1 int main(int argc, char **argv) {
2     int buf[10];
3     buf[10+argc] = 1; // buffer overflow (argc == 1)
4     return 0;
5 }

 1 0000000000400c22 <main>:
 2   ......:
 3   400c84: 0f 9d c1             setge  %cl
 4   400c87: 44 21 c1             and    %r8d,%ecx
 5   400c8a: 84 c9                test   %cl,%cl
 6   400c8c: 74 08                je     400c96 <main+0xd4>
 7   400c8e: 48 89 d7             mov    %rdx,%rdi
 8   400c91: e8 7a fb ff ff       callq  400810 <__asan_report_store4@plt>
 9   400c96: 48 63 d7             movslq %edi,%rdx
10   400c99: c7 44 96 a0 01 00 00 movl   $0x1,-0x60(%rsi,%rdx,4)
11   400ca0: 00 
12   400ca1: ba 00 00 00 00       mov    $0x0,%edx
13   400ca6: 49 39 dc             cmp    %rbx,%r12
14   400ca9: 74 2b                je     400cd6 <main+0x114>
15   ......:

 1 $ ./a.out
 2 =================================================================
 3 ==2622==ERROR: AddressSanitizer: stack-buffer-overflow on address \
 4     0x7f7fff346b4c at pc 0x000000400c96 bp 0x7f7fff346ae0 \
 5     sp 0x7f7fff346ad8
 6 WRITE of size 4 at 0x7f7fff346b4c thread T0
 7     #0 0x400c95 in main (/tmp/./a.out+0x400c95)
 8     #1 0x400af2 in ___start (/tmp/./a.out+0x400af2)
 9 
10 Address 0x7f7fff346b4c is located in stack of thread T0 at \
11     offset 76 in frame
12     #0 0x400bd1 in main (/tmp/./a.out+0x400bd1)
13 
14   This frame has 1 object(s):
15     [32, 72) 'buf' <== Memory access at offset 76 overflows this \
16     variable
17 ....

 1 Fix buffer overflow, detected by kASan.
 2 
 3     ifconfig gif0 create
 4     ifconfig gif0 up
 5 
 6 [   50.682919] kASan: Unauthorized Access In 0xffffffff80f22655: \
 7 Addr 0xffffffff81b997a0 [8 bytes, read]
 8 [   50.682919] #0 0xffffffff8021ce6a in kasan_memcpy <netbsd>
 9 [   50.692999] #1 0xffffffff80f22655 in m_copyback_internal <netbsd>
10 [   50.692999] #2 0xffffffff80f22e81 in m_copyback <netbsd>
11 [   50.692999] #3 0xffffffff8103109a in rt_msg1 <netbsd>
12 [   50.692999] #4 0xffffffff8159109a in compat_70_rt_newaddrmsg1 <n
13 [   50.692999] #5 0xffffffff81031b0f in rt_newaddrmsg <netbsd>
14 [   50.692999] #6 0xffffffff8102c35e in rt_ifa_addlocal <netbsd>
15 [   50.692999] #7 0xffffffff80a5287c in in6_update_ifa1 <netbsd>
16 [   50.692999] #8 0xffffffff80a54149 in in6_update_ifa <netbsd>
17 [   50.692999] #9 0xffffffff80a59176 in in6_ifattach <netbsd>
18 [   50.692999] #10 0xffffffff80a56dd4 in in6_if_up <netbsd>
19 [   50.692999] #11 0xffffffff80fc5cb8 in if_up_locked <netbsd>
20 [   50.703622] #12 0xffffffff80fcc4c1 in ifioctl_common <netbsd>
21 [   50.703622] #13 0xffffffff80fde694 in gif_ioctl <netbsd>
22 [   50.703622] #14 0xffffffff80fcdb1f in doifioctl <netbsd>

 1 Fix buffer overflow, detected by kASan.
 2 
 3 [    1.044878] kASan: Unauthorized Access In 0xffffffff804ec7e2: \
 4 Addr 0xffffffff818a51e4 [2 bytes, read]
 5 [    1.044878] #0 0xffffffff804ec7e2 in mskc_probe <netbsd>
 6 [    1.044878] #1 0xffffffff80e92a77 in mapply <netbsd>
 7 [    1.044878] #2 0xffffffff80e92e5f in config_search_loc <netbsd>
 8 [    1.044878] #3 0xffffffff80e93fb5 in config_found_sm_loc <netbsd>
 9 [    1.044878] #4 0xffffffff802ca9ea in pci_probe_device <netbsd>
10 [    1.044878] #5 0xffffffff802cad97 in pci_enumerate_bus <netbsd>
11 [    1.044878] #6 0xffffffff802caf00 in pcirescan <netbsd>
12 [    1.044878] #7 0xffffffff802cb1ee in pciattach <netbsd>
13 [    1.044878] #8 0xffffffff80e93e5b in config_attach_loc <netbsd>
14 [    1.044878] #9 0xffffffff80e93fce in config_found_sm_loc <netbsd>
15 [    1.044878] #10 0xffffffff80271212 in mp_pci_scan <netbsd>
16 [    1.044878] #11 0xffffffff8022d9ee in mainbus_attach <netbsd>
17 [    1.044878] #12 0xffffffff80e93e5b in config_attach_loc <netbsd>
18 [    1.044878] #13 0xffffffff8021e38b in cpu_configure <netbsd>
19 [    1.044878] #14 0xffffffff814a7068 in main <netbsd>