44ad67031c
This eagerly reports use of undef values when passed to noundef parameters or returned from noundef functions. This also decreases binary sizes under msan. To go back to the previous behavior, pass `-fno-sanitize-memory-param-retval`. Reviewed By: vitalybuka, MaskRay Differential Revision: https://reviews.llvm.org/D134669
37 lines
1.7 KiB
C
37 lines
1.7 KiB
C
// RUN: %clang_cc1 -triple x86_64-linux-gnu -S -emit-llvm -O2 -fsanitize=kernel-memory -no-enable-noundef-analysis -o - %s | \
|
|
// RUN: FileCheck %s --check-prefix=CLEAN
|
|
// RUN: %clang_cc1 -triple x86_64-linux-gnu -S -emit-llvm -O2 -fsanitize=kernel-memory -fno-sanitize-memory-param-retval -o - %s | \
|
|
// RUN: FileCheck %s --check-prefixes=NOUNDEF,NOUNDEF_ONLY
|
|
// RUN: %clang_cc1 -triple x86_64-linux-gnu -S -emit-llvm -O2 -fsanitize=kernel-memory -mllvm -msan-eager-checks -o - %s | \
|
|
// RUN: FileCheck %s --check-prefixes=NOUNDEF,EAGER
|
|
// RUN: %clang_cc1 -triple x86_64-linux-gnu -S -emit-llvm -O2 -fsanitize=kernel-memory -no-enable-noundef-analysis -fsanitize-memory-param-retval -o - %s | \
|
|
// RUN: FileCheck %s --check-prefixes=CLEAN
|
|
// RUN: %clang_cc1 -triple x86_64-linux-gnu -S -emit-llvm -O2 -fsanitize=kernel-memory -o - %s | \
|
|
// RUN: FileCheck %s --check-prefixes=NOUNDEF,EAGER
|
|
|
|
void foo();
|
|
|
|
void bar(int x) {
|
|
if (x)
|
|
foo();
|
|
}
|
|
|
|
|
|
// CLEAN: define dso_local void @bar(i32 %x)
|
|
// NOUNDEF: define dso_local void @bar(i32 noundef %x)
|
|
//
|
|
// %param_shadow assignment gets optimized away with -O2, because it is at the beginning of the
|
|
// struct returned by __msan_get_context_state(). Use %param_origin as a sign that the shadow of
|
|
// the first argument is being used.
|
|
//
|
|
// Without noundef analysis, KMSAN emits metadata checks for the function parameter.
|
|
// CLEAN: load i32, ptr %param_origin
|
|
//
|
|
// With noundef analysis enabled, but without eager checks, KMSAN still emits metadata checks,
|
|
// although the parameter is known to be defined.
|
|
// NOUNDEF_ONLY: load i32, ptr %param_origin
|
|
//
|
|
// With noundef analysis and eager checks enabled, KMSAN won't emit metadata checks for function
|
|
// parameters.
|
|
// EAGER-NOT: load i32, ptr %param_origin
|