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Fix segmentation fault if a NOBITS section is specified as a source section

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This commit is contained in:
Mario Hüttel 2023-01-04 15:04:06 +01:00
parent 5b86194734
commit e09a07b3d3
2 changed files with 14 additions and 3 deletions
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10
src/elfpatch.c
View File

@ -423,8 +423,16 @@ int elf_patch_compute_crc_over_section(elfpatch_handle_t *ep, const char *sectio
} }
print_debug("Section data length: %lu\n", data->d_size); print_debug("Section data length: %lu\n", data->d_size);
if (!data->d_size) if (!data->d_size) {
print_err("Section %s contains no data.\n", section); print_err("Section %s contains no data.\n", section);
return -2;
}
/* NOBIT sections have a length but no data in the file. Abort in this case */
if (!data->d_buf) {
print_err("Section %s does not contain loadable data.\n", section);
return -2;
}
/* If big endian or granularity is byte, simply compute CRC. No reordering is necessary */ /* If big endian or granularity is byte, simply compute CRC. No reordering is necessary */
if (!little_endian || granularity == GRANULARITY_BYTE) { if (!little_endian || granularity == GRANULARITY_BYTE) {

7
src/main.c
View File

@ -407,12 +407,14 @@ int main(int argc, char **argv)
/* Check if all sections are present */ /* Check if all sections are present */
if (check_all_sections_present(ep, cmd_opts.section_list)) { if (check_all_sections_present(ep, cmd_opts.section_list)) {
ret = -2; ret = -2;
goto free_cmds; goto ret_close_elf;
} }
/* Compute CRCs over sections */ /* Compute CRCs over sections */
crcs = (uint32_t *)malloc(sl_list_length(cmd_opts.section_list) * sizeof(uint32_t)); crcs = (uint32_t *)malloc(sl_list_length(cmd_opts.section_list) * sizeof(uint32_t));
compute_crcs(ep, cmd_opts.section_list, &cmd_opts, crcs); if (compute_crcs(ep, cmd_opts.section_list, &cmd_opts, crcs)) {
goto ret_close_elf;
}
if (reporting_get_verbosity()) { if (reporting_get_verbosity()) {
print_crcs(cmd_opts.section_list, crcs); print_crcs(cmd_opts.section_list, crcs);
@ -427,6 +429,7 @@ int main(int argc, char **argv)
} }
} }
ret_close_elf:
elf_patch_close_and_free(ep); elf_patch_close_and_free(ep);
free_cmds: free_cmds: