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init: call time_init() before rand_initialize()
commit fe222a6ca2
upstream.
Currently time_init() is called after rand_initialize(), but
rand_initialize() makes use of the timer on various platforms, and
sometimes this timer needs to be initialized by time_init() first. In
order for random_get_entropy() to not return zero during early boot when
it's potentially used as an entropy source, reverse the order of these
two calls. The block doing random initialization was right before
time_init() before, so changing the order shouldn't have any complicated
effects.
Cc: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Stafford Horne <shorne@gmail.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 2 additions and 1 deletions
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@ -1035,11 +1035,13 @@ asmlinkage __visible void __init __no_sanitize_address start_kernel(void)
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softirq_init();
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timekeeping_init();
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kfence_init();
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time_init();
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/*
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* For best initial stack canary entropy, prepare it after:
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* - setup_arch() for any UEFI RNG entropy and boot cmdline access
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* - timekeeping_init() for ktime entropy used in rand_initialize()
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* - time_init() for making random_get_entropy() work on some platforms
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* - rand_initialize() to get any arch-specific entropy like RDRAND
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* - add_latent_entropy() to get any latent entropy
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* - adding command line entropy
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@ -1049,7 +1051,6 @@ asmlinkage __visible void __init __no_sanitize_address start_kernel(void)
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add_device_randomness(command_line, strlen(command_line));
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boot_init_stack_canary();
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time_init();
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perf_event_init();
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profile_init();
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call_function_init();
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