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randstruct: Force full rebuild when seed changes

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While the randstruct GCC plugin was being rebuilt if the randstruct seed
changed, Clang builds did not notice the change. This could result in
differing struct layouts in a target depending on when it was built.

Include the existing generated header file in compiler-version.h when
its associated feature name, RANDSTRUCT, is defined. This will be picked
up by fixdep and force rebuilds where needed.

Link: https://lore.kernel.org/r/20250503184623.2572355-2-kees@kernel.org
Reviewed-by: Nicolas Schier <n.schier@avm.de>
Tested-by: Nicolas Schier <n.schier@avm.de>
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Kees Cook 2025-05-03 11:46:19 -07:00
parent 0cecd37dae
commit 056000c471
2 changed files with 9 additions and 1 deletions
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9
include/linux/compiler-version.h
View file

@ -23,3 +23,12 @@
#ifdef GCC_PLUGINS
#include <generated/gcc-plugins.h>
#endif
/*
* If the randstruct seed itself changes (whether for GCC plugins or
* Clang), the entire tree needs to be rebuilt since the randomization of
* structures may change between compilation units if not.
*/
#ifdef RANDSTRUCT
#include <generated/randstruct_hash.h>
#endif

1
include/linux/vermagic.h
View file

@ -33,7 +33,6 @@
#define MODULE_VERMAGIC_MODVERSIONS ""
#endif
#ifdef RANDSTRUCT
#include <generated/randstruct_hash.h>
#define MODULE_RANDSTRUCT "RANDSTRUCT_" RANDSTRUCT_HASHED_SEED
#else
#define MODULE_RANDSTRUCT