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Unpack: Phdrs must be within expansion of first compressed block

Browse Source 
https://github.com/upx/upx/issues/388
	modified:   p_lx_elf.cpp
This commit is contained in:
John Reiser
2020-07-22 19:34:27 -07:00
committed by Markus F.X.J. Oberhumer
parent 527139978a
commit 0016512df1
1 changed files with 2 additions and 2 deletions
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4
src/p_lx_elf.cpp
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@@ -4550,7 +4550,7 @@ void PackLinuxElf64::unpack(OutputFile *fo)
unsigned c_adler = upx_adler32(NULL, 0);
unsigned u_adler = upx_adler32(NULL, 0);
#define MAX_ELF_HDR 1024
if ((MAX_ELF_HDR - sizeof(Elf64_Ehdr))/sizeof(Elf64_Phdr) < u_phnum) {
if ((umin64(MAX_ELF_HDR, ph.u_len) - sizeof(Elf64_Ehdr))/sizeof(Elf64_Phdr) < u_phnum) {
throwCantUnpack("bad compressed e_phnum");
}
#undef MAX_ELF_HDR
@@ -5617,7 +5617,7 @@ void PackLinuxElf32::unpack(OutputFile *fo)
unsigned c_adler = upx_adler32(NULL, 0);
unsigned u_adler = upx_adler32(NULL, 0);
#define MAX_ELF_HDR 512
if ((MAX_ELF_HDR - sizeof(Elf32_Ehdr))/sizeof(Elf32_Phdr) < u_phnum) {
if ((umin(MAX_ELF_HDR, ph.u_len) - sizeof(Elf32_Ehdr))/sizeof(Elf32_Phdr) < u_phnum) {
throwCantUnpack("bad compressed e_phnum");
}
#undef MAX_ELF_HDR