https://llvm.org/bugs/show_bug.cgi?id=26033
Bug ID: 26033
Summary: The correct implementation of __cfi_slowpath
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: hjl.to...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
ControlFlowIntegrityDesign.rst has
CFI_SlowPath
------------
The slow path check is implemented in compiler-rt library as
.. code-block:: none
void __cfi_slowpath(uint64 CallSiteTypeId, void *TargetAddr)
This functions loads a shadow value for ``TargetAddr``, finds the
address of __cfi_check as described above and calls that.
However __cfi_slowpath is implemented as
xtern "C" SANITIZER_INTERFACE_ATTRIBUTE
void __cfi_slowpath(uptr CallSiteTypeId, void *Ptr) {
uptr Addr = (uptr)Ptr;
VReport(3, "__cfi_slowpath: %zx, %p\n", CallSiteTypeId, Ptr);
ShadowValue sv = ShadowValue::load(Addr);
if (sv.is_invalid()) {
VReport(2, "CFI: invalid memory region for a function pointer (shadow==0):
%p\n", Ptr);
Die();
}
uptr != uint64 for 32-bit target.
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