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KMSAN: uninit-value in ppp_sync_receive #17

Closed yshigeru closed 1 year ago

yshigeru commented 1 year ago 
=====================================================
BUG: KMSAN: uninit-value in ppp_sync_input drivers/net/ppp/ppp_synctty.c:690 [inline]
BUG: KMSAN: uninit-value in ppp_sync_receive+0xdc9/0xe70 drivers/net/ppp/ppp_synctty.c:334
 ppp_sync_input drivers/net/ppp/ppp_synctty.c:690 [inline]
 ppp_sync_receive+0xdc9/0xe70 drivers/net/ppp/ppp_synctty.c:334
 tiocsti+0x328/0x450 drivers/tty/tty_io.c:2295
 tty_ioctl+0x808/0x1920 drivers/tty/tty_io.c:2694
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0x211/0x400 fs/ioctl.c:857
 __x64_sys_ioctl+0x97/0xe0 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Uninit was created at:
 __alloc_pages+0x75d/0xe80 mm/page_alloc.c:4591
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 __page_frag_cache_refill+0x9a/0x2c0 mm/page_alloc.c:4691
 page_frag_alloc_align+0x91/0x5d0 mm/page_alloc.c:4722
 page_frag_alloc include/linux/gfp.h:322 [inline]
 __netdev_alloc_skb+0x215/0x6d0 net/core/skbuff.c:728
 netdev_alloc_skb include/linux/skbuff.h:3225 [inline]
 dev_alloc_skb include/linux/skbuff.h:3238 [inline]
 ppp_sync_input drivers/net/ppp/ppp_synctty.c:669 [inline]
 ppp_sync_receive+0x237/0xe70 drivers/net/ppp/ppp_synctty.c:334
 tiocsti+0x328/0x450 drivers/tty/tty_io.c:2295
 tty_ioctl+0x808/0x1920 drivers/tty/tty_io.c:2694
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0x211/0x400 fs/ioctl.c:857
 __x64_sys_ioctl+0x97/0xe0 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

CPU: 0 PID: 12950 Comm: syz-executor.1 Not tainted 6.6.0-14500-g1c41041124bd #10
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-1.fc38 04/01/2014
=====================================================
yshigeru commented 1 year ago

repro.c.gz

yshigeru commented 1 year ago

Sent a patch: https://lore.kernel.org/all/20231108154420.1474853-1-syoshida@redhat.com/

yshigeru commented 1 year ago

Merged on the net tree: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=719639853d88