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Bug 1456054: Verify that a redirected address is accessible and backed by an image; r=handyman

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This commit is contained in:
Aaron Klotz 2018-04-23 15:07:54 -06:00
parent 7331bdb85a
commit ea4048c1e7
2 changed files with 21 additions and 9 deletions
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4
mozglue/misc/interceptor/MMPolicies.h
View File

@ -139,8 +139,8 @@ public:
MEMORY_BASIC_INFORMATION mbi;
SIZE_T result = ::VirtualQuery(aVAddress, &mbi, sizeof(mbi));
return result && mbi.AllocationProtect && mbi.State == MEM_COMMIT &&
mbi.Protect != PAGE_NOACCESS;
return result && mbi.AllocationProtect && (mbi.Type & MEM_IMAGE) &&
mbi.State == MEM_COMMIT && mbi.Protect != PAGE_NOACCESS;
}
bool FlushInstructionCache() const

26
mozglue/misc/interceptor/PatcherBase.h
View File

@ -45,35 +45,47 @@ protected:
}
}
origFn += 2 + offset;
return ReadOnlyTargetFunction<MMPolicyT>(mVMPolicy, origFn.GetAddress());
uintptr_t abstarget = (origFn + 2 + offset).GetAddress();
return EnsureTargetIsAccessible(Move(origFn), abstarget);
}
#if defined(_M_IX86)
// If function entry is jmp [disp32] such as used by kernel32,
// we resolve redirected address from import table.
if (origFn[0] == 0xff && origFn[1] == 0x25) {
return ReadOnlyTargetFunction<MMPolicyT>(mVMPolicy,
reinterpret_cast<const void*>((origFn + 2).template ChasePointer<uintptr_t*>()));
uintptr_t abstarget = (origFn + 2).template ChasePointer<uintptr_t*>();
return EnsureTargetIsAccessible(Move(origFn), abstarget);
}
#elif defined(_M_X64)
// If function entry is jmp [disp32] such as used by kernel32,
// we resolve redirected address from import table.
if (origFn[0] == 0x48 && origFn[1] == 0xff && origFn[2] == 0x25) {
return ReadOnlyTargetFunction<MMPolicyT>(mVMPolicy,
reinterpret_cast<const void*>((origFn + 3).ChasePointerFromDisp()));
uintptr_t abstarget = (origFn + 3).ChasePointerFromDisp();
return EnsureTargetIsAccessible(Move(origFn), abstarget);
}
if (origFn[0] == 0xe9) {
// require for TestDllInterceptor with --disable-optimize
uintptr_t abstarget = (origFn + 1).ReadDisp32AsAbsolute();
return ReadOnlyTargetFunction<MMPolicyT>(mVMPolicy, abstarget);
return EnsureTargetIsAccessible(Move(origFn), abstarget);
}
#endif
return Move(origFn);
}
private:
ReadOnlyTargetFunction<MMPolicyT>
EnsureTargetIsAccessible(ReadOnlyTargetFunction<MMPolicyT> aOrigFn,
uintptr_t aRedirAddress)
{
if (!mVMPolicy.IsPageAccessible(reinterpret_cast<void*>(aRedirAddress))) {
return Move(aOrigFn);
}
return ReadOnlyTargetFunction<MMPolicyT>(mVMPolicy, aRedirAddress);
}
protected:
VMPolicy mVMPolicy;
};