https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107973
Bug ID: 107973
Summary: wrong warning with -Werror -fsanitize=address
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: bernd.edlinger at hotmail dot de
Target Milestone: ---
when compiling openssl-1.1.1s with the following workflow:
$ wget https://www.openssl.org/source/openssl-1.1.1s.tar.gz
$ tar xf openssl-1.1.1s.tar.gz
$ cd openssl-1.1.1s
$ ./config --strict-warnings enable-asan
$ make
I get this unexpected warning (error)
gcc -I. -Iinclude -fPIC -pthread -m64 -fsanitize=address
-fno-omit-frame-pointer -g -Wa,--noexecstack -Wall -O3 -DDEBUG_UNUSED
-DPEDANTIC -pedantic -Wno-long-long -Wall -Wextra -Wno-unused-parameter
-Wno-missing-field-initializers -Wswitch -Wsign-compare -Wshadow -Wformat
-Wtype-limits -Wundef -Werror -Wmissing-prototypes -Wstrict-prototypes
-DOPENSSL_USE_NODELETE -DL_ENDIAN -DOPENSSL_PIC -DOPENSSL_CPUID_OBJ
-DOPENSSL_IA32_SSE2 -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_MONT5
-DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DKECCAK1600_ASM
-DRC4_ASM -DMD5_ASM -DAESNI_ASM -DVPAES_ASM -DGHASH_ASM -DECP_NISTZ256_ASM
-DX25519_ASM -DPOLY1305_ASM -DOPENSSLDIR="\"/usr/local/ssl\""
-DENGINESDIR="\"/usr/local/lib/engines-1.1\"" -DNDEBUG -MMD -MF
ssl/s3_enc.d.tmp -MT ssl/s3_enc.o -c -o ssl/s3_enc.o ssl/s3_enc.c
In function 'ssl3_generate_key_block',
inlined from 'ssl3_setup_key_block' at ssl/s3_enc.c:290:11:
ssl/s3_enc.c:48:20: error: writing 1 byte into a region of size 0
[-Werror=stringop-overflow=]
48 | buf[j] = c;
| ~~~~~~~^~~
ssl/s3_enc.c: In function 'ssl3_setup_key_block':
ssl/s3_enc.c:21:19: note: at offset 16 into destination object 'buf' of size 16
21 | unsigned char buf[16], smd[SHA_DIGEST_LENGTH];
| ^~~
cc1: all warnings being treated as errors
this happens with:
gcc version 12.2.1 20221130 (GCC)
gcc version 11.3.1 20221205 (GCC)
gcc version 10.4.1 20221205 (GCC)
but did not happen with:
gcc version 9.5.0 (GCC)
nor does it happen with:
gcc version 13.0.0 20221130 (experimental) (GCC)
It is pretty annoying because this happens in CI builds
once we change from ubuntu-20.04 (gcc9) to ubuntu-22.04 (gcc11)
