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AK7set+AwR/J9UVhmgkmV9QeFWskMRZYdkjiZFq8Cxv5vt6ZXRsSD5jwvnuIY5btoSPErVNvUsloFypusjrLzeda4T31tsiz4eT3 MIME-Version: 1.0 X-Received: by 2002:a92:b512:0:b0:30f:543d:e52c with SMTP id f18-20020a92b512000000b0030f543de52cmr1646847ile.2.1677879475508; Fri, 03 Mar 2023 13:37:55 -0800 (PST) Date: Fri, 03 Mar 2023 13:37:55 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000001d1fb505f605c295@google.com> Subject: [syzbot] [hardening?] [mm?] BUG: bad usercopy in con_font_op From: syzbot To: akpm@linux-foundation.org, keescook@chromium.org, linux-hardening@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 432D1A0017 X-Stat-Signature: g5winf8f8ozhoyomsbxdg6dehux146ij X-Rspam-User: X-HE-Tag: 1677879476-401203 X-HE-Meta: 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 LivgAxnz 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 pDnVRFx5 ink8EB0/2o1nn/delbf4F7HI7s1UwYBxb+eIBHZCamMLd/K6XfzzYsuDhN7uujqze5NnHKUL5UpayNfh7HaWNgFKMR+bMwbXOhjBRTx7AaW6jhVKp/Aw3MXGdMQW8Lclr+FFfGydjMseyEXiWnwsc/NYKRxrYw5guuuDQOWPlyz5kSwFxQo2bwl/OAebyZSzBrYe2kYxpiAu/JkbWYsA/3Er6XA7yXFIgu7RdHQAXOt3OcV4ffIzg74GYrwNA9IWgGhqkUesJqV3bus0t6D0HNUCY4KCSdbjxwVs0i+sxXdn5yyCXEiJ7AjxJf1Z/KzMm6K7lbdWW6qOCXcOWB01kZZ3V/SK5SDP+pyrf0iOoG77Yjh+kVNAqg7W57L+Xeqg X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hello, syzbot found the following issue on: HEAD commit: 2eb29d59ddf0 Merge tag 'drm-next-2023-03-03-1' of git://an.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=12e88ebcc80000 kernel config: https://syzkaller.appspot.com/x/.config?x=cab35c936731a347 dashboard link: https://syzkaller.appspot.com/bug?extid=3af17071816b61e807ed 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=10b71504c80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16f02d9cc80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ea23ee201337/disk-2eb29d59.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/40a9db02dede/vmlinux-2eb29d59.xz kernel image: https://storage.googleapis.com/syzbot-assets/8d4b574642d0/bzImage-2eb29d59.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3af17071816b61e807ed@syzkaller.appspotmail.com usercopy: Kernel memory exposure attempt detected from page alloc (offset 0, size 4194560)! ------------[ cut here ]------------ kernel BUG at mm/usercopy.c:102! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 5073 Comm: syz-executor309 Not tainted 6.2.0-syzkaller-13277-g2eb29d59ddf0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 RIP: 0010:usercopy_abort+0xb7/0xd0 mm/usercopy.c:102 Code: e8 fe e8 a1 ff 49 89 d9 4c 89 e1 48 89 ee 41 56 48 c7 c7 00 73 5b 8a 41 55 41 57 4c 8b 44 24 20 48 8b 54 24 18 e8 59 8b 85 ff <0f> 0b 48 c7 c3 00 71 5b 8a 49 89 df 49 89 d8 e9 71 ff ff ff 0f 1f RSP: 0018:ffffc90003bcf9e0 EFLAGS: 00010286 RAX: 000000000000005b RBX: ffffffff8a5b7100 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff816931fc RDI: 0000000000000005 RBP: ffffffff8a5b72c0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000000 R12: ffffffff8a5b7500 R13: 0000000000000000 R14: 0000000000400100 R15: ffffffff8a5b7100 FS: 0000555555b1b300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000000 CR3: 0000000075655000 CR4: 0000000000350ee0 Call Trace: check_heap_object mm/usercopy.c:200 [inline] __check_object_size mm/usercopy.c:251 [inline] __check_object_size+0x50a/0x6e0 mm/usercopy.c:213 check_object_size include/linux/thread_info.h:215 [inline] check_copy_size include/linux/thread_info.h:251 [inline] copy_to_user include/linux/uaccess.h:168 [inline] con_font_get drivers/tty/vt/vt.c:4580 [inline] con_font_op+0x397/0xf10 drivers/tty/vt/vt.c:4674 vt_k_ioctl drivers/tty/vt/vt_ioctl.c:474 [inline] vt_ioctl+0x620/0x2df0 drivers/tty/vt/vt_ioctl.c:752 tty_ioctl+0x773/0x16e0 drivers/tty/tty_io.c:2777 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: 0033:0x7f6672fd82d9 Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc66955e38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6672fd82d9 RDX: 0000000020000000 RSI: 0000000000004b72 RDI: 0000000000000003 RBP: 00007f6672f9c0c0 R08: 000000000000000d R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6672f9c150 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:usercopy_abort+0xb7/0xd0 mm/usercopy.c:102 Code: e8 fe e8 a1 ff 49 89 d9 4c 89 e1 48 89 ee 41 56 48 c7 c7 00 73 5b 8a 41 55 41 57 4c 8b 44 24 20 48 8b 54 24 18 e8 59 8b 85 ff <0f> 0b 48 c7 c3 00 71 5b 8a 49 89 df 49 89 d8 e9 71 ff ff ff 0f 1f RSP: 0018:ffffc90003bcf9e0 EFLAGS: 00010286 RAX: 000000000000005b RBX: ffffffff8a5b7100 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff816931fc RDI: 0000000000000005 RBP: ffffffff8a5b72c0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000000 R12: ffffffff8a5b7500 R13: 0000000000000000 R14: 0000000000400100 R15: ffffffff8a5b7100 FS: 0000555555b1b300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000000 CR3: 0000000075655000 CR4: 0000000000350ee0 --- 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@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches