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Validate ELF header

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This commit is contained in:
Alex Kotov 2020-11-25 15:44:36 +05:00
parent 93d472f866
commit 4e9b88d428
Signed by: kotovalexarian
GPG key ID: 553C0EBBEB5D5F08
1 changed files with 25 additions and 1 deletions
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26
kernelmq/init.c
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@ -9,6 +9,7 @@
#include "tasks.h"
#include "elf.h"
#include "logger.h"
static struct KernelMQ_Info kinfo;
@ -31,6 +32,29 @@ void init(const struct KernelMQ_Info *const kinfo_ptr)
paging_load();
if (kinfo.modules_count > 0) {
tasks_switch_to_user(kinfo.modules[0].base);
const struct KernelMQ_ELF_Header *const elf_header =
(void*)kinfo.modules[0].base;
const unsigned char is_elf_header_valid =
elf_header->magic_0x7F == 0x7F &&
elf_header->magic_E == 'E' &&
elf_header->magic_L == 'L' &&
elf_header->magic_F == 'F' &&
elf_header->bitness == 1 &&
elf_header->endianness == 1 &&
elf_header->header_version == 1 &&
elf_header->os_abi == 0 &&
elf_header->obj_type == 2 &&
elf_header->isa == 3 &&
elf_header->elf_version == 1 &&
elf_header->arch_flags == 0 &&
elf_header->header_size == 52;
if (is_elf_header_valid) {
tasks_switch_to_user(elf_header->entrypoint);
}
else {
logger_warn_from("init", "Invalid ELF header");
}
}
}