diff --git a/gnu/local.mk b/gnu/local.mk index 9f8ce842b6..b9b6ea3ae7 100644 --- a/gnu/local.mk +++ b/gnu/local.mk @@ -1078,6 +1078,7 @@ dist_patch_DATA = \ %D%/packages/patches/lierolibre-remove-arch-warning.patch \ %D%/packages/patches/lierolibre-try-building-other-arch.patch \ %D%/packages/patches/linkchecker-tests-require-network.patch \ + %D%/packages/patches/linux-libre-active-entropy.patch \ %D%/packages/patches/linux-pam-no-setfsuid.patch \ %D%/packages/patches/lirc-localstatedir.patch \ %D%/packages/patches/lirc-reproducible-build.patch \ diff --git a/gnu/packages/linux.scm b/gnu/packages/linux.scm index 6664620c04..dda95c29ac 100644 --- a/gnu/packages/linux.scm +++ b/gnu/packages/linux.scm @@ -420,7 +420,8 @@ corresponding UPSTREAM-SOURCE (an origin), using the given DEBLOB-SCRIPTS." (define-public linux-libre-5.2-source (source-with-patches linux-libre-5.2-pristine-source - (list %boot-logo-patch + (list (search-patch "linux-libre-active-entropy.patch") + %boot-logo-patch %linux-libre-arm-export-__sync_icache_dcache-patch))) (define-public linux-libre-4.19-source diff --git a/gnu/packages/patches/linux-libre-active-entropy.patch b/gnu/packages/patches/linux-libre-active-entropy.patch new file mode 100644 index 0000000000..8f081f4a19 --- /dev/null +++ b/gnu/packages/patches/linux-libre-active-entropy.patch @@ -0,0 +1,86 @@ +Try to actively add entropy instead of waiting forever. +Fixes . + +Taken from upstream: +https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/patch/?id=50ee7529ec4500c88f8664560770a7a1b65db72b + +diff --git a/drivers/char/random.c b/drivers/char/random.c +index 5d5ea4ce1442..2fda6166c1dd 100644 +--- a/drivers/char/random.c ++++ b/drivers/char/random.c +@@ -1731,6 +1731,56 @@ void get_random_bytes(void *buf, int nbytes) + } + EXPORT_SYMBOL(get_random_bytes); + ++ ++/* ++ * Each time the timer fires, we expect that we got an unpredictable ++ * jump in the cycle counter. Even if the timer is running on another ++ * CPU, the timer activity will be touching the stack of the CPU that is ++ * generating entropy.. ++ * ++ * Note that we don't re-arm the timer in the timer itself - we are ++ * happy to be scheduled away, since that just makes the load more ++ * complex, but we do not want the timer to keep ticking unless the ++ * entropy loop is running. ++ * ++ * So the re-arming always happens in the entropy loop itself. ++ */ ++static void entropy_timer(struct timer_list *t) ++{ ++ credit_entropy_bits(&input_pool, 1); ++} ++ ++/* ++ * If we have an actual cycle counter, see if we can ++ * generate enough entropy with timing noise ++ */ ++static void try_to_generate_entropy(void) ++{ ++ struct { ++ unsigned long now; ++ struct timer_list timer; ++ } stack; ++ ++ stack.now = random_get_entropy(); ++ ++ /* Slow counter - or none. Don't even bother */ ++ if (stack.now == random_get_entropy()) ++ return; ++ ++ timer_setup_on_stack(&stack.timer, entropy_timer, 0); ++ while (!crng_ready()) { ++ if (!timer_pending(&stack.timer)) ++ mod_timer(&stack.timer, jiffies+1); ++ mix_pool_bytes(&input_pool, &stack.now, sizeof(stack.now)); ++ schedule(); ++ stack.now = random_get_entropy(); ++ } ++ ++ del_timer_sync(&stack.timer); ++ destroy_timer_on_stack(&stack.timer); ++ mix_pool_bytes(&input_pool, &stack.now, sizeof(stack.now)); ++} ++ + /* + * Wait for the urandom pool to be seeded and thus guaranteed to supply + * cryptographically secure random numbers. This applies to: the /dev/urandom +@@ -1745,7 +1795,17 @@ int wait_for_random_bytes(void) + { + if (likely(crng_ready())) + return 0; +- return wait_event_interruptible(crng_init_wait, crng_ready()); ++ ++ do { ++ int ret; ++ ret = wait_event_interruptible_timeout(crng_init_wait, crng_ready(), HZ); ++ if (ret) ++ return ret > 0 ? 0 : ret; ++ ++ try_to_generate_entropy(); ++ } while (!crng_ready()); ++ ++ return 0; + } + EXPORT_SYMBOL(wait_for_random_bytes); +