mirror of
https://git.in.rschanz.org/ryan77627/guix.git
synced 2024-11-19 21:27:37 -05:00
a14de83213
* gnu/packages/patches/upx-protect-against-bad-crafted-input.patch: New file. * gnu/packages/compression.scm (upx)[source]: Use it. * gnu/local.mk (dist_patch_DATA): Add it. Signed-off-by: Ludovic Courtès <ludo@gnu.org>
96 lines
3.6 KiB
Diff
96 lines
3.6 KiB
Diff
From 3e0c2966dffb5dadb512a476ef4be3d0cc51c2be Mon Sep 17 00:00:00 2001
|
|
From: Pierre Neidhardt <ambrevar@gmail.com>
|
|
Date: Sat, 16 Jun 2018 16:35:00 +0200
|
|
Subject: [PATCH] Protect against bad crafted input
|
|
|
|
Also check for wrap-around when checking oversize involving e_shoff and e_shnum.
|
|
|
|
raised by https://github.com/upx/upx/pull/190
|
|
modified: p_lx_elf.cpp
|
|
---
|
|
src/p_lx_elf.cpp | 30 ++++++++++++++++++++++++++++++
|
|
1 file changed, 30 insertions(+)
|
|
|
|
diff --git a/src/p_lx_elf.cpp b/src/p_lx_elf.cpp
|
|
index 822a7652..41e805ee 100644
|
|
--- a/src/p_lx_elf.cpp
|
|
+++ b/src/p_lx_elf.cpp
|
|
@@ -235,8 +235,17 @@ PackLinuxElf32::PackLinuxElf32help1(InputFile *f)
|
|
sz_phdrs = 0;
|
|
return;
|
|
}
|
|
+ if (0==e_phnum) throwCantUnpack("0==e_phnum");
|
|
e_phoff = get_te32(&ehdri.e_phoff);
|
|
+ unsigned const last_Phdr = e_phoff + e_phnum * sizeof(Elf32_Phdr);
|
|
+ if (last_Phdr < e_phoff || (unsigned long)file_size < last_Phdr) {
|
|
+ throwCantUnpack("bad e_phoff");
|
|
+ }
|
|
e_shoff = get_te32(&ehdri.e_shoff);
|
|
+ unsigned const last_Shdr = e_shoff + e_shnum * sizeof(Elf32_Shdr);
|
|
+ if (last_Shdr < e_shoff || (unsigned long)file_size < last_Shdr) {
|
|
+ throwCantUnpack("bad e_shoff");
|
|
+ }
|
|
sz_phdrs = e_phnum * e_phentsize;
|
|
|
|
if (f && Elf32_Ehdr::ET_DYN!=e_type) {
|
|
@@ -599,8 +608,17 @@ PackLinuxElf64::PackLinuxElf64help1(InputFile *f)
|
|
sz_phdrs = 0;
|
|
return;
|
|
}
|
|
+ if (0==e_phnum) throwCantUnpack("0==e_phnum");
|
|
e_phoff = get_te64(&ehdri.e_phoff);
|
|
+ upx_uint64_t const last_Phdr = e_phoff + e_phnum * sizeof(Elf64_Phdr);
|
|
+ if (last_Phdr < e_phoff || (unsigned long)file_size < last_Phdr) {
|
|
+ throwCantUnpack("bad e_phoff");
|
|
+ }
|
|
e_shoff = get_te64(&ehdri.e_shoff);
|
|
+ upx_uint64_t const last_Shdr = e_shoff + e_shnum * sizeof(Elf64_Shdr);
|
|
+ if (last_Shdr < e_shoff || (unsigned long)file_size < last_Shdr) {
|
|
+ throwCantUnpack("bad e_shoff");
|
|
+ }
|
|
sz_phdrs = e_phnum * e_phentsize;
|
|
|
|
if (f && Elf64_Ehdr::ET_DYN!=e_type) {
|
|
@@ -3763,6 +3781,9 @@ void PackLinuxElf64::pack4(OutputFile *fo, Filter &ft)
|
|
|
|
void PackLinuxElf64::unpack(OutputFile *fo)
|
|
{
|
|
+ if (e_phoff != sizeof(Elf64_Ehdr)) {// Phdrs not contiguous with Ehdr
|
|
+ throwCantUnpack("bad e_phoff");
|
|
+ }
|
|
unsigned const c_phnum = get_te16(&ehdri.e_phnum);
|
|
upx_uint64_t old_data_off = 0;
|
|
upx_uint64_t old_data_len = 0;
|
|
@@ -3828,6 +3849,9 @@ void PackLinuxElf64::unpack(OutputFile *fo)
|
|
unsigned total_out = 0;
|
|
unsigned c_adler = upx_adler32(NULL, 0);
|
|
unsigned u_adler = upx_adler32(NULL, 0);
|
|
+ if ((MAX_ELF_HDR - sizeof(Elf64_Ehdr))/sizeof(Elf64_Phdr) < u_phnum) {
|
|
+ throwCantUnpack("bad compressed e_phnum");
|
|
+ }
|
|
|
|
// Packed ET_EXE has no PT_DYNAMIC.
|
|
// Packed ET_DYN has original PT_DYNAMIC for info needed by rtld.
|
|
@@ -4383,6 +4407,9 @@ Elf64_Sym const *PackLinuxElf64::elf_lookup(char const *name) const
|
|
|
|
void PackLinuxElf32::unpack(OutputFile *fo)
|
|
{
|
|
+ if (e_phoff != sizeof(Elf32_Ehdr)) {// Phdrs not contiguous with Ehdr
|
|
+ throwCantUnpack("bad e_phoff");
|
|
+ }
|
|
unsigned const c_phnum = get_te16(&ehdri.e_phnum);
|
|
unsigned old_data_off = 0;
|
|
unsigned old_data_len = 0;
|
|
@@ -4449,6 +4476,9 @@ void PackLinuxElf32::unpack(OutputFile *fo)
|
|
unsigned total_out = 0;
|
|
unsigned c_adler = upx_adler32(NULL, 0);
|
|
unsigned u_adler = upx_adler32(NULL, 0);
|
|
+ if ((MAX_ELF_HDR - sizeof(Elf32_Ehdr))/sizeof(Elf32_Phdr) < u_phnum) {
|
|
+ throwCantUnpack("bad compressed e_phnum");
|
|
+ }
|
|
|
|
// Packed ET_EXE has no PT_DYNAMIC.
|
|
// Packed ET_DYN has original PT_DYNAMIC for info needed by rtld.
|
|
--
|
|
2.17.0
|
|
|