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LibELF: validate_program_headers: Validate p_memsz and p_align
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74a65cffbd
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sideshowbarker
2024-07-19 00:16:58 +09:00
Author: https://github.com/bcoles Commit: https://github.com/SerenityOS/serenity/commit/74a65cffbd8 Pull-request: https://github.com/SerenityOS/serenity/pull/4704 Issue: https://github.com/SerenityOS/serenity/issues/4566
@ -200,6 +200,20 @@ bool validate_program_headers(const Elf32_Ehdr& elf_header, size_t file_size, co
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return false;
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}
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if (program_header.p_memsz <= 0 && (program_header.p_type == PT_TLS || program_header.p_type == PT_LOAD)) {
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if (verbose)
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dbgln("Program header ({}) has invalid size in memory ({})", header_index, program_header.p_memsz);
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return false;
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}
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if (program_header.p_type == PT_LOAD && program_header.p_align != PAGE_SIZE) {
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if (elf_header.e_type != ET_CORE) {
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if (verbose)
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dbgln("Program header ({}) with p_type PT_LOAD has p_align ({}) not equal to page size ({})", header_index, program_header.p_align, PAGE_SIZE);
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return false;
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}
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}
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switch (program_header.p_type) {
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case PT_INTERP:
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// We checked above that file_size was >= buffer size. We only care about buffer size anyway, we're trying to read this!
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