diff mbox series

[v2,07/10] x86: Mark archrandom.h functions __must_check

Message ID 20191106141308.30535-8-rth@twiddle.net
State Accepted
Commit 1640a7b9f48293ef548596bdba4a461a89ceec6e
Headers show
Series Improvements for random.h/archrandom.h | expand

Commit Message

Richard Henderson Nov. 6, 2019, 2:13 p.m. UTC 
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>

---
 arch/x86/include/asm/archrandom.h | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

-- 
2.17.1
diff mbox series

Patch

diff --git a/arch/x86/include/asm/archrandom.h b/arch/x86/include/asm/archrandom.h
index feb59461046c..7a4bb1bd4bdb 100644
--- a/arch/x86/include/asm/archrandom.h
+++ b/arch/x86/include/asm/archrandom.h
@@ -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;
 }