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AHgh+RoXK9iiaZRwDkBrj12ALq7QHaCJiDsYDSni1565XDTGISI3NevYoxgcXJYFYBD6YoKGgxhh5IfwDQizGLk=@vger.kernel.org X-Gm-Message-State: AFuF++kEwswF3w4wgp6xkplAmfWX9HihoYN+F2f8dumzyvoVOhIasM+n rBScz0+jLU6SHnIZorZWOlNGphOMux7VQ3rkBwoKCEB/Cmn6zAeyEOvjTg7MVH5FZzz0Rk+7f91 ZVWy6IvgEi8z2tP/fuB/442QU3HJytgltm71apQe362YAuec0ynzsx6K2bZA= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:144f:b0:492:c9a4:2104 with SMTP id 5614622812f47-4b59e8d21afmr386604b6e.10.1788070047659; Sat, 29 Aug 2026 23:07:27 -0700 (PDT) Date: Sat, 29 Aug 2026 23:07:27 -0700 In-Reply-To: <6a8bd82a.dbb3a75c.13dd47.0060.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a93c89f.08e933ee.dbf97.00fd.GAE@google.com> Subject: Re: [syzbot] [kernel?] KASAN: global-out-of-bounds Read in uevent_store From: syzbot To: dakr@kernel.org, driver-core@lists.linux.dev, gregkh@linuxfoundation.org, jeffinphilip14@gmail.com, linux-kernel@vger.kernel.org, rafael@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: f1b8fa82cab7 Merge branch 'for-next/core' into for-kernelci 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=12e82379580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d1128bc53f2ef7f3 dashboard link: https://syzkaller.appspot.com/bug?extid=d164947c037324221043 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12597d79580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16e82379580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/932d85a2bda2/disk-f1b8fa82.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5b6b8fb76e8d/vmlinux-f1b8fa82.xz kernel image: https://storage.googleapis.com/syzbot-assets/c246b61ee396/Image-f1b8fa82.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d164947c037324221043@syzkaller.appspotmail.com ================================================================== BUG: KASAN: global-out-of-bounds in kobject_action_type lib/kobject_uevent.c:86 [inline] BUG: KASAN: global-out-of-bounds in kobject_synth_uevent+0x1e0/0x730 lib/kobject_uevent.c:200 Read of size 1 at addr ffff800087b429cb by task syz.0.17/4919 CPU: 1 UID: 0 PID: 4919 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xb0/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0x8c/0xc4 mm/kasan/report.c:595 __asan_report_load1_noabort+0x20/0x2c mm/kasan/report_generic.c:378 kobject_action_type lib/kobject_uevent.c:86 [inline] kobject_synth_uevent+0x1e0/0x730 lib/kobject_uevent.c:200 uevent_store+0x54/0x84 drivers/base/core.c:2851 drv_attr_store+0x80/0xa4 drivers/base/bus.c:125 sysfs_kf_write+0xe0/0x108 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x260/0x3b8 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x51c/0xa0c fs/read_write.c:687 ksys_write+0x12c/0x228 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x84/0x98 fs/read_write.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 The buggy address belongs to the variable: .str.34+0x6b/0x80 The buggy address belongs to a vmalloc virtual mapping The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x21a142 flags: 0x5ffc00000002000(reserved|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000002000 fffffdffc7685088 fffffdffc7685088 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff800087b42880: 07 f9 f9 f9 05 f9 f9 f9 07 f9 f9 f9 00 f9 f9 f9 ffff800087b42900: 05 f9 f9 f9 07 f9 f9 f9 00 02 f9 f9 00 00 00 00 >ffff800087b42980: 00 00 00 00 00 03 f9 f9 f9 f9 f9 f9 00 00 00 00 ^ ffff800087b42a00: 00 00 01 f9 f9 f9 f9 f9 00 00 00 04 f9 f9 f9 f9 ffff800087b42a80: 00 00 02 f9 f9 f9 f9 f9 06 f9 f9 f9 00 00 00 00 ================================================================== --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.