linux

iv/linux

History

Peter Zijlstra 69d4c0d321 entry, kasan, x86: Disallow overriding mem*() functions

KASAN cannot just hijack the mem*() functions, it needs to emit
__asan_mem*() variants if it wants instrumentation (other sanitizers
already do this).

  vmlinux.o: warning: objtool: sync_regs+0x24: call to memcpy() leaves .noinstr.text section
  vmlinux.o: warning: objtool: vc_switch_off_ist+0xbe: call to memcpy() leaves .noinstr.text section
  vmlinux.o: warning: objtool: fixup_bad_iret+0x36: call to memset() leaves .noinstr.text section
  vmlinux.o: warning: objtool: __sev_get_ghcb+0xa0: call to memcpy() leaves .noinstr.text section
  vmlinux.o: warning: objtool: __sev_put_ghcb+0x35: call to memcpy() leaves .noinstr.text section

Remove the weak aliases to ensure nobody hijacks these functions and
add them to the noinstr section.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Tested-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/r/20230112195542.028523143@infradead.org

2023-01-13 11:48:17 +01:00

common.c

stackdepot: reserve 5 extra bits in depot_stack_handle_t

2022-10-03 14:03:18 -07:00

generic.c

mm: kasan: Extend kasan_metadata_size() to also cover in-object size

2022-11-10 16:27:46 +01:00

hw_tags.c

kasan: support kasan.stacktrace for SW_TAGS

2022-10-03 14:03:01 -07:00

init.c

kasan: use MAX_PTRS_PER_* for early shadow tables