syzbot


KMSAN: uninit-value in gsmld_receive_buf

Status: upstream: reported on 2024/04/28 21:20
Subsystems: serial
[Documentation on labels]
Reported-by: syzbot+2f64914d6a3a8ce91bdd@syzkaller.appspotmail.com
First crash: 164d, last: 12d
Discussions (4)
Title Replies (including bot) Last reply
[syzbot] Monthly serial report (Sep 2024) 0 (1) 2024/09/14 10:58
[syzbot] Monthly serial report (Aug 2024) 0 (1) 2024/08/13 12:34
[syzbot] Monthly serial report (May 2024) 0 (1) 2024/05/06 13:18
[syzbot] [serial?] KMSAN: uninit-value in gsmld_receive_buf 0 (1) 2024/04/28 21:20
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: unable to handle kernel NULL pointer dereference in gsmld_receive_buf serial C error 324 763d 790d 22/28 fixed on 2023/02/24 13:50

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in gsmld_receive_buf+0x5dc/0x640 drivers/tty/n_gsm.c:3609
 gsmld_receive_buf+0x5dc/0x640 drivers/tty/n_gsm.c:3609
 tty_ldisc_receive_buf+0x202/0x290 drivers/tty/tty_buffer.c:391
 tty_port_default_receive_buf+0xdf/0x190 drivers/tty/tty_port.c:37
 receive_buf drivers/tty/tty_buffer.c:445 [inline]
 flush_to_ldisc+0x473/0xdb0 drivers/tty/tty_buffer.c:495
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3310
 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3391
 kthread+0x3e2/0x540 kernel/kthread.c:389
 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4092 [inline]
 slab_alloc_node mm/slub.c:4135 [inline]
 __do_kmalloc_node mm/slub.c:4264 [inline]
 __kmalloc_noprof+0x661/0xf30 mm/slub.c:4277
 kmalloc_noprof include/linux/slab.h:882 [inline]
 tty_buffer_alloc drivers/tty/tty_buffer.c:180 [inline]
 __tty_buffer_request_room+0x36e/0x6d0 drivers/tty/tty_buffer.c:273
 __tty_insert_flip_string_flags+0x140/0x570 drivers/tty/tty_buffer.c:309
 tty_insert_flip_char include/linux/tty_flip.h:77 [inline]
 uart_insert_char+0x39e/0xa10 drivers/tty/serial/serial_core.c:3568
 serial8250_read_char+0x1a7/0x5d0 drivers/tty/serial/8250/8250_port.c:1743
 serial8250_rx_chars drivers/tty/serial/8250/8250_port.c:1760 [inline]
 serial8250_handle_irq+0x970/0x1130 drivers/tty/serial/8250/8250_port.c:1924
 serial8250_default_handle_irq+0x120/0x2b0 drivers/tty/serial/8250/8250_port.c:1949
 serial8250_interrupt+0xc5/0x360 drivers/tty/serial/8250/8250_core.c:86
 __handle_irq_event_percpu+0x118/0xca0 kernel/irq/handle.c:158
 handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
 handle_irq_event+0xef/0x2c0 kernel/irq/handle.c:210
 handle_edge_irq+0x340/0xfb0 kernel/irq/chip.c:831
 generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
 handle_irq arch/x86/kernel/irq.c:247 [inline]
 call_irq_handler arch/x86/kernel/irq.c:259 [inline]
 __common_interrupt+0x97/0x1f0 arch/x86/kernel/irq.c:285
 common_interrupt+0x92/0xb0 arch/x86/kernel/irq.c:278
 asm_common_interrupt+0x2b/0x40 arch/x86/include/asm/idtentry.h:693

CPU: 1 UID: 0 PID: 3701 Comm: kworker/u8:19 Tainted: G        W          6.11.0-syzkaller-08833-gde5cb0dcb74c #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: events_unbound flush_to_ldisc
=====================================================

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/09/23 17:52 upstream de5cb0dcb74c 89298aad .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in gsmld_receive_buf
2024/07/29 08:55 upstream dc1c8034e31b 46eb10b7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in gsmld_receive_buf
2024/04/24 21:18 upstream e88c4cfcb7b8 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in gsmld_receive_buf
2024/08/30 21:17 upstream 20371ba12063 f885a8ff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in gsmld_receive_buf
2024/08/12 15:42 upstream 7c626ce4bae1 6f4edef4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in gsmld_receive_buf
2024/08/12 15:42 upstream 7c626ce4bae1 6f4edef4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in gsmld_receive_buf
* Struck through repros no longer work on HEAD.