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// SPDX-License-Identifier: GPL-2.0
/*
* An indirect call, which under kCFI is preceded by a type check and a trap.
*
* Clang emits a __cfi_<func> prefix symbol carrying the type hash ahead of
* every address-taken function, and records the trap site in .kcfi_traps.
* Both belong to the function and both have to come with it into a patch.
*
* Needs -fsanitize=kcfi, which only Clang has.
*/
static const char __modinfo[]
__attribute__((section(".modinfo"), used, aligned(1))) = "\0name=vmlinux";
static int impl_a(int x)
{
return x + 1;
}
static int impl_b(int x)
{
return x * 2;
}
__attribute__((noinline)) int (*pick(int x))(int)
{
return (x & 1) ? impl_a : impl_b;
}
int target(int x)
{
int (*fn)(int arg) = pick(x);
#ifdef PATCHED
return fn(x) + 2;
#else
return fn(x) + 1;
#endif
}
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