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Next set of additional error checks for invalid Mach-O files for the

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load command that uses the Mach::rpath_command type
but not used in llvm libObject code but used in llvm tool code.

This includes just the LC_RPATH load command.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282649 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kevin Enderby 2016-09-28 23:16:01 +00:00
parent 1deea86d16
commit dda50f2d84
5 changed files with 41 additions and 0 deletions
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32
lib/Object/MachOObjectFile.cpp
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@ -669,6 +669,35 @@ static Error checkVersCommand(const MachOObjectFile *Obj,
return Error::success();
}
static Error checkRpathCommand(const MachOObjectFile *Obj,
const MachOObjectFile::LoadCommandInfo &Load,
uint32_t LoadCommandIndex) {
if (Load.C.cmdsize < sizeof(MachO::rpath_command))
return malformedError("load command " + Twine(LoadCommandIndex) +
" LC_RPATH cmdsize too small");
MachO::rpath_command R = getStruct<MachO::rpath_command>(Obj, Load.Ptr);
if (R.path < sizeof(MachO::rpath_command))
return malformedError("load command " + Twine(LoadCommandIndex) +
" LC_RPATH path.offset field too small, not past "
"the end of the rpath_command struct");
if (R.path >= R.cmdsize)
return malformedError("load command " + Twine(LoadCommandIndex) +
" LC_RPATH path.offset field extends past the end "
"of the load command");
// Make sure there is a null between the starting offset of the path and
// the end of the load command.
uint32_t i;
const char *P = (const char *)Load.Ptr;
for (i = R.path; i < R.cmdsize; i++)
if (P[i] == '\0')
break;
if (i >= R.cmdsize)
return malformedError("load command " + Twine(LoadCommandIndex) +
" LC_RPATH library name extends past the end of the "
"load command");
return Error::success();
}
Expected<std::unique_ptr<MachOObjectFile>>
MachOObjectFile::create(MemoryBufferRef Object, bool IsLittleEndian,
bool Is64Bits) {
@ -847,6 +876,9 @@ MachOObjectFile::MachOObjectFile(MemoryBufferRef Object, bool IsLittleEndian,
if ((Err = checkVersCommand(this, Load, I, &VersLoadCmd,
"LC_VERSION_MIN_WATCHOS")))
return;
} else if (Load.C.cmd == MachO::LC_RPATH) {
if ((Err = checkRpathCommand(this, Load, I)))
return;
}
if (I < LoadCommandCount - 1) {
if (auto LoadOrErr = getNextLoadCommandInfo(this, I, Load))

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9
test/Object/macho-invalid.test
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@ -313,3 +313,12 @@ INVALID-VERS-SMALL: macho-invalid-vers-small': truncated or malformed object (lo
RUN: not llvm-objdump -macho -private-headers %p/Inputs/macho-invalid-vers-more-than-one 2>&1 | FileCheck -check-prefix INVALID-VERS-MORE-THAN-ONE %s
INVALID-VERS-MORE-THAN-ONE: macho-invalid-vers-more-than-one': truncated or malformed object (more than one LC_VERSION_MIN_MACOSX, LC_VERSION_MIN_IPHONEOS, LC_VERSION_MIN_TVOS or LC_VERSION_MIN_WATCHOS command)
RUN: not llvm-objdump -macho -private-headers %p/Inputs/macho-invalid-rpath-small 2>&1 | FileCheck -check-prefix INVALID-RPATH-SMALL %s
INVALID-RPATH-SMALL: macho-invalid-rpath-small': truncated or malformed object (load command 0 LC_RPATH cmdsize too small)
RUN: not llvm-objdump -macho -private-headers %p/Inputs/macho-invalid-rpath-name_offset-toobig 2>&1 | FileCheck -check-prefix INVALID-RPATH-NAME_OFFSET-TOOBIG %s
INVALID-RPATH-NAME_OFFSET-TOOBIG: macho-invalid-rpath-name_offset-toobig': truncated or malformed object (load command 0 LC_RPATH path.offset field extends past the end of the load command)
RUN: not llvm-objdump -macho -private-headers %p/Inputs/macho-invalid-rpath-name_toobig 2>&1 | FileCheck -check-prefix INVALID-RPATH-NAME_TOOBIG %s
INVALID-RPATH-NAME_TOOBIG: macho-invalid-rpath-name_toobig': truncated or malformed object (load command 0 LC_RPATH library name extends past the end of the load command)