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Unpack 8-byte b_info only if (ph.version <= 11): 2001 or earlier

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*x86 only: .e_entry too low
https://github.com/upx/upx/issues/774
	modified:   p_lx_elf.cpp
This commit is contained in:
John Reiser 2024-01-25 09:06:46 -08:00 committed by Markus F.X.J. Oberhumer
parent 5d649f83ec
commit 10807ebdc2
1 changed files with 8 additions and 2 deletions
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10
src/p_lx_elf.cpp
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@ -7170,7 +7170,10 @@ void PackLinuxElf64::unpack(OutputFile *fo)
upx_uint64_t old_dtinit = 0;
if (Elf64_Ehdr::ET_EXEC == get_te16(&ehdri.e_type)) {
if (get_te64(&ehdri.e_entry) < 0x401180
// 40fddf17153ee3db73a04ff1bf288b91676138d6 2001-02-01 ph.version 11; b_info 12 bytes
// df9db96bd1c013c07da1d7ec740021d588ab2815 2001-01-17 ph.version 11; no b_info (==> 8 bytes)
if (ph.version <= 11
&& get_te64(&ehdri.e_entry) < 0x401180
&& get_te16(&ehdri.e_machine)==Elf64_Ehdr::EM_X86_64) {
// old style, 8-byte b_info:
// sizeof(b_info.sz_unc) + sizeof(b_info.sz_cpr);
@ -8338,7 +8341,10 @@ void PackLinuxElf32::unpack(OutputFile *fo)
upx_uint32_t old_dtinit = 0;
if (Elf32_Ehdr::ET_EXEC == get_te16(&ehdri.e_type)) {
if (get_te32(&ehdri.e_entry) < 0x401180
// 40fddf17153ee3db73a04ff1bf288b91676138d6 2001-02-01 ph.version 11; b_info 12 bytes
// df9db96bd1c013c07da1d7ec740021d588ab2815 2001-01-17 ph.version 11; no b_info (==> 8 bytes)
if (ph.version <= 11
&& get_te32(&ehdri.e_entry) < 0x401180
&& get_te16(&ehdri.e_machine)==Elf32_Ehdr::EM_386) {
// old style, 8-byte b_info:
// sizeof(b_info.sz_unc) + sizeof(b_info.sz_cpr);