0x128/0x4c0 kernel/fork.c:1351 mmput+0x60/0x70 kernel/fork.c:1373 exit_mm kernel/exit.c:567 [inline] do_exit+0x9b0/0x29b0 kernel/exit.c:861 do_group_exit+0xd4/0x2a0 kernel/exit.c:1024 __do_sys_exit_group kernel/exit.c:1035 [inline] __se_sys_exit_group kernel/exit.c:1033 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1033 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff888022286d00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888022286d80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888022286e00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888022286e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888022286f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== --- This report is generated by a bot. 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