From: Stephan Mueller Subject: [PATCH v6 2/5] random: conditionally compile code depending on LRNG Date: Thu, 11 Aug 2016 14:25:17 +0200 Message-ID: <1680213.fEivGm0usC@positron.chronox.de> References: <4723196.TTQvcXsLCG@positron.chronox.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Cc: Ted Tso , sandyinchina@gmail.com, Jason Cooper , John Denker , "H. Peter Anvin" , Joe Perches , Pavel Machek , George Spelvin , linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org To: herbert@gondor.apana.org.au Return-path: In-Reply-To: <4723196.TTQvcXsLCG@positron.chronox.de> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-crypto.vger.kernel.org When selecting the LRNG for compilation, disable the legacy /dev/random implementation. The LRNG is a drop-in replacement for the legacy /dev/random which implements the same in-kernel and user space API. Only the hooks of /dev/random into other parts of the kernel need to be disabled. Signed-off-by: Stephan Mueller --- drivers/char/random.c | 8 ++++++++ include/linux/genhd.h | 5 +++++ include/linux/random.h | 7 ++++++- 3 files changed, 19 insertions(+), 1 deletion(-) diff --git a/drivers/char/random.c b/drivers/char/random.c index 3efb3bf..730a12e 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -270,6 +270,8 @@ #include #include +#ifndef CONFIG_CRYPTO_LRNG + #define CREATE_TRACE_POINTS #include @@ -1898,6 +1900,7 @@ SYSCALL_DEFINE3(getrandom, char __user *, buf, size_t, count, } return urandom_read(NULL, buf, count, NULL); } +#endif /* CONFIG_CRYPTO_LRNG */ /******************************************************************** * @@ -1905,6 +1908,7 @@ SYSCALL_DEFINE3(getrandom, char __user *, buf, size_t, count, * ********************************************************************/ +#ifndef CONFIG_CRYPTO_LRNG #ifdef CONFIG_SYSCTL #include @@ -2042,6 +2046,8 @@ struct ctl_table random_table[] = { }; #endif /* CONFIG_SYSCTL */ +#endif /* CONFIG_CRYPTO_LRNG */ + static u32 random_int_secret[MD5_MESSAGE_BYTES / 4] ____cacheline_aligned; int random_int_secret_init(void) @@ -2119,6 +2125,7 @@ randomize_range(unsigned long start, unsigned long end, unsigned long len) return PAGE_ALIGN(get_random_int() % range + start); } +#ifndef CONFIG_CRYPTO_LRNG /* Interface for in-kernel drivers of true hardware RNGs. * Those devices may produce endless random bits and will be throttled * when our pool is full. @@ -2143,3 +2150,4 @@ void add_hwgenerator_randomness(const char *buffer, size_t count, credit_entropy_bits(poolp, entropy); } EXPORT_SYMBOL_GPL(add_hwgenerator_randomness); +#endif /* CONFIG_CRYPTO_LRNG */ diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 1dbf52f..387770d1 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -437,8 +437,13 @@ extern void disk_flush_events(struct gendisk *disk, unsigned int mask); extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask); /* drivers/char/random.c */ +#ifdef CONFIG_CRYPTO_LRNG +#define add_disk_randomness(disk) do {} while (0) +#define rand_initialize_disk(disk) do {} while (0) +#else extern void add_disk_randomness(struct gendisk *disk); extern void rand_initialize_disk(struct gendisk *disk); +#endif static inline sector_t get_start_sect(struct block_device *bdev) { diff --git a/include/linux/random.h b/include/linux/random.h index 3d6e981..fd39c11 100644 --- a/include/linux/random.h +++ b/include/linux/random.h @@ -17,10 +17,15 @@ struct random_ready_callback { struct module *owner; }; -extern void add_device_randomness(const void *, unsigned int); extern void add_input_randomness(unsigned int type, unsigned int code, unsigned int value); extern void add_interrupt_randomness(int irq, int irq_flags); +#ifdef CONFIG_CRYPTO_LRNG +#define add_device_randomness(buf, nbytes) do {} while (0) +#else /* CONFIG_CRYPTO_LRNG */ +extern void add_device_randomness(const void *, unsigned int); +#define lrng_irq_process() +#endif /* CONFIG_CRYPTO_LRNG */ extern void get_random_bytes(void *buf, int nbytes); extern int add_random_ready_callback(struct random_ready_callback *rdy); -- 2.7.4