Created attachment 260249 [details]
Proof-of-Concept file

Integer overflow on ./include/linux/time.h  - attached you can find the PoC file.

Ubsan log:
================================================================================
UBSAN: Undefined behaviour in ./include/linux/time.h:244:27
signed integer overflow:
35184372088832 * 1000000000 cannot be represented in type 'long int'
CPU: 1 PID: 1986 Comm: syz-executor Not tainted 4.8.17 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu2 04/01/2014
 0000000000000000 000000000e42994e ffff8800580dfa68 ffffffff8214c158
 0000000041b58ab3 ffffffff83a85d08 ffffffff8214c080 ffff8800580dfa90
 ffff8800580dfa30 000000000e42994e ffffffff842513e0 ffff8800580dfb68
Call Trace:
 [<ffffffff8214c158>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff8214c158>] dump_stack+0xd8/0x140 lib/dump_stack.c:51
 [<ffffffff82235877>] ubsan_epilogue+0x12/0x86 lib/ubsan.c:164
 [<ffffffff822373a6>] handle_overflow+0x234/0x28e lib/ubsan.c:195
 [<ffffffff8223748c>] __ubsan_handle_mul_overflow+0x2a/0x3e lib/ubsan.c:219
 [<ffffffff81520b5e>] timeval_to_ns include/linux/time.h:244 [inline]
 [<ffffffff81520b5e>] set_cpu_itimer+0x82e/0xa50 kernel/time/itimer.c:155
 [<ffffffff8152148a>] do_setitimer+0x13a/0x8e0 kernel/time/itimer.c:233
 [<ffffffff81521e7b>] SYSC_setitimer kernel/time/itimer.c:294 [inline]
 [<ffffffff81521e7b>] SyS_setitimer+0xfb/0x260 kernel/time/itimer.c:278
 [<ffffffff83362cb6>] entry_SYSCALL_64_fastpath+0x1e/0xa8