pkg/report: suppress reports with detected stack smashing

Logs containing "*** stack smashing detected ***: terminated" are not of
particular interest, as this indicates syz-executor corruption.

Suppress bug reports in this case.

2 files changed, 86 insertions, 0 deletions

diff --git a/pkg/report/linux.go b/pkg/report/linux.go
index 9992d3a71..895760b8c 100644
--- a/pkg/report/linux.go
+++ b/pkg/report/linux.go
@@ -127,6 +127,7 @@ func ctorLinux(cfg *config) (reporterImpl, []string, error) {
 		"lowmemorykiller: Killing 'syz-fuzzer'",
 		"lowmemorykiller: Killing 'sshd'",
 		"INIT: PANIC: segmentation violation!",
+		"\\*\\*\\* stack smashing detected \\*\\*\\*: terminated",
 	}
 	return ctx, suppressions, nil
 }
diff --git a/pkg/report/testdata/linux/report/621 b/pkg/report/testdata/linux/report/621
new file mode 100644
index 000000000..720b48dc4
--- /dev/null
+++ b/pkg/report/testdata/linux/report/621
@@ -0,0 +1,85 @@
+TITLE: WARNING in ovl_create_real
+SUPPRESSED: Y
+
+[  147.467058][T10579] syz-executor846[10579]: segfault at 4cb420 ip 00000000004cb420 sp 00007f27fd37a250 error 15 in syz-executor846382544[4c9000+3000]
+*** stack smashing detected ***: terminated
+[  147.481562][T10579] Code: 00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <01> 00 00 00 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+[  147.508816][T10582] syz-executor846[10582]: segfault at 4cb420 ip 00000000004cb420 sp 00007f27fd37a250 error 15
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+[  147.519923][T10582] Code: 00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <01> 00 00 00 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+[  147.545788][T10587] syz-executor846[10587]: segfault at 4cb420 ip 00000000004cb420 sp 00007f27fd37a250 error 15
+[  147.556884][T10587] Code: 00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <01> 00 00 00 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+[  147.582679][T10590] syz-executor846[10590]: segfault at 4cb420 ip 00000000004cb420 sp 00007f27fd37a250 error 15
+[  147.593965][T10590] Code: 00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <01> 00 00 00 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+[  147.635667][T10598] syz-executor846[10598]: segfault at 4cb420 ip 00000000004cb420 sp 00007f27fd37a250 error 15
+[  147.647150][T10598] Code: 00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <01> 00 00 00 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+*** stack smashing detected ***: terminated
+
+WARNING: CPU: 1 PID: 6576 at fs/overlayfs/dir.c:212 ovl_create_real+0x272/0x520 fs/overlayfs/dir.c:212
+Modules linked in:
+CPU: 1 PID: 6576 Comm: syz-executor088 Not tainted 5.14.0-rc3-next-20210729-syzkaller #0
+Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+RIP: 0010:ovl_create_real+0x272/0x520 fs/overlayfs/dir.c:212
+Code: 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 80 02 00 00 49 83 7c 24 68 00 0f 85 7a fe ff ff e8 de b6 c3 fe <0f> 0b 4c 89 e5 49 c7 c4 fb ff ff ff e9 57 fe ff ff 66 81 eb 00 10
+RSP: 0018:ffffc90002bef958 EFLAGS: 00010293
+RAX: 0000000000000000 RBX: 0000000000004000 RCX: 0000000000000000
+RDX: ffff88807b10b900 RSI: ffffffff82b20102 RDI: ffff88806f971208
+RBP: ffff88806f9711a0 R08: 0000000000000000 R09: 0000000000000000
+R10: ffffffff82b2018b R11: 0000000000000000 R12: ffff88806f9711a0
+R13: 0000000000004000 R14: ffff8880715c8a20 R15: ffff8880715c8b00
+FS:  00007fe7eef6d700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
+CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
+CR2: 00007f49bbacf000 CR3: 000000001eea6000 CR4: 00000000001506f0
+DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
+DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
+Call Trace:
+ ovl_workdir_create+0x3a9/0x5b0 fs/overlayfs/super.c:790
+ ovl_make_workdir fs/overlayfs/super.c:1364 [inline]
+ ovl_get_workdir fs/overlayfs/super.c:1511 [inline]
+ ovl_fill_super+0x199a/0x5fb0 fs/overlayfs/super.c:2067
+ mount_nodev+0x60/0x110 fs/super.c:1414
+ legacy_get_tree+0x105/0x220 fs/fs_context.c:610
+ vfs_get_tree+0x89/0x2f0 fs/super.c:1498
+ do_new_mount fs/namespace.c:2978 [inline]
+ path_mount+0x132a/0x1fa0 fs/namespace.c:3308
+ do_mount fs/namespace.c:3321 [inline]
+ __do_sys_mount fs/namespace.c:3529 [inline]
+ __se_sys_mount fs/namespace.c:3506 [inline]
+ __x64_sys_mount+0x27f/0x300 fs/namespace.c:3506
+ do_syscall_x64 arch/x86/entry/common.c:50 [inline]
+ do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
+ entry_SYSCALL_64_after_hwframe+0x44/0xae
+RIP: 0033:0x4458d9
+Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
+RSP: 002b:00007fe7eef6d2f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
+RAX: ffffffffffffffda RBX: 00000000004ca400 RCX: 00000000004458d9
+RDX: 00000000200000c0 RSI: 0000000020000000 RDI: 000000000040000d
+RBP: 000000000049a074 R08: 0000000020000100 R09: 0000000000000000
+R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e
+R13: 0079616c7265766f R14: 003270756f726763 R15: 00000000004ca408