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llvm-profdata: Avoid undefined behaviour when reading raw profiles

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The raw profiles that are generated in compiler-rt always add padding
so that each profile is aligned, so we can simply treat files that
don't have this property as malformed.

Caught by Alexey's new ubsan bot. Thanks!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217708 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Justin Bogner
2014-09-12 21:22:55 +00:00
parent 206359ba20
commit 824444e97a
2 changed files with 3 additions and 2 deletions
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3
lib/ProfileData/InstrProfReader.cpp
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@@ -190,6 +190,9 @@ RawInstrProfReader<IntPtrT>::readNextHeader(const char *CurrentPos) {
// garbage at the end of the file.
if (CurrentPos + sizeof(RawHeader) > End)
return instrprof_error::malformed;
// The writer ensures each profile is padded to start at an aligned address.
if (reinterpret_cast<size_t>(CurrentPos) % alignOf<uint64_t>())
return instrprof_error::malformed;
// The magic should have the same byte order as in the previous header.
uint64_t Magic = *reinterpret_cast<const uint64_t *>(CurrentPos);
if (Magic != swap(getRawMagic<IntPtrT>()))