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x86: Mark archrandom.h functions __must_check 

We must not use the pointer output without validating the
success of the random read.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20200110145422.49141-8-broonie@kernel.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Richard Henderson 2020-01-10 14:54:19 +00:00 committed by Theodore Ts'o
parent 904caa6413
commit 1640a7b9f4
1 changed files with 8 additions and 8 deletions
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16
arch/x86/include/asm/archrandom.h
View File

@ -27,7 +27,7 @@
/* Unconditional execution of RDRAND and RDSEED */
static inline bool rdrand_long(unsigned long *v)
static inline bool __must_check rdrand_long(unsigned long *v)
{
bool ok;
unsigned int retry = RDRAND_RETRY_LOOPS;
@ -41,7 +41,7 @@ static inline bool rdrand_long(unsigned long *v)
return false;
}
static inline bool rdrand_int(unsigned int *v)
static inline bool __must_check rdrand_int(unsigned int *v)
{
bool ok;
unsigned int retry = RDRAND_RETRY_LOOPS;
@ -55,7 +55,7 @@ static inline bool rdrand_int(unsigned int *v)
return false;
}
static inline bool rdseed_long(unsigned long *v)
static inline bool __must_check rdseed_long(unsigned long *v)
{
bool ok;
asm volatile(RDSEED_LONG
@ -64,7 +64,7 @@ static inline bool rdseed_long(unsigned long *v)
return ok;
}
static inline bool rdseed_int(unsigned int *v)
static inline bool __must_check rdseed_int(unsigned int *v)
{
bool ok;
asm volatile(RDSEED_INT
@ -80,22 +80,22 @@ static inline bool rdseed_int(unsigned int *v)
*/
#ifdef CONFIG_ARCH_RANDOM
static inline bool arch_get_random_long(unsigned long *v)
static inline bool __must_check arch_get_random_long(unsigned long *v)
{
return static_cpu_has(X86_FEATURE_RDRAND) ? rdrand_long(v) : false;
}
static inline bool arch_get_random_int(unsigned int *v)
static inline bool __must_check arch_get_random_int(unsigned int *v)
{
return static_cpu_has(X86_FEATURE_RDRAND) ? rdrand_int(v) : false;
}
static inline bool arch_get_random_seed_long(unsigned long *v)
static inline bool __must_check arch_get_random_seed_long(unsigned long *v)
{
return static_cpu_has(X86_FEATURE_RDSEED) ? rdseed_long(v) : false;
}
static inline bool arch_get_random_seed_int(unsigned int *v)
static inline bool __must_check arch_get_random_seed_int(unsigned int *v)
{
return static_cpu_has(X86_FEATURE_RDSEED) ? rdseed_int(v) : false;
}