KASAN: vmalloc-out-of-bounds Read in bpf_trace

KASAN: vmalloc-out-of-bounds Read in bpf_trace_run7
Status: upstream: reported C repro on 2021/01/05 15:25
Reported-by: syzbot+fad5d91c7158ce568634@syzkaller.appspotmail.com
First crash: 26d, last: 3d11h

Cause bisection: introduced by (bisect log) :
commit 8b401f9ed2441ad9e219953927a842d24ed051fc
Author: Yonghong Song <yhs@fb.com>
Date: Thu May 23 21:47:45 2019 +0000

bpf: implement bpf_send_signal() helper

Crash: BUG: unable to handle kernel paging request in bpf_trace_run7 (log)
Repro: C syz .config

Sample crash report:

==================================================================
BUG: KASAN: vmalloc-out-of-bounds in __bpf_trace_run kernel/trace/bpf_trace.c:2088 [inline]
BUG: KASAN: vmalloc-out-of-bounds in bpf_trace_run7+0x411/0x420 kernel/trace/bpf_trace.c:2130
Read of size 8 at addr ffffc90000e5c030 by task syz-executor460/8508

CPU: 1 PID: 8508 Comm: syz-executor460 Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5/0x2f8 mm/kasan/report.c:230
 __kasan_report mm/kasan/report.c:396 [inline]
 kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413
 __bpf_trace_run kernel/trace/bpf_trace.c:2088 [inline]
 bpf_trace_run7+0x411/0x420 kernel/trace/bpf_trace.c:2130
 __bpf_trace_percpu_alloc_percpu+0x1dc/0x220 include/trace/events/percpu.h:10
 __traceiter_percpu_alloc_percpu+0x97/0xf0 include/trace/events/percpu.h:10
 trace_percpu_alloc_percpu include/trace/events/percpu.h:10 [inline]
 pcpu_alloc+0xba6/0x16f0 mm/percpu.c:1844
 bpf_prog_alloc+0x78/0x250 kernel/bpf/core.c:117
 bpf_prog_load+0x656/0x1f40 kernel/bpf/syscall.c:2152
 __do_sys_bpf+0x1251/0x4f00 kernel/bpf/syscall.c:4380
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x441659
Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 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 0f 83 8b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffebad746f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441659
RDX: 0000000000000078 RSI: 0000000020000200 RDI: 0000000000000005
RBP: 000000000001191b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402470
R13: 0000000000402500 R14: 0000000000000000 R15: 0000000000000000


Memory state around the buggy address:
 ffffc90000e5bf00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc90000e5bf80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
>ffffc90000e5c000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
                                     ^
 ffffc90000e5c080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
 ffffc90000e5c100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8
==================================================================

Crashes (4):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Maintainers
ci-upstream-bpf-next-kasan-gce	2021/01/20 23:08	bpf-next	7d68e382	d4f4eca5	.config	log	report	syz	C		andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, hawk@kernel.org, john.fastabend@gmail.com, kafai@fb.com, kpsingh@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, netdev@vger.kernel.org, rostedt@goodmis.org, songliubraving@fb.com, yhs@fb.com
ci-upstream-bpf-next-kasan-gce	2021/01/21 20:11	bpf-next	b452ee00	d4f4eca5	.config	log	report			info	andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, hawk@kernel.org, john.fastabend@gmail.com, kafai@fb.com, kpsingh@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, netdev@vger.kernel.org, rostedt@goodmis.org, songliubraving@fb.com, yhs@fb.com
ci-upstream-bpf-next-kasan-gce	2021/01/13 11:33	bpf-next	7c7a80ea	a945f0a3	.config	log	report			info	andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, hawk@kernel.org, john.fastabend@gmail.com, kafai@fb.com, kpsingh@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, netdev@vger.kernel.org, rostedt@goodmis.org, songliubraving@fb.com, yhs@fb.com
ci-upstream-bpf-next-kasan-gce	2020/12/29 12:45	bpf-next	00a279e4	8259d56c	.config	log	report			info	andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, hawk@kernel.org, john.fastabend@gmail.com, kafai@fb.com, kpsingh@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, netdev@vger.kernel.org, rostedt@goodmis.org, songliubraving@fb.com, yhs@fb.com