https://bugs.llvm.org/show_bug.cgi?id=45295
Bug ID: 45295
Summary: Provide a way to declare the *SAN exception handler
-fsanitize-undefined-trap-on-error
Product: compiler-rt
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: ubsan
Assignee: unassignedb...@nondot.org
Reporter: keesc...@chromium.org
CC: llvm-bugs@lists.llvm.org
Instead of unconditionally calling __builtin_trap() for
-fsanitize-undefined-trap-on-error it would help the Linux kernel's use of
UBSAN to have a way to specify the trap function. With that, Linux can use its
own internal exception handling routines and avoid various confused states:
https://lore.kernel.org/linux-next/20200324164433.qusyu5h7ykx3f2bu@treble/
For example something like -fsanitize-undefined-trap-function=__ubsan_trap and
"__ubsan_trap" can then be defined by the kernel itself. Using the standard
handler routines (__ubsan_handle_*) are too heavy duty for some builds, so a
regular trap is needed for the kernel, but this allows us to provide a
"continue anyway" option as well.
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