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compiler_types: add Endianness-dependent __counted_by_{le,be}

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Some structures contain flexible arrays at the end and the counter for
them, but the counter has explicit Endianness and thus __counted_by()
can't be used directly.

To increase test coverage for potential problems without breaking
anything, introduce __counted_by_{le,be}() defined depending on
platform's Endianness to either __counted_by() when applicable or noop
otherwise.
Maybe it would be a good idea to introduce such attributes on compiler
level if possible, but for now let's stop on what we have.

Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Link: https://lore.kernel.org/r/20240327142241.1745989-2-aleksander.lobakin@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Alexander Lobakin 2024-03-27 15:22:39 +01:00 committed by Jakub Kicinski
parent 6e9b01909a
commit ca7e324e8a
3 changed files with 14 additions and 0 deletions
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2
Documentation/conf.py
View file

@ -75,6 +75,8 @@ if major >= 3:
"__rcu",
"__user",
"__force",
"__counted_by_le",
"__counted_by_be",
# include/linux/compiler_attributes.h:
"__alias",

11
include/linux/compiler_types.h
View file

@ -282,6 +282,17 @@ struct ftrace_likely_data {
#define __no_sanitize_or_inline __always_inline
#endif
/*
* Apply __counted_by() when the Endianness matches to increase test coverage.
*/
#ifdef __LITTLE_ENDIAN
#define __counted_by_le(member) __counted_by(member)
#define __counted_by_be(member)
#else
#define __counted_by_le(member)
#define __counted_by_be(member) __counted_by(member)
#endif
/* Do not trap wrapping arithmetic within an annotated function. */
#ifdef CONFIG_UBSAN_SIGNED_WRAP
# define __signed_wrap __attribute__((no_sanitize("signed-integer-overflow")))

1
scripts/kernel-doc
View file

@ -1143,6 +1143,7 @@ sub dump_struct($$) {
$members =~ s/\s*$attribute/ /gi;
$members =~ s/\s*__aligned\s*\([^;]*\)/ /gos;
$members =~ s/\s*__counted_by\s*\([^;]*\)/ /gos;
$members =~ s/\s*__counted_by_(le|be)\s*\([^;]*\)/ /gos;
$members =~ s/\s*__packed\s*/ /gos;
$members =~ s/\s*CRYPTO_MINALIGN_ATTR/ /gos;
$members =~ s/\s*____cacheline_aligned_in_smp/ /gos;