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More strict verification of ELF header

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This commit is contained in:
Alex Kotov 2020-11-25 23:18:40 +05:00
parent 8a4f3a08ea
commit c85584eea7
Signed by: kotovalexarian
GPG key ID: 553C0EBBEB5D5F08
1 changed files with 7 additions and 4 deletions
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11
kernelmq/elf.h
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@ -20,12 +20,12 @@ struct KernelMQ_ELF_Header {
unsigned short isa : 16; // Must be 3 (x86). unsigned short isa : 16; // Must be 3 (x86).
unsigned long elf_version : 32; // Must be 1. unsigned long elf_version : 32; // Must be 1.
unsigned long entrypoint : 32; unsigned long entrypoint : 32;
unsigned long prog_table_pos : 32; unsigned long prog_table_pos : 32; // Must not be 0.
unsigned long sect_table_pos : 32; unsigned long sect_table_pos : 32;
unsigned long arch_flags : 32; // Must be 0. unsigned long arch_flags : 32; // Must be 0.
unsigned short header_size : 16; // Must be 52. unsigned short header_size : 16; // Must be 52.
unsigned short prog_entr_size : 16; unsigned short prog_entr_size : 16; // Must not be 0.
unsigned short prog_entr_num : 16; unsigned short prog_entr_num : 16; // Must not be 0.
unsigned short sect_entr_size : 16; unsigned short sect_entr_size : 16;
unsigned short sect_entr_num : 16; unsigned short sect_entr_num : 16;
unsigned short sect_names_idx : 16; unsigned short sect_names_idx : 16;
@ -82,7 +82,10 @@ unsigned char KernelMQ_ELF_Header_is_valid(
header->isa == 3 && header->isa == 3 &&
header->elf_version == 1 && header->elf_version == 1 &&
header->arch_flags == 0 && header->arch_flags == 0 &&
header->header_size == 52 header->header_size == 52 &&
header->prog_table_pos != 0 &&
header->prog_entr_size != 0 &&
header->prog_entr_num != 0
); );
} }