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| author | Alexander Egorenov <eaibmz@gmail.com> | 2022-01-14 13:48:36 +0100 |
|---|---|---|
| committer | Dmitry Vyukov <dvyukov@google.com> | 2022-01-17 10:41:55 +0100 |
| commit | 731a2d2337bad25ba97f688a5f13df7238fdc4f2 (patch) | |
| tree | 90295437ea732db1044d2fc1d61e9ed389de88dd /sys | |
| parent | 723cfaf0e55347c804a236591f9d0070fc7f46cb (diff) | |
sys/targets: disable some GCC warnings reported for C reproducers
Disable GCC warnings:
* stringop-overflow
* array-bounds
* format-overflow
These warnings generate false positives for C reproducers which cause
GCC to fail if -Werror is given.
This commit fixes the following false positives:
/root/test.c: In function ‘main’:
/root/test.c:88:50: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
88 | NONFAILING(*(uint8_t*)0x20000088 = 3);
/root/test.c:85:28: error: ‘memcpy’ offset [0, 23] is out of the bounds [0, 0] [-Werror=array-bounds]
85 | NONFAILING(memcpy((void*)0x20000040, "\001\000\000\000\002\000\000\000\003\000\004\000\000\000\000\000\005\000\000\000\000\000\000\000", 24));
<stdin>:86:40: error: ‘%023llo’ directive writing 23 bytes into a region of size 0 [-Werror=format-overflow=]
<stdin>:43:123: note: in definition of macro ‘NONFAILING’
GCC stringop-overflow bug reports:
- https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88443
syzkaller group discussion:
- https://groups.google.com/g/syzkaller/c/PIEYPflPWhQ
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/targets/targets.go | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sys/targets/targets.go b/sys/targets/targets.go index c61e679bc..f3be708f3 100644 --- a/sys/targets/targets.go +++ b/sys/targets/targets.go @@ -554,12 +554,18 @@ var ( "-Wparentheses", "-Wunused-const-variable", "-Wframe-larger-than=16384", // executor uses stacks of limited size, so no jumbo frames + "-Wno-stringop-overflow", + "-Wno-array-bounds", + "-Wno-format-overflow", } optionalCFlags = map[string]bool{ "-static": true, // some distributions don't have static libraries "-static-pie": true, // this flag is also not supported everywhere "-Wunused-const-variable": true, // gcc 5 does not support this flag "-fsanitize=address": true, // some OSes don't have ASAN + "-Wno-stringop-overflow": true, + "-Wno-array-bounds": true, + "-Wno-format-overflow": true, } fallbackCFlags = map[string]string{ "-static-pie": "-static", // if an ASLR static binary is impossible, build just a static one |