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| author | Masahiro Yamada <masahiroy@kernel.org> | 2020-05-25 14:47:04 +0900 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2020-05-29 03:08:49 +0900 |
| commit | d2e4d05cf1a1f8bfe168ea29b217355be7a4e9ec (patch) | |
| tree | 373da7abf7f2cd1b0f16b19003349f9c430c0461 /Makefile | |
| parent | e9e81b634303b215e83beced03f04f02f7893442 (diff) | |
modpost: fix potential segmentation fault for addend_i386_rel()
This may not be a practical problem, but the second pass of ARCH=i386
modpost causes segmentation fault if the -s option is not passed.
MODPOST 12 modules
Segmentation fault (core dumped)
make[2]: *** [scripts/Makefile.modpost:94: __modpost] Error 139
make[1]: *** [Makefile:1339: modules] Error 2
make[1]: *** Waiting for unfinished jobs....
The segmentation fault occurs when section_rel() is called for vmlinux,
which is untested in regular builds. The cause of the problem is
reloc_location() returning a wrong pointer for ET_EXEC object type.
In this case, you need to subtract sechdr->sh_addr, otherwise it would
get access beyond the mmap'ed memory.
Add sym_get_data_by_offset() helper to avoid code duplication.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Diffstat (limited to 'Makefile')
0 files changed, 0 insertions, 0 deletions