Why can't I print?

[shisuhao]

Hello, everyone. Recently, I researched Hwasan, but I found out why Hwasan cannot print the same code after adding a print function.
demo like this：
[root@kwephicprd11837 test]# clang aa.c -o main -g -O0 -fsanitize=address -fsanitize-recover=address,all
aa.c:25:13: warning: implicitly declaring library function 'strstr' with type 'char *(const char *, const char *)' [-Wimplicit-function-declaration]
if (strstr(line_buff, "VmRSS:") != NULL)
^
aa.c:25:13: note: include the header <string.h> or explicitly provide a declaration for 'strstr'
aa.c:50:16: warning: implicit declaration of function 'getpid' is invalid in C99 [-Wimplicit-function-declaration]
int ppid = getpid();
^
aa.c:46:13: warning: array index 12 is past the end of the array (which contains 12 elements) [-Warray-bounds]
int b = a[12];
^ ~~
aa.c:45:5: note: array 'a' declared here
int a[12] = {0};
^
aa.c:49:14: warning: array index -1 is before the beginning of the array [-Warray-bounds]
int cc = abc[-1];
^ ~~
aa.c:48:5: note: array 'abc' declared here
int abc[10] = {0};
^
4 warnings generated.
[root@kwephicprd11837 test]# ./main
hello
nihao!
huaidan

==28940==ERROR: AddressSanitizer: stack-buffer-overflow on address 0xffffc34a24d0 at pc 0x0000004e9b90 bp 0xffffc34a2460 sp 0xffffc34a2478
READ of size 4 at 0xffffc34a24d0 thread T0
#0 0x4e9b8c in main /home/hss/test/aa.c:46:13
#1 0xffffafe3eadc in __libc_start_main (/lib64/libc.so.6+0x20adc)
#2 0x423098 in _start (/home/hss/test/main+0x423098)

Address 0xffffc34a24d0 is located in stack of thread T0 at offset 80 in frame
#0 0x4e995c in main /home/hss/test/aa.c:38

This frame has 2 object(s):
[32, 80) 'a' (line 45) <== Memory access at offset 80 overflows this variable
[112, 152) 'abc' (line 48)
HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork
(longjmp and C++ exceptions are supported)
SUMMARY: AddressSanitizer: stack-buffer-overflow /home/hss/test/aa.c:46:13 in main
Shadow bytes around the buggy address:
0x200ff8694440: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x200ff8694450: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x200ff8694460: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x200ff8694470: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x200ff8694480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x200ff8694490: f1 f1 f1 f1 00 00 00 00 00 00[f2]f2 f2 f2 f8 f8
0x200ff86944a0: f8 f8 f8 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00
0x200ff86944b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x200ff86944c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x200ff86944d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x200ff86944e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
Shadow gap: cc

==28940==ERROR: AddressSanitizer: stack-buffer-overflow on address 0xffffc34a24ec at pc 0x0000004e9c18 bp 0xffffc34a2460 sp 0xffffc34a2478
READ of size 4 at 0xffffc34a24ec thread T0
#0 0x4e9c14 in main /home/hss/test/aa.c:49:14
#1 0xffffafe3eadc in __libc_start_main (/lib64/libc.so.6+0x20adc)
#2 0x423098 in _start (/home/hss/test/main+0x423098)

Address 0xffffc34a24ec is located in stack of thread T0 at offset 108 in frame
#0 0x4e995c in main /home/hss/test/aa.c:38

This frame has 2 object(s):
[32, 80) 'a' (line 45)
[112, 152) 'abc' (line 48) <== Memory access at offset 108 underflows this variable
HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork
(longjmp and C++ exceptions are supported)
SUMMARY: AddressSanitizer: stack-buffer-overflow /home/hss/test/aa.c:49:14 in main
Shadow bytes around the buggy address:
0x200ff8694440: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x200ff8694450: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x200ff8694460: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x200ff8694470: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x200ff8694480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x200ff8694490: f1 f1 f1 f1 00 00 00 00 00 00 f2 f2 f2[f2]00 00
0x200ff86944a0: 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00
0x200ff86944b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x200ff86944c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x200ff86944d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x200ff86944e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
Shadow gap: cc
28940
15096
q
[root@kwephicprd11837 test]#
[root@kwephicprd11837 test]#
[root@kwephicprd11837 test]# clang aa.c -o main -g -O0 -fsanitize=hwaddress -fsanitize-recover=hwaddress,all
aa.c:25:13: warning: implicitly declaring library function 'strstr' with type 'char *(const char *, const char *)' [-Wimplicit-function-declaration]
if (strstr(line_buff, "VmRSS:") != NULL)
^
aa.c:25:13: note: include the header <string.h> or explicitly provide a declaration for 'strstr'
aa.c:50:16: warning: implicit declaration of function 'getpid' is invalid in C99 [-Wimplicit-function-declaration]
int ppid = getpid();
^
aa.c:46:13: warning: array index 12 is past the end of the array (which contains 12 elements) [-Warray-bounds]
int b = a[12];
^ ~~
aa.c:45:5: note: array 'a' declared here
int a[12] = {0};
^
aa.c:49:14: warning: array index -1 is before the beginning of the array [-Warray-bounds]
int cc = abc[-1];
^ ~~
aa.c:48:5: note: array 'abc' declared here
int abc[10] = {0};
^
4 warnings generated.
[root@kwephicprd11837 test]# ./main
==29280==ERROR: HWAddressSanitizer: tag-mismatch on address 0xffffe901ff90 at pc 0xaaaabc9124d8
READ of size 4 at 0xffffe901ff90 tags: 97/00 (ptr/mem) in thread T0
#0 0xaaaabc9124d4 in main /home/hss/test/aa.c:46:13
#1 0xffffa6b70adc in __libc_start_main (/lib64/libc.so.6+0x20adc)
#2 0xaaaabc8d43bc in _start (/home/hss/test/main+0x63bc)

LLVMSymbolizer: error reading file: No such file or directory
0xffffe901ff90 is located 130960 bytes to the right of 0-byte global variable ?? [0xffffe9000000,0xffffe9000000) in [stack]
Address 0xffffe901ff90 is located in stack of thread T0
Thread: T0 0xeffe00002000 stack: [0xffffe8822000,0xffffe9022000) sz: 8388608 tls: [0xffffa6e7cb70,0xffffa6e7d2c0)
Previously allocated frames:
record_addr:0xffffa6b284b8 record:0x1ffaaaaabc9120f8 in main /home/hss/test/aa.c:38
Memory tags around the buggy address (one tag corresponds to 16 bytes):
0xfffefe901f70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe901f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe901f90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe901fa0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe901fb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe901fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe901fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe901fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0xfffefe901ff0: 00 00 17 17 08 00 97 97 97 [00] 00 00 00 00 00 00
0xfffefe902000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe902010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe902020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe902030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe902040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe902050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe902060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe902070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Tags for short granules around the buggy address (one tag corresponds to 16 bytes):
0xfffefe901fe0: .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ..
=>0xfffefe901ff0: .. .. .. .. 17 .. .. .. .. [..] .. .. .. .. .. ..
0xfffefe902000: .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ..
See https://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html#short-granules for a description of short granule tags
SUMMARY: HWAddressSanitizer: tag-mismatch /home/hss/test/aa.c:46:13 in main
==29280==ERROR: HWAddressSanitizer: tag-mismatch on address 0xffffe901ff1c at pc 0xaaaabc912648
READ of size 4 at 0xffffe901ff1c tags: 17/00 (ptr/mem) in thread T0
#0 0xaaaabc912644 in main /home/hss/test/aa.c:49:14
#1 0xffffa6b70adc in __libc_start_main (/lib64/libc.so.6+0x20adc)
#2 0xaaaabc8d43bc in _start (/home/hss/test/main+0x63bc)

0xffffe901ff1c is located -130844 bytes to the left of 0-byte global variable ?? [0xffffe9000000,0xffffe9000000) in [stack]
Address 0xffffe901ff1c is located in stack of thread T0
Previously allocated frames:
record_addr:0xffffa6b284b8 record:0x1ffaaaaabc9120f8 in main /home/hss/test/aa.c:38
Memory tags around the buggy address (one tag corresponds to 16 bytes):
0xfffefe901f70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe901f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe901f90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe901fa0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe901fb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe901fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe901fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe901fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0xfffefe901ff0: 00 [00] 17 17 08 00 97 97 97 00 00 00 00 00 00 00
0xfffefe902000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe902010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe902020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe902030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe902040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe902050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe902060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0xfffefe902070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Tags for short granules around the buggy address (one tag corresponds to 16 bytes):
0xfffefe901fe0: .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ..
=>0xfffefe901ff0: .. [..] .. .. 17 .. .. .. .. .. .. .. .. .. .. ..
0xfffefe902000: .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ..
See https://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html#short-granules for a description of short granule tags
SUMMARY: HWAddressSanitizer: tag-mismatch /home/hss/test/aa.c:49:14 in main
[root@kwephicprd11837 test]#
[root@kwephicprd11837 test]# cat aa.c
#include <stdio.h>

int get_memory_by_pid(int p)
{
FILE *fd;
char name[32], line_buff[256] = {0}, file[64] = {0};
int i, vmrss = 0;

sprintf(file, "/proc/%d/status", p);
// 以R读的方式打开文件再赋给指针fd
fd = fopen(file, "r");
if(fd==NULL)
{
    return -1;
}

// 读取VmRSS这一行的数据
for (i = 0; i < 70; i++)
{
    if (fgets(line_buff, sizeof(line_buff), fd) == NULL)
    {
        break;
    }
    if (strstr(line_buff, "VmRSS:") != NULL)
    {
        sscanf(line_buff, "%s %d", name, &vmrss);
        break;
    }
}

fclose(fd);

return vmrss;

}

int main() {
printf("hello\r\n");
fflush(stdout);
printf("nihao!\n");
fflush(stdout);
printf("huaidan\n");
fflush(stdout);
int a[12] = {0};
int b = a[12];

int abc[10] = {0};
int cc = abc[-1];
int ppid = getpid();
printf("%d\n",ppid);	
printf("%d\n",get_memory_by_pid(ppid));
getchar();
return 0;

}
[root@kwephicprd11837 test]#
Can someone help you with that? Thank you very much!

[shisuhao]

two questions:
1、Why is the printf function not output?
2、why getchar() does not work？

[kcc]

Is this x86_64 or AArch64?
On x86_64, HWASAN is not really supported (it works only to the extent that tiny tests can work)

[shisuhao]

On x86_64, HWASAN is not really supported (it works only to the extent that tiny tests can work)
thanks.the follow:
[root@kwephicprd11837 test]# uname -a
Linux kwephicprd11837 4.19.25-vhulk1902.3.1.h128.eulerosv3r1.aarch64 #1 SMP Tue Feb 12 00:00:00 UTC 2019 aarch64 aarch64 aarch64 GNU/Linux
[root@kwephicprd11837 test]# uname -r
4.19.25-vhulk1902.3.1.h128.eulerosv3r1.aarch64
[root@kwephicprd11837 test]#

is aarch64 and it does not work?

[shisuhao]

@kcc Can you give me some advice?

[shisuhao]

I switched to an Aarch64 device, and I got this.followed:

[root@localhost test]# cat test.c
#include <stdio.h>

int a[16] = {0};

int main() {
//printf("hello \n");
//int a[10] = {0};
int b = a[16];
return 0;
}
[root@localhost test]# clang test.c -o main -g -fsanitize=address -fno-omit-frame-pointer
test.c:8:13: warning: array index 16 is past the end of the array (which contains 16 elements) [-Warray-bounds]
int b = a[16];
^ ~~
test.c:3:1: note: array 'a' declared here
int a[16] = {0};
^
1 warning generated.
[root@localhost test]# ./main

==6701==ERROR: AddressSanitizer: global-buffer-overflow on address 0x000000e99520 at pc 0x0000004df978 bp 0xffffccd95aa0 sp 0xffffccd95ab8
READ of size 4 at 0x000000e99520 thread T0
#0 0x4df974 in main /home/hss/test/test.c:8:13
#1 0xffff9af00d20 in __libc_start_main (/lib64/libc.so.6+0x20d20)
#2 0x422f80 in _start (/home/hss/test/main+0x422f80)

0x000000e99520 is located 0 bytes to the right of global variable 'a' defined in 'test.c:3:5' (0xe994e0) of size 64
SUMMARY: AddressSanitizer: global-buffer-overflow /home/hss/test/test.c:8:13 in main
Shadow bytes around the buggy address:
0x0010001d3250: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0010001d3260: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0010001d3270: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0010001d3280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0010001d3290: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0010001d32a0: 00 00 00 00[f9]f9 f9 f9 00 00 00 00 00 00 00 00
0x0010001d32b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0010001d32c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0010001d32d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0010001d32e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0010001d32f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
Shadow gap: cc
==6701==ABORTING
[root@localhost test]#
[root@localhost test]# clang test.c -o main -g -fsanitize=hwaddress -fno-omit-frame-pointer -v
clang version 10.0.0
Target: aarch64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
Found candidate GCC installation: /usr/lib/gcc/aarch64-redhat-linux/8
Selected GCC installation: /usr/lib/gcc/aarch64-redhat-linux/8
Candidate multilib: .;@m64
Selected multilib: .;@m64
"/usr/local/bin/clang-10" -cc1 -triple aarch64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -discard-value-names -main-file-name test.c -mrelocation-model pic -pic-level 2 -pic-is-pie -mthread-model posix -mframe-pointer=non-leaf -fmath-errno -fno-rounding-math -masm-verbose -mconstructor-aliases -munwind-tables -target-cpu generic -target-feature +neon -target-abi aapcs -fallow-half-arguments-and-returns -dwarf-column-info -fno-split-dwarf-inlining -debug-info-kind=limited -dwarf-version=4 -debugger-tuning=gdb -v -resource-dir /usr/local/lib/clang/10.0.0 -internal-isystem /usr/local/include -internal-isystem /usr/local/lib/clang/10.0.0/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdebug-compilation-dir /home/hss/test -ferror-limit 19 -fmessage-length 0 -fsanitize=hwaddress -fsanitize-system-blacklist=/usr/local/lib/clang/10.0.0/share/hwasan_blacklist.txt -default-function-attr hwasan-abi=interceptor -target-feature +tagged-globals -fno-signed-char -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -faddrsig -o /tmp/test-aeafdd.o -x c test.c
clang -cc1 version 10.0.0 based upon LLVM 10.0.0 default target aarch64-unknown-linux-gnu
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/usr/local/lib/clang/10.0.0/include
/usr/include
End of search list.
test.c:8:13: warning: array index 16 is past the end of the array (which contains 16 elements) [-Warray-bounds]
int b = a[16];
^ ~~
test.c:3:1: note: array 'a' declared here
int a[16] = {0};
^
1 warning generated.
"/usr/bin/ld" -pie -EL --eh-frame-hdr -m aarch64linux -dynamic-linker /lib/ld-linux-aarch64.so.1 -o main /usr/lib/gcc/aarch64-redhat-linux/8/../../../../lib64/Scrt1.o /usr/lib/gcc/aarch64-redhat-linux/8/../../../../lib64/crti.o /usr/lib/gcc/aarch64-redhat-linux/8/crtbeginS.o -L/usr/lib/gcc/aarch64-redhat-linux/8 -L/usr/lib/gcc/aarch64-redhat-linux/8/../../../../lib64 -L/usr/local/bin/../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/usr/lib/gcc/aarch64-redhat-linux/8/../../.. -L/usr/local/bin/../lib -L/lib -L/usr/lib --whole-archive /usr/local/lib/clang/10.0.0/lib/linux/libclang_rt.hwasan-aarch64.a --no-whole-archive --dynamic-list=/usr/local/lib/clang/10.0.0/lib/linux/libclang_rt.hwasan-aarch64.a.syms /tmp/test-aeafdd.o --no-as-needed -lpthread -lrt -lm -ldl -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/aarch64-redhat-linux/8/crtendS.o /usr/lib/gcc/aarch64-redhat-linux/8/../../../../lib64/crtn.o
/usr/bin/ld: /tmp/test-aeafdd.o: unrecognized relocation (0x125) in section `.text'
/usr/bin/ld: Is this version of the linker - version 2.30-49.el8 - out of date ?
/usr/bin/ld: 最后的链结失败: 错误的值
clang-10: error: linker command failed with exit code 1 (use -v to see invocation)
[root@localhost test]#
[root@localhost test]#
[root@localhost test]# uname -r
4.18.0-80.el8.aarch64
[root@localhost test]# uname -a
Linux localhost.localdomain 4.18.0-80.el8.aarch64 #1 SMP Thu Jun 6 16:45:46 UTC 2019 aarch64 aarch64 aarch64 GNU/Linux
[root@localhost test]#