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contrib/elf2dmp: add ELF dump header checking 

Add ELF header checking to prevent processing input file which is not
QEMU x86_64 guest memory dump or even not ELF.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1013

Signed-off-by: Viktor Prutyanov <viktor.prutyanov@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220520084339.171684-1-viktor.prutyanov@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Viktor Prutyanov 2022-05-20 11:43:39 +03:00 committed by Paolo Bonzini
parent 232e925547
commit c06ebc0f1b
1 changed files with 53 additions and 0 deletions
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53
contrib/elf2dmp/qemu_elf.c
View File

@ -118,6 +118,53 @@ static void exit_states(QEMU_Elf *qe)
free(qe->state); free(qe->state);
} }
static bool check_ehdr(QEMU_Elf *qe)
{
Elf64_Ehdr *ehdr = qe->map;
if (sizeof(Elf64_Ehdr) > qe->size) {
eprintf("Invalid input dump file size\n");
return false;
}
if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG)) {
eprintf("Invalid ELF signature, input file is not ELF\n");
return false;
}
if (ehdr->e_ident[EI_CLASS] != ELFCLASS64 ||
ehdr->e_ident[EI_DATA] != ELFDATA2LSB) {
eprintf("Invalid ELF class or byte order, must be 64-bit LE\n");
return false;
}
if (ehdr->e_ident[EI_VERSION] != EV_CURRENT) {
eprintf("Invalid ELF version\n");
return false;
}
if (ehdr->e_machine != EM_X86_64) {
eprintf("Invalid input dump architecture, only x86_64 is supported\n");
return false;
}
if (ehdr->e_type != ET_CORE) {
eprintf("Invalid ELF type, must be core file\n");
return false;
}
/*
* ELF dump file must contain one PT_NOTE and at least one PT_LOAD to
* restore physical address space.
*/
if (ehdr->e_phnum < 2) {
eprintf("Invalid number of ELF program headers\n");
return false;
}
return true;
}
int QEMU_Elf_init(QEMU_Elf *qe, const char *filename) int QEMU_Elf_init(QEMU_Elf *qe, const char *filename)
{ {
GError *gerr = NULL; GError *gerr = NULL;
@ -133,6 +180,12 @@ int QEMU_Elf_init(QEMU_Elf *qe, const char *filename)
qe->map = g_mapped_file_get_contents(qe->gmf); qe->map = g_mapped_file_get_contents(qe->gmf);
qe->size = g_mapped_file_get_length(qe->gmf); qe->size = g_mapped_file_get_length(qe->gmf);
if (!check_ehdr(qe)) {
eprintf("Input file has the wrong format\n");
err = 1;
goto out_unmap;
}
if (init_states(qe)) { if (init_states(qe)) {
eprintf("Failed to extract QEMU CPU states\n"); eprintf("Failed to extract QEMU CPU states\n");
err = 1; err = 1;