Hello, syzbot found the following issue on: HEAD commit: fec50db7033e Linux 6.9-rc3 git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=16509ba1180000 kernel config: https://syzkaller.appspot.com/x/.config?x=13e7da432565d94c dashboard link: https://syzkaller.appspot.com/bug?extid=79102ed905e5b2dc0fc3 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=10a4af9d180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12980f9d180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/901017b36ccc/disk-fec50db7.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/16bfcf5618d3/vmlinux-fec50db7.xz kernel image: https://storage.googleapis.com/syzbot-assets/dc9c5a1e7d02/bzImage-fec50db7.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+79102ed905e5b2dc0fc3@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline] BUG: KMSAN: kernel-infoleak in __copy_to_user_inatomic include/linux/uaccess.h:125 [inline] BUG: KMSAN: kernel-infoleak in copy_to_user_nofault+0x129/0x1f0 mm/maccess.c:149 instrument_copy_to_user include/linux/instrumented.h:114 [inline] __copy_to_user_inatomic include/linux/uaccess.h:125 [inline] copy_to_user_nofault+0x129/0x1f0 mm/maccess.c:149 ____bpf_probe_write_user kernel/trace/bpf_trace.c:349 [inline] bpf_probe_write_user+0x104/0x180 kernel/trace/bpf_trace.c:327 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997 __bpf_prog_run64+0xb5/0xe0 kernel/bpf/core.c:2236 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] bpf_trace_run2+0x116/0x300 kernel/trace/bpf_trace.c:2420 __bpf_trace_kfree+0x29/0x40 include/trace/events/kmem.h:94 trace_kfree include/trace/events/kmem.h:94 [inline] kfree+0x6a5/0xa30 mm/slub.c:4377 vfs_writev+0x12bf/0x1450 fs/read_write.c:978 do_writev+0x251/0x5c0 fs/read_write.c:1018 __do_sys_writev fs/read_write.c:1091 [inline] __se_sys_writev fs/read_write.c:1088 [inline] __x64_sys_writev+0x98/0xe0 fs/read_write.c:1088 do_syscall_64+0xd5/0x1f0 entry_SYSCALL_64_after_hwframe+0x72/0x7a Local variable stack created at: __bpf_prog_run64+0x45/0xe0 kernel/bpf/core.c:2236 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] bpf_trace_run2+0x116/0x300 kernel/trace/bpf_trace.c:2420 Bytes 0-7 of 8 are uninitialized Memory access of size 8 starts at ffff888121ec7ae8 Data copied to user address 00000000ffffffff CPU: 1 PID: 4779 Comm: dhcpcd Not tainted 6.9.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
