public-mirrors/linux
1
0
Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-08-05 16:54:27 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

init.h: Disable sanitizer coverage for __init and __head

Browse source 
While __noinstr already contained __no_sanitize_coverage, it needs to
be added to __init and __head section markings to support the Clang
implementation of CONFIG_KSTACK_ERASE. This is to make sure the stack
depth tracking callback is not executed in unsupported contexts.

The other sanitizer coverage options (trace-pc and trace-cmp) aren't
needed in __head nor __init either ("We are interested in code coverage
as a function of a syscall inputs"[1]), so this is fine to disable for
them as well.

Link: https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/kernel/kcov.c?h=v6.14#n179 [1]
Acked-by: Marco Elver <elver@google.com>
Link: https://lore.kernel.org/r/20250724055029.3623499-3-kees@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Kees Cook 2025-07-23 22:50:27 -07:00
parent 431a380f93
commit 381a38ea53
2 changed files with 4 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
arch/x86/include/asm/init.h
View file

@ -5,7 +5,7 @@
#if defined(CONFIG_CC_IS_CLANG) && CONFIG_CLANG_VERSION < 170000
#define __head __section(".head.text") __no_sanitize_undefined __no_stack_protector
#else
#define __head __section(".head.text") __no_sanitize_undefined
#define __head __section(".head.text") __no_sanitize_undefined __no_sanitize_coverage
#endif
struct x86_mapping_info {

4
include/linux/init.h
View file

@ -49,7 +49,9 @@
/* These are for everybody (although not all archs will actually
discard it in modules) */
#define __init __section(".init.text") __cold __latent_entropy __noinitretpoline
#define __init __section(".init.text") __cold __latent_entropy \
__noinitretpoline \
__no_sanitize_coverage
#define __initdata __section(".init.data")
#define __initconst __section(".init.rodata")
#define __exitdata __section(".exit.data")