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termux-elf-cleaner: Better error messages

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This commit is contained in:
Fredrik Fornwall 2015-08-19 15:21:41 -04:00
parent 6f553afd6b
commit 009c8d9453
1 changed files with 21 additions and 14 deletions
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35
packages/termux-tools/termux-elf-cleaner.cpp
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@ -20,17 +20,17 @@
template<typename ElfHeaderType /*Elf{32,64}_Ehdr*/,
typename ElfSectionHeaderType /*Elf{32,64}_Shdr*/,
typename ElfDynamicSectionEntryType /* Elf{32,64}_Dyn */>
bool process_elf(uint8_t* bytes, size_t elf_file_size)
bool process_elf(uint8_t* bytes, size_t elf_file_size, char const* file_name)
{
if (sizeof(ElfSectionHeaderType) > elf_file_size) {
fprintf(stderr, "ERROR: Elf header would end at %zu but file size only %zu\n", sizeof(ElfSectionHeaderType), elf_file_size);
fprintf(stderr, "termux-elf-cleaner: Elf header for '%s' would end at %zu but file size only %zu\n", file_name, sizeof(ElfSectionHeaderType), elf_file_size);
return false;
}
ElfHeaderType* elf_hdr = reinterpret_cast<ElfHeaderType*>(bytes);
size_t last_section_header_byte = elf_hdr->e_shoff + sizeof(ElfSectionHeaderType) * elf_hdr->e_shnum;
if (last_section_header_byte > elf_file_size) {
fprintf(stderr, "ERROR: Section header would end at %zu but file size only %zu\n", last_section_header_byte, elf_file_size);
fprintf(stderr, "termux-elf-cleaner: Section header for '%s' would end at %zu but file size only %zu\n", file_name, last_section_header_byte, elf_file_size);
return false;
}
ElfSectionHeaderType* section_header_table = reinterpret_cast<ElfSectionHeaderType*>(bytes + elf_hdr->e_shoff);
@ -40,7 +40,7 @@ bool process_elf(uint8_t* bytes, size_t elf_file_size)
if (section_header_entry->sh_type == SHT_DYNAMIC) {
size_t const last_dynamic_section_byte = section_header_entry->sh_offset + section_header_entry->sh_size;
if (last_dynamic_section_byte > elf_file_size) {
fprintf(stderr, "ERROR: Dynamic section would end at %zu but file size only %zu\n", last_dynamic_section_byte, elf_file_size);
fprintf(stderr, "termux-elf-cleaner: Dynamic section for '%s' would end at %zu but file size only %zu\n", file_name, last_dynamic_section_byte, elf_file_size);
return false;
}
@ -67,7 +67,7 @@ bool process_elf(uint8_t* bytes, size_t elf_file_size)
case DT_RUNPATH: removed_name = "DT_RUNPATH"; break;
}
if (removed_name != nullptr) {
printf("Removing the %s dynamic section entry\n", removed_name);
printf("termux-elf-cleaner: Removing the %s dynamic section entry from '%s'\n", removed_name, file_name);
// Tag the entry with DT_NULL and put it last:
dynamic_section_entry->d_tag = DT_NULL;
// Decrease j to process new entry index:
@ -80,7 +80,7 @@ bool process_elf(uint8_t* bytes, size_t elf_file_size)
}
int main(int argc, char **argv)
int main(int argc, char const** argv)
{
if (argc < 2 || (argc == 2 && strcmp(argv[1], "-h")==0)) {
fprintf(stderr, "usage: %s <filename>\n", argv[0]);
@ -90,7 +90,8 @@ int main(int argc, char **argv)
}
for (int i = 1; i < argc; i++) {
int fd = open(argv[i], O_RDWR);
char const* file_name = argv[i];
int fd = open(file_name, O_RDWR);
if (fd < 0) { perror("open()"); return 1; }
struct stat st;
@ -103,19 +104,25 @@ int main(int argc, char **argv)
uint8_t* bytes = reinterpret_cast<uint8_t*>(mem);
if (!(bytes[0] == 0x7F && bytes[1] == 'E' && bytes[2] == 'L' && bytes[3] == 'F')) {
// Not the ELF magic number.
munmap(mem, st.st_size);
close(fd);
continue;
}
uint8_t bit_value = bytes[4];
if (!(bit_value == 1 || bit_value == 2)) {
printf("ERROR: Incorrect bit value: %d\n", bit_value);
return 1;
} else if (bit_value == 1) {
if (!process_elf<Elf32_Ehdr, Elf32_Shdr, Elf32_Dyn>(bytes, st.st_size)) return 1;
if (bytes[/*EI_DATA*/5] != 1) {
fprintf(stderr, "termux-elf-cleaner: Not little endianness in '%s'\n", file_name);
continue;
}
uint8_t const bit_value = bytes[/*EI_CLASS*/4];
if (bit_value == 1) {
if (!process_elf<Elf32_Ehdr, Elf32_Shdr, Elf32_Dyn>(bytes, st.st_size, file_name)) return 1;
} else if (bit_value == 2) {
if (!process_elf<Elf64_Ehdr, Elf64_Shdr, Elf64_Dyn>(bytes, st.st_size, file_name)) return 1;
} else {
if (!process_elf<Elf64_Ehdr, Elf64_Shdr, Elf64_Dyn>(bytes, st.st_size)) return 1;
printf("termux-elf-cleaner: Incorrect bit value %d in '%s'\n", bit_value, file_name);
return 1;
}
if (msync(mem, st.st_size, MS_SYNC) < 0) { perror("msync()"); return 1; }