diff options
Diffstat (limited to 'gnu/packages/patches/upx-fix-CVE-2017-15056.patch')
| -rw-r--r-- | gnu/packages/patches/upx-fix-CVE-2017-15056.patch | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/gnu/packages/patches/upx-fix-CVE-2017-15056.patch b/gnu/packages/patches/upx-fix-CVE-2017-15056.patch new file mode 100644 index 0000000000..525980e73e --- /dev/null +++ b/gnu/packages/patches/upx-fix-CVE-2017-15056.patch @@ -0,0 +1,96 @@ +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 + |