| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Sun, 13 Sep 2015 16:44:15 -0400 From: Sasha Levin <sasha.levin@...cle.com> To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, Andy Lutomirski <luto@...capital.net> CC: Andrey Ryabinin <a.ryabinin@...sung.com>, Andrey Konovalov <andreyknvl@...gle.com>, "x86@...nel.org" <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org> Subject: Out of bounds access in get_wchan Hi all, I've stumbled on the following while fuzzing with trinity inside a KVM tools guest running the latest -next: [635339.148553] BUG: KASan: out of bounds access in get_wchan+0x155/0x190 at addr ffff88032c0c7cc0 [635339.151199] Read of size 8 by task killall/31040 [635339.152690] page:ffffea000cb031c0 count:0 mapcount:0 mapping: (null) index:0x0 [635339.155124] flags: 0x1afffff80000000() [635339.155740] page dumped because: kasan: bad access detected [635339.156603] CPU: 9 PID: 31040 Comm: killall Not tainted 4.2.0-next-20150908-sasha-00043-g5af04dd #2534 [635339.158068] 0000000000010000 ffff8804590677c0 ffffffffaafc306a ffff880459067848 [635339.159293] ffff880459067838 ffffffffa97dacbe ffff8802f69d8d18 0000000000000001 [635339.160509] 0000000000000282 ffff8802f69d8000 0000000000000000 0000000000000007 [635339.161744] Call Trace: [635339.162235] dump_stack (lib/dump_stack.c:52) [635339.163061] kasan_report_error (mm/kasan/report.c:132 mm/kasan/report.c:193) [635339.163975] __asan_report_load8_noabort (mm/kasan/report.c:251) [635339.164965] ? get_wchan (arch/x86/kernel/process_64.c:513) [635339.165784] get_wchan (arch/x86/kernel/process_64.c:513) [635339.166615] do_task_stat (fs/proc/array.c:458) [635339.167646] ? children_seq_stop (fs/proc/array.c:377) [635339.168575] ? lockdep_init (kernel/locking/lockdep.c:3298) [635339.169423] ? lockdep_init (kernel/locking/lockdep.c:3298) [635339.170272] ? get_parent_ip (kernel/sched/core.c:2850) [635339.171106] ? lock_release (kernel/locking/lockdep.c:3641) [635339.171981] ? __lock_is_held (kernel/locking/lockdep.c:3491) [635339.172846] ? lock_is_held (kernel/locking/lockdep.c:3661) [635339.173722] ? get_pid_task (include/linux/rcupdate.h:914 kernel/pid.c:483) [635339.174578] proc_tgid_stat (fs/proc/array.c:553) [635339.175414] proc_single_show (./arch/x86/include/asm/atomic.h:118 include/linux/sched.h:2014 fs/proc/base.c:792) [635339.176297] seq_read (fs/seq_file.c:232) [635339.177229] ? seq_lseek (fs/seq_file.c:163) [635339.178085] ? vma_merge (mm/mmap.c:1112) [635339.178914] ? lockdep_init (kernel/locking/lockdep.c:3298) [635339.179757] ? get_parent_ip (kernel/sched/core.c:2850) [635339.180604] __vfs_read (fs/read_write.c:430) [635339.181394] ? lock_release (kernel/locking/lockdep.c:3641) [635339.182266] ? default_llseek (fs/read_write.c:430) [635339.183163] ? __fsnotify_inode_delete (fs/notify/fsnotify.c:192) [635339.184150] ? vm_mmap_pgoff (mm/util.c:330) [635339.185026] ? up_write (kernel/locking/rwsem.h:9 kernel/locking/rwsem.c:93) [635339.185845] ? security_file_permission (include/linux/fsnotify.h:60 security/security.c:737) [635339.186912] ? rw_verify_area (fs/read_write.c:406 (discriminator 4)) [635339.188753] vfs_read (fs/read_write.c:454) [635339.190331] ? __fget_light (fs/file.c:719) [635339.192068] SyS_read (fs/read_write.c:570 fs/read_write.c:562) [635339.193647] ? do_sendfile (fs/read_write.c:562) [635339.195420] ? lockdep_sys_exit_thunk (arch/x86/entry/thunk_64.S:44) [635339.196893] entry_SYSCALL_64_fastpath (arch/x86/entry/entry_64.S:186) [635339.197836] Memory state around the buggy address: [635339.198565] ffff88032c0c7b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [635339.199626] ffff88032c0c7c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [635339.200704] >ffff88032c0c7c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [635339.201770] ^ [635339.202594] ffff88032c0c7d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [635339.203665] ffff88032c0c7d80: 00 00 00 00 f1 f1 f1 f1 00 f4 f4 f4 f2 f2 f2 f2 Thanks, Sasha -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists