Messages in this thread | | | Date | Mon, 26 Sep 2022 09:43:42 -0700 | Subject | [syzbot] Unable to handle kernel write to read-only memory at virtual address ADDR | From | syzbot <> |
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Hello,
syzbot found the following issue on:
HEAD commit: c194837ebb57 Merge branch 'for-next/core', remote-tracking.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=144f9ca8880000 kernel config: https://syzkaller.appspot.com/x/.config?x=15a770deac0c935a dashboard link: https://syzkaller.appspot.com/bug?extid=9831d4affe35bb65b891 compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14d8f5c4880000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=164dc2a8880000
Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/8d8ae425e7fa/disk-c194837e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c540d501ebe7/vmlinux-c194837e.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9831d4affe35bb65b891@syzkaller.appspotmail.com
Unable to handle kernel write to read-only memory at virtual address ffff80000cb9e7b5 Mem abort info: ESR = 0x000000009600004e EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x0e: level 2 permission fault Data abort info: ISV = 0, ISS = 0x0000004e CM = 0, WnR = 1 swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000001c566a000 [ffff80000cb9e7b5] pgd=100000023ffff003, p4d=100000023ffff003, pud=100000023fffe003, pmd=00600001c5000781 Internal error: Oops: 000000009600004e [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 2561 Comm: udevd Not tainted 6.0.0-rc6-syzkaller-17742-gc194837ebb57 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __memset+0x50/0x188 lr : slab_post_alloc_hook mm/slab.h:729 [inline] lr : slab_alloc_node mm/slub.c:3243 [inline] lr : __kmalloc_node_track_caller+0x2bc/0x3bc mm/slub.c:4955 sp : ffff800016a33920 x29: ffff800016a33930 x28: ffff0000c9534f80 x27: 0000000000000000 x26: 000000000fffffff x25: ffff80000cb9e7b5 x24: 0000000000000000 x23: ffff0000c0001400 x22: ffff8000096b34f4 x21: 0000000000000200 x20: 0000000000082cc0 x19: 00000000ffffffff x18: 0000000000000000 x17: 0000000000000000 x16: ffff80000db49158 x15: ffff0000c9534f80 x14: 0000000000000010 x13: 0000000000000000 x12: ffff0000c9534f80 x11: 0000000000000001 x10: ffff80000d309000 x9 : 0000000000080800 x8 : ffff80000cb9e7b5 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 000000000000000b x3 : 000000000002b678 x2 : 0000000000000200 x1 : 0000000000000000 x0 : ffff80000cb9e7b5 Call trace: __memset+0x50/0x188 kmalloc_reserve net/core/skbuff.c:362 [inline] __alloc_skb+0x198/0x378 net/core/skbuff.c:434 alloc_skb include/linux/skbuff.h:1257 [inline] alloc_uevent_skb+0x5c/0xd8 lib/kobject_uevent.c:290 uevent_net_broadcast_untagged+0xa0/0x1cc lib/kobject_uevent.c:326 kobject_uevent_net_broadcast+0x14c/0x1f8 lib/kobject_uevent.c:409 kobject_uevent_env+0x428/0x5ec lib/kobject_uevent.c:593 kobject_synth_uevent+0x354/0x6a4 lib/kobject_uevent.c:208 uevent_store+0x34/0x80 drivers/base/core.c:2509 dev_attr_store+0x4c/0x70 drivers/base/core.c:2211 sysfs_kf_write+0xf4/0x11c fs/sysfs/file.c:136 kernfs_fop_write_iter+0x1e4/0x294 fs/kernfs/file.c:354 call_write_iter include/linux/fs.h:2187 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x2dc/0x46c fs/read_write.c:578 ksys_write+0xb4/0x160 fs/read_write.c:631 __do_sys_write fs/read_write.c:643 [inline] __se_sys_write fs/read_write.c:640 [inline] __arm64_sys_write+0x24/0x34 fs/read_write.c:640 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 Code: d65f03c0 cb0803e4 f2400c84 54000080 (a9001d07) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: d65f03c0 ret 4: cb0803e4 neg x4, x8 8: f2400c84 ands x4, x4, #0xf c: 54000080 b.eq 0x1c // b.none * 10: a9001d07 stp x7, x7, [x8] <-- trapping instruction
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