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* [Bug sanitizer/107086] New: gcc trunkc at -O1 failed to detect a stack-use-after-return
@ 2022-09-29 12:14 shaohua.li at inf dot ethz.ch
2022-09-29 12:34 ` [Bug sanitizer/107086] " marxin at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: shaohua.li at inf dot ethz.ch @ 2022-09-29 12:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107086
Bug ID: 107086
Summary: gcc trunkc at -O1 failed to detect a
stack-use-after-return
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: sanitizer
Assignee: unassigned at gcc dot gnu.org
Reporter: shaohua.li at inf dot ethz.ch
CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
jakub at gcc dot gnu.org, kcc at gcc dot gnu.org, marxin at gcc dot gnu.org
Target Milestone: ---
%gcc-tk -v
Using built-in specs.
COLLECT_GCC=gcc-tk
COLLECT_LTO_WRAPPER=/zdata/shaoli/compilers/ccbuilder-compilers/gcc-519196a27cf534e94f158733b25a4f9d10737031/libexec/gcc/x86_64-pc-linux-gnu/13.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --disable-multilib --disable-bootstrap
--enable-languages=c,c++
--prefix=/zdata/shaoli/compilers/ccbuilder-compilers/gcc-519196a27cf534e94f158733b25a4f9d10737031
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.0.0 20220921 (experimental) (GCC)
%
%cat a.c
int a, b;
int *c;
int d() { return 0; }
static int e(int f) {
int h[144];
for (; b;)
h;
for (; a >= 0; a = -2)
c = &f;
return f;
}
int main() {
e(0);
*c = 0;
if (d()) {
int g[28];
g;
}
}
%
%
%gcc-tk -O1 -w -fsanitize=address a.c && ./a.out
%
%gcc-tk -O2 -w -fsanitize=address a.c && ./a.out
=================================================================
==491884==ERROR: AddressSanitizer: stack-use-after-return on address
0x7f9cd1000020 at pc 0x0000004010e1 bp 0x7ffe4ecb6150 sp 0x7ffe4ecb6148
WRITE of size 4 at 0x7f9cd1000020 thread T0
#0 0x4010e0 in main
/zdata/shaoli/SanitizerFuzz/csmith-only/asan/dangling-ptr-deref-prob-10/bugs/gcc_work102_8/a.c:14
#1 0x7f9cd3a71082 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x24082) (BuildId:
1878e6b475720c7c51969e69ab2d276fae6d1dee)
#2 0x40114d in _start
(/zdata/shaoli/SanitizerFuzz/csmith-only/asan/dangling-ptr-deref-prob-10/bugs/gcc_work102_8/a.out+0x40114d)
Address 0x7f9cd1000020 is located in stack of thread T0 at offset 32 in frame
#0 0x40121f in e
/zdata/shaoli/SanitizerFuzz/csmith-only/asan/dangling-ptr-deref-prob-10/bugs/gcc_work102_8/a.c:4
This frame has 1 object(s):
[32, 36) 'f' (line 4) <== Memory access at offset 32 is inside 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-use-after-return
/zdata/shaoli/SanitizerFuzz/csmith-only/asan/dangling-ptr-deref-prob-10/bugs/gcc_work102_8/a.c:14
in main
Shadow bytes around the buggy address:
0x0ff41a1f7fb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ff41a1f7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ff41a1f7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ff41a1f7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ff41a1f7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0ff41a1f8000: f5 f5 f5 f5[f5]f5 f5 f5 00 00 00 00 00 00 00 00
0x0ff41a1f8010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ff41a1f8020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ff41a1f8030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ff41a1f8040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0ff41a1f8050: 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
==491884==ABORTING
%
Compiler explorer: https://godbolt.org/z/rn9qjrb5K
From the assembly code, we can see that the reason probably is the function
`e()` got inlined so that the stack variable didn't get instrumented.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2022-09-29 12:14 [Bug sanitizer/107086] New: gcc trunkc at -O1 failed to detect a stack-use-after-return shaohua.li at inf dot ethz.ch
2022-09-29 12:34 ` [Bug sanitizer/107086] " marxin at gcc dot gnu.org
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