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LibELF: Validate PT_GNU_RELRO program header

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I'm not sure if this is the correct validation. This is based on
it being "read-only after relocation".
This commit is contained in:
Luke 2020-09-09 08:40:17 +01:00 • committed by Andreas Kling
parent 9d8f1032b7
commit b3be275cf7
1 changed files with 6 additions and 0 deletions
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6
Libraries/LibELF/Validation.cpp
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@ -202,6 +202,12 @@ bool validate_program_headers(const Elf32_Ehdr& elf_header, size_t file_size, u8
dbgprintf("Possible shenanigans! Validating an ELF with executable stack.\n"); dbgprintf("Possible shenanigans! Validating an ELF with executable stack.\n");
} }
break; break;
case PT_GNU_RELRO:
if ((program_header.p_flags & PF_X) && (program_header.p_flags & PF_W)) {
dbgprintf("SHENANIGANS! Program header %zu segment is marked write and execute\n", header_index);
return false;
}
break;
default: default:
// Not handling other program header types in other code so... let's not surprise them // Not handling other program header types in other code so... let's not surprise them
dbgprintf("Found program header (%zu) of unrecognized type %x!\n", header_index, program_header.p_type); dbgprintf("Found program header (%zu) of unrecognized type %x!\n", header_index, program_header.p_type);