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stackleak: add declarations for global functions

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With -Wmissing-prototypes enabled, the stackleak code produces a couple of
warnings that have no declarations because they are only called from assembler:

stackleak.c:127:25: error: no previous prototype for 'stackleak_erase' [-Werror=missing-prototypes]
stackleak.c:139:25: error: no previous prototype for 'stackleak_erase_on_task_stack' [-Werror=missing-prototypes]
stackleak.c:151:25: error: no previous prototype for 'stackleak_erase_off_task_stack' [-Werror=missing-prototypes]
stackleak.c:159:49: error: no previous prototype for 'stackleak_track_stack' [-Werror=missing-prototypes]

Add declarations to the stackleak header to shut up the warnings.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20231108125843.3806765-7-arnd@kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Arnd Bergmann 2023-11-08 13:58:27 +01:00 committed by Kees Cook
parent 9cca73d7b4
commit 65120498aa
1 changed files with 6 additions and 0 deletions
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6
include/linux/stackleak.h
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@ -14,6 +14,7 @@
#ifdef CONFIG_GCC_PLUGIN_STACKLEAK
#include <asm/stacktrace.h>
#include <linux/linkage.h>
/*
* The lowest address on tsk's stack which we can plausibly erase.
@ -76,6 +77,11 @@ static inline void stackleak_task_init(struct task_struct *t)
# endif
}
asmlinkage void noinstr stackleak_erase(void);
asmlinkage void noinstr stackleak_erase_on_task_stack(void);
asmlinkage void noinstr stackleak_erase_off_task_stack(void);
void __no_caller_saved_registers noinstr stackleak_track_stack(void);
#else /* !CONFIG_GCC_PLUGIN_STACKLEAK */
static inline void stackleak_task_init(struct task_struct *t) { }
#endif