[PATCH] D13670: [sanitizer] Fix ptrace interceptor for aarch64

[Adhemerval Zanella via llvm-commits]

zatrazz created this revision.
zatrazz added reviewers: kcc, pcc, rengolin, eugenis, samsonov.
zatrazz added a subscriber: llvm-commits.
Herald added subscribers: rengolin, aemerson.

This patch fixes the ptrace interceptor for aarch64. The PTRACE_GETREGSET
ptrace syscall with with invalid memory might zero the iovec::iov_base
field and then masking the subsequent check after the syscall (since it
will be 0 and it will not trigger an invalid access). The fix is to copy
the value on a local variable and use its value on the check.

The patch also adds more coverage on the Linux/ptrace.cc testcase by addding
check for PTRACE_GETREGSET for both general and floating registers (aarch64
definitions added only).

http://reviews.llvm.org/D13670

Files:
  lib/sanitizer_common/sanitizer_common_interceptors.inc
  test/asan/TestCases/Linux/ptrace.cc

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