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Message-ID: <0000000000009871740614647751@google.com> Date: Sun, 24 Mar 2024 02:13:16 -0700 From: syzbot <syzbot+cfc08744435c4cf94a40@...kaller.appspotmail.com> To: eadavis@...com, linux-kernel@...r.kernel.org, luto@...nel.org, peterz@...radead.org, syzkaller-bugs@...glegroups.com, tglx@...utronix.de, xrivendell7@...il.com Subject: Re: [syzbot] [kernel?] KMSAN: kernel-infoleak-after-free in copy_siginfo_to_user (2) syzbot has found a reproducer for the following issue on: HEAD commit: 70293240c5ce Merge tag 'timers-urgent-2024-03-23' of git:/.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=139071be180000 kernel config: https://syzkaller.appspot.com/x/.config?x=e6bd769cb793b98a dashboard link: https://syzkaller.appspot.com/bug?extid=cfc08744435c4cf94a40 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14694231180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15846fc1180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/0de52742d0b8/disk-70293240.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f304697881bf/vmlinux-70293240.xz kernel image: https://storage.googleapis.com/syzbot-assets/2b9d8a9376f0/bzImage-70293240.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+cfc08744435c4cf94a40@...kaller.appspotmail.com ===================================================== BUG: KMSAN: kernel-infoleak-after-free in instrument_copy_to_user include/linux/instrumented.h:114 [inline] BUG: KMSAN: kernel-infoleak-after-free in _copy_to_user+0xbc/0x110 lib/usercopy.c:40 instrument_copy_to_user include/linux/instrumented.h:114 [inline] _copy_to_user+0xbc/0x110 lib/usercopy.c:40 copy_to_user include/linux/uaccess.h:191 [inline] copy_siginfo_to_user+0x40/0x130 kernel/signal.c:3380 ptrace_request+0xfa7/0x36e0 kernel/ptrace.c:1046 arch_ptrace+0x43b/0x680 arch/x86/kernel/ptrace.c:848 __do_sys_ptrace kernel/ptrace.c:1285 [inline] __se_sys_ptrace+0x2d8/0x760 kernel/ptrace.c:1258 __x64_sys_ptrace+0xbd/0x110 kernel/ptrace.c:1258 do_syscall_64+0xd5/0x1f0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Uninit was stored to memory at: copy_siginfo include/linux/signal.h:18 [inline] ptrace_getsiginfo kernel/ptrace.c:685 [inline] ptrace_request+0xf33/0x36e0 kernel/ptrace.c:1044 arch_ptrace+0x43b/0x680 arch/x86/kernel/ptrace.c:848 __do_sys_ptrace kernel/ptrace.c:1285 [inline] __se_sys_ptrace+0x2d8/0x760 kernel/ptrace.c:1258 __x64_sys_ptrace+0xbd/0x110 kernel/ptrace.c:1258 do_syscall_64+0xd5/0x1f0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Uninit was stored to memory at: copy_siginfo include/linux/signal.h:18 [inline] collect_signal kernel/signal.c:587 [inline] __dequeue_signal+0x501/0xad0 kernel/signal.c:616 dequeue_signal+0x14b/0xb20 kernel/signal.c:639 get_signal+0xb46/0x2d00 kernel/signal.c:2790 arch_do_signal_or_restart+0x53/0xcb0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x5d/0x160 kernel/entry/common.c:218 do_syscall_64+0xe4/0x1f0 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Uninit was created at: slab_free_hook mm/slub.c:2073 [inline] slab_free mm/slub.c:4280 [inline] kmem_cache_free+0x257/0xa80 mm/slub.c:4344 __sigqueue_free kernel/signal.c:451 [inline] collect_signal kernel/signal.c:594 [inline] __dequeue_signal+0xa58/0xad0 kernel/signal.c:616 dequeue_signal+0x14b/0xb20 kernel/signal.c:639 get_signal+0xb46/0x2d00 kernel/signal.c:2790 arch_do_signal_or_restart+0x53/0xcb0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x5d/0x160 kernel/entry/common.c:218 do_syscall_64+0xe4/0x1f0 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Bytes 12-15 of 48 are uninitialized Memory access of size 48 starts at ffff8881240cfc60 Data copied to user address 0000000014dcf540 CPU: 1 PID: 5012 Comm: strace-static-x Not tainted 6.8.0-syzkaller-13213-g70293240c5ce #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 ===================================================== --- 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.
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