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kpatch-elf: fix Segmentation fault when d_type not set properly 

kpatch-elf::create_section_pair would create new rela section, and the
relasec->data->d_type is not set, which is a random value, and it will
use in kpatch-elf::kpatch_write_output_elf
	data->d_type = sec->data->d_type;
which would cause Segmentation fault in kpatch_write_output_elf::elf_update.

Program received signal SIGSEGV, Segmentation fault.
(gdb) bt
0  0x00007ffff7bcd8d2 in __elf64_updatefile at elf64_updatefile.c
1  0x00007ffff7bc9bed in write_file at elf_update.c
2  0x00007ffff7bc9f16 in elf_update at elf_update.c
3  0x000000000040ca3d in kpatch_write_output_elf at kpatch-elf.c
4  0x0000000000409a92 in main at create-diff-object.c

Signed-off-by: chenzefeng <chenzefeng2@huawei.com>
This commit is contained in:
chenzefeng 2019-06-03 10:26:55 +08:00
parent 0cdc2a3757
commit 23c232d3c1
1 changed files with 1 additions and 0 deletions
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1
kpatch-build/kpatch-elf.c
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@ -647,6 +647,7 @@ struct section *create_section_pair(struct kpatch_elf *kelf, char *name,
relasec->data = malloc(sizeof(*relasec->data));
if (!relasec->data)
ERROR("malloc");
relasec->data->d_type = ELF_T_RELA;
/* set section header */
relasec->sh.sh_type = SHT_RELA;