https://bugs.llvm.org/show_bug.cgi?id=48677
Bug ID: 48677
Summary: [asan][win] Interceptor failures on Windows Insider
builds
Product: compiler-rt
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: asan
Assignee: unassignedb...@nondot.org
Reporter: dma...@mozilla.com
CC: h...@chromium.org, llvm-bugs@lists.llvm.org,
nicolaswe...@gmx.de, r...@google.com
In newer Windows Insider builds (20277 to 20231 at least), various system
functions are no longer preceded by sufficient `int 3` padding to insert a
hotpatch.
This leads to two problems:
1. ASan falls back to using trampolines, which means it needs to scan through
more instructions than before, so it starts seeing encodings that
`GetInstructionSize()` doesn't know about.
That's easy enough to fix, but then...
2. The increased length of trampolines means a higher risk of clobbering a
branch target. In particular, a later part of `ntdll!strrchr` contains a jump
back to the +3 offset, which is now garbage.
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