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[Object/ELF] - Do not allow overflow when checking section size/offset.

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Overflow was the reason of incorrect passing the check,
patch fixes the case.

Differentail revision: https://reviews.llvm.org/D25514

llvm-svn: 285284
This commit is contained in:
George Rimar 2016-10-27 11:44:56 +00:00
parent f764591abe
commit 9ee5fd9330
3 changed files with 6 additions and 1 deletions
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3
include/llvm/Object/ELF.h
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@ -229,7 +229,8 @@ ELFFile<ELFT>::getSectionContentsAsArray(const Elf_Shdr *Sec) const {
if (Size % sizeof(T))
return object_error::parse_failed;
if (Offset + Size > Buf.size())
if ((std::numeric_limits<uintX_t>::max() - Offset < Size) ||
Offset + Size > Buf.size())
return object_error::parse_failed;
const T *Start = reinterpret_cast<const T *>(base() + Offset);

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test/Object/Inputs/invalid-section-size2.elf Normal file
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4
test/Object/invalid.test
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@ -72,3 +72,7 @@ INVALID-RELOC-SH-OFFSET: Invalid data was encountered while parsing the file
RUN: not llvm-readobj -t %p/Inputs/invalid-sections-address-alignment.x86-64 2>&1 | \
RUN: FileCheck --check-prefix=INVALID-SEC-ADDRESS-ALIGNMENT %s
INVALID-SEC-ADDRESS-ALIGNMENT: Invalid data was encountered while parsing the file
RUN: not llvm-readobj -t %p/Inputs/invalid-section-size2.elf 2>&1 | \
RUN: FileCheck --check-prefix=INVALID-SECTION-SIZE2 %s
INVALID-SECTION-SIZE2: Invalid data was encountered while parsing the file.