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SubjectRe: Linux messages full of `random: get_random_u32 called from`
On Tue, Apr 24, 2018 at 09:56:21AM -0400, Theodore Y. Ts'o wrote:

> Can you tell me a bit about your system? What distribution, what
> hardware is present in your sytsem (what architecture, what
> peripherals are attached, etc.)?
>
> There's a reason why we made this --- we were declaring the random
> number pool to be fully intialized before it really was, and that was
> a potential security concern. It's not as bad as the weakness
> discovered by Nadia Heninger in 2012. (See https://factorable.net for
> more details.) However, this is not one of those things where we like
> to fool around.
>
> So I want to understand if this is an issue with a particular hardware
> configuration, or whether it's just a badly designed Linux init system
> or embedded setup, or something else. After all, you wouldn't want
> the NSA spying on all of your network traffic, would you? :-)

Why do we continue to print this stuff out when crng_init=1 though ?

(This from debian stable, on a pretty basic atom box, but similar
dmesg's on everything else I've put 4.17-rc on so far)

[ 0.000000] random: get_random_bytes called from start_kernel+0x96/0x519 with crng_init=0
[ 0.000000] random: get_random_u64 called from __kmem_cache_create+0x39/0x450 with crng_init=0
[ 0.000000] random: get_random_u64 called from cache_random_seq_create+0x76/0x120 with crng_init=0
[ 0.151401] calling initialize_ptr_random+0x0/0x36 @ 1
[ 0.151527] initcall initialize_ptr_random+0x0/0x36 returned 0 after 0 usecs
[ 0.294661] calling prandom_init+0x0/0xbd @ 1
[ 0.294763] initcall prandom_init+0x0/0xbd returned 0 after 0 usecs
[ 1.430529] _warn_unseeded_randomness: 165 callbacks suppressed
[ 1.430540] random: get_random_u64 called from __kmem_cache_create+0x39/0x450 with crng_init=0
[ 1.430860] random: get_random_u64 called from cache_random_seq_create+0x76/0x120 with crng_init=0
[ 1.452240] random: get_random_u64 called from copy_process.part.67+0x1ae/0x1e60 with crng_init=0
[ 2.954901] _warn_unseeded_randomness: 54 callbacks suppressed
[ 2.954910] random: get_random_u64 called from __kmem_cache_create+0x39/0x450 with crng_init=0
[ 2.955185] random: get_random_u64 called from cache_random_seq_create+0x76/0x120 with crng_init=0
[ 2.957701] random: get_random_u64 called from __kmem_cache_create+0x39/0x450 with crng_init=0
[ 6.017364] _warn_unseeded_randomness: 88 callbacks suppressed
[ 6.017373] random: get_random_u64 called from __kmem_cache_create+0x39/0x450 with crng_init=0
[ 6.042652] random: get_random_u64 called from cache_random_seq_create+0x76/0x120 with crng_init=0
[ 6.060333] random: get_random_u64 called from __kmem_cache_create+0x39/0x450 with crng_init=0
[ 6.951978] calling prandom_reseed+0x0/0x2a @ 1
[ 6.960627] initcall prandom_reseed+0x0/0x2a returned 0 after 105 usecs
[ 7.371745] _warn_unseeded_randomness: 37 callbacks suppressed
[ 7.371759] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=0
[ 7.395926] random: get_random_u64 called from load_elf_binary+0x4ae/0x1720 with crng_init=0
[ 7.411549] random: get_random_u32 called from arch_align_stack+0x37/0x50 with crng_init=0
[ 7.553379] random: systemd-udevd: uninitialized urandom read (16 bytes read)
[ 7.563210] random: systemd-udevd: uninitialized urandom read (16 bytes read)
[ 7.571498] random: systemd-udevd: uninitialized urandom read (16 bytes read)
[ 8.449679] _warn_unseeded_randomness: 154 callbacks suppressed
[ 8.449691] random: get_random_u64 called from copy_process.part.67+0x1ae/0x1e60 with crng_init=0
[ 8.483097] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=0
[ 8.497999] random: get_random_u64 called from load_elf_binary+0x4ae/0x1720 with crng_init=0
[ 9.353904] random: fast init done
[ 9.770384] _warn_unseeded_randomness: 187 callbacks suppressed
[ 9.770398] random: get_random_u32 called from bucket_table_alloc+0x84/0x1b0 with crng_init=1
[ 9.791514] random: get_random_u32 called from new_slab+0x174/0x680 with crng_init=1
[ 9.834909] random: get_random_u64 called from copy_process.part.67+0x1ae/0x1e60 with crng_init=1
[ 10.802200] _warn_unseeded_randomness: 168 callbacks suppressed
[ 10.802214] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=1
[ 10.802276] random: get_random_u64 called from load_elf_binary+0x4ae/0x1720 with crng_init=1
[ 10.802289] random: get_random_u32 called from arch_align_stack+0x37/0x50 with crng_init=1
[ 11.821109] _warn_unseeded_randomness: 160 callbacks suppressed
[ 11.821122] random: get_random_u64 called from copy_process.part.67+0x1ae/0x1e60 with crng_init=1
[ 11.863770] random: get_random_u32 called from bucket_table_alloc+0x84/0x1b0 with crng_init=1
[ 11.869384] random: get_random_u32 called from new_slab+0x174/0x680 with crng_init=1
[ 12.843237] _warn_unseeded_randomness: 260 callbacks suppressed
[ 12.843251] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=1
[ 12.875369] random: get_random_u64 called from copy_process.part.67+0x1ae/0x1e60 with crng_init=1
[ 12.898152] random: get_random_u32 called from bucket_table_alloc+0x84/0x1b0 with crng_init=1
[ 13.858256] _warn_unseeded_randomness: 245 callbacks suppressed
[ 13.858271] random: get_random_u32 called from new_slab+0x174/0x680 with crng_init=1
[ 13.866366] random: get_random_u32 called from arch_setup_additional_pages+0x79/0xb0 with crng_init=1
[ 13.895379] random: get_random_u32 called from new_slab+0x174/0x680 with crng_init=1
[ 14.896395] _warn_unseeded_randomness: 301 callbacks suppressed
[ 14.896409] random: get_random_u64 called from copy_process.part.67+0x1ae/0x1e60 with crng_init=1
[ 14.921096] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=1
[ 14.935596] random: get_random_u64 called from load_elf_binary+0x4ae/0x1720 with crng_init=1
[ 15.924405] _warn_unseeded_randomness: 152 callbacks suppressed
[ 15.924419] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=1
[ 15.942457] random: get_random_u64 called from load_elf_binary+0x4ae/0x1720 with crng_init=1
[ 15.953995] random: get_random_u32 called from arch_align_stack+0x37/0x50 with crng_init=1
[ 19.295109] _warn_unseeded_randomness: 25 callbacks suppressed
[ 19.295142] random: get_random_u32 called from new_slab+0x174/0x680 with crng_init=1
[ 20.319905] random: get_random_bytes called from flow_hash_from_keys+0x14c/0x2b0 with crng_init=1
[ 21.323229] random: get_random_u64 called from copy_process.part.67+0x1ae/0x1e60 with crng_init=1
[ 21.351464] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=1
[ 21.366761] random: get_random_u64 called from load_elf_binary+0x4ae/0x1720 with crng_init=1
[ 22.367243] _warn_unseeded_randomness: 420 callbacks suppressed
[ 22.367282] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=1
[ 22.367306] random: get_random_u64 called from load_elf_binary+0x4ae/0x1720 with crng_init=1
[ 22.367329] random: get_random_u32 called from arch_align_stack+0x37/0x50 with crng_init=1
[ 23.378128] _warn_unseeded_randomness: 283 callbacks suppressed
[ 23.378141] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=1
[ 23.378164] random: get_random_u64 called from load_elf_binary+0x4ae/0x1720 with crng_init=1
[ 23.378176] random: get_random_u32 called from arch_align_stack+0x37/0x50 with crng_init=1
[ 24.381404] _warn_unseeded_randomness: 246 callbacks suppressed
[ 24.381417] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=1
[ 24.396831] random: get_random_u64 called from load_elf_binary+0x4ae/0x1720 with crng_init=1
[ 24.418850] random: get_random_u32 called from new_slab+0x174/0x680 with crng_init=1
[ 25.391285] _warn_unseeded_randomness: 320 callbacks suppressed
[ 25.391298] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=1
[ 25.417982] random: get_random_u64 called from load_elf_binary+0x4ae/0x1720 with crng_init=1
[ 25.434112] random: get_random_u32 called from arch_align_stack+0x37/0x50 with crng_init=1
[ 26.463997] _warn_unseeded_randomness: 182 callbacks suppressed
[ 26.464009] random: get_random_u64 called from copy_process.part.67+0x1ae/0x1e60 with crng_init=1
[ 26.700479] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=1
[ 26.728446] random: get_random_u64 called from load_elf_binary+0x4ae/0x1720 with crng_init=1
[ 28.393318] _warn_unseeded_randomness: 86 callbacks suppressed
[ 28.393331] random: get_random_bytes called from inet6_ehashfn+0x14c/0x1c0 with crng_init=1
[ 28.414841] random: get_random_bytes called from inet6_ehashfn+0x191/0x1c0 with crng_init=1
[ 28.430781] random: get_random_bytes called from inet_ehashfn+0xe3/0x110 with crng_init=1
[ 33.345320] _warn_unseeded_randomness: 82 callbacks suppressed
[ 33.345334] random: get_random_bytes called from secure_tcp_ts_off+0x83/0xb0 with crng_init=1
[ 33.346074] random: get_random_bytes called from secure_tcp_seq+0x9c/0xc0 with crng_init=1
[ 33.349477] random: get_random_u64 called from copy_process.part.67+0x1ae/0x1e60 with crng_init=1
[ 34.352703] _warn_unseeded_randomness: 78 callbacks suppressed
[ 34.352716] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=1
[ 34.353348] random: get_random_u64 called from load_elf_binary+0x4ae/0x1720 with crng_init=1
[ 34.353716] random: get_random_u32 called from arch_align_stack+0x37/0x50 with crng_init=1
[ 36.444658] _warn_unseeded_randomness: 32 callbacks suppressed
[ 36.444670] random: get_random_u64 called from copy_process.part.67+0x1ae/0x1e60 with crng_init=1
[ 36.453636] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=1
[ 36.454025] random: get_random_u64 called from load_elf_binary+0x4ae/0x1720 with crng_init=1
[ 37.939280] _warn_unseeded_randomness: 53 callbacks suppressed
[ 37.939292] random: get_random_u32 called from new_slab+0x174/0x680 with crng_init=1
[ 42.179988] random: get_random_u32 called from neigh_hash_alloc+0x7b/0xc0 with crng_init=1
[ 44.202043] random: get_random_u32 called from new_slab+0x174/0x680 with crng_init=1
[ 46.035713] random: get_random_u64 called from copy_process.part.67+0x1ae/0x1e60 with crng_init=1
[ 46.067589] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=1
[ 46.085148] random: get_random_u64 called from load_elf_binary+0x4ae/0x1720 with crng_init=1
[ 47.198815] _warn_unseeded_randomness: 7 callbacks suppressed
[ 47.207534] random: get_random_bytes called from __prandom_timer+0x24/0x90 with crng_init=1
[ 53.127055] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=1
[ 53.145929] random: get_random_u64 called from load_elf_binary+0x4ae/0x1720 with crng_init=1
[ 53.165246] random: get_random_u32 called from arch_align_stack+0x37/0x50 with crng_init=1
[ 54.177186] _warn_unseeded_randomness: 75 callbacks suppressed
[ 54.177198] random: get_random_u32 called from new_slab+0x174/0x680 with crng_init=1
[ 54.245759] random: get_random_u64 called from copy_process.part.67+0x1ae/0x1e60 with crng_init=1
[ 54.276658] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=1
[ 55.339125] _warn_unseeded_randomness: 113 callbacks suppressed
[ 55.339137] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=1
[ 55.365379] random: get_random_u64 called from load_elf_binary+0x4ae/0x1720 with crng_init=1
[ 55.383400] random: get_random_u32 called from arch_align_stack+0x37/0x50 with crng_init=1
[ 61.772814] _warn_unseeded_randomness: 6 callbacks suppressed
[ 61.772827] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=1
[ 61.798504] random: get_random_u64 called from load_elf_binary+0x4ae/0x1720 with crng_init=1
[ 61.816345] random: get_random_u32 called from arch_align_stack+0x37/0x50 with crng_init=1
[ 77.460681] _warn_unseeded_randomness: 6 callbacks suppressed
[ 77.460694] random: get_random_u64 called from arch_pick_mmap_layout+0x64/0x130 with crng_init=1
[ 77.487010] random: get_random_u64 called from load_elf_binary+0x4ae/0x1720 with crng_init=1
[ 77.504121] random: get_random_u32 called from arch_align_stack+0x37/0x50 with crng_init=1
[ 80.717699] _warn_unseeded_randomness: 5 callbacks suppressed
[ 80.717714] random: get_random_u32 called from new_slab+0x174/0x680 with crng_init=1
[ 99.514633] random: get_random_u32 called from neigh_hash_alloc+0x7b/0xc0 with crng_init=1
[ 125.914405] random: get_random_bytes called from __prandom_timer+0x24/0x90 with crng_init=1
[ 137.252356] random: get_random_u32 called from new_slab+0x174/0x680 with crng_init=1
[ 165.806247] random: crng init done
[ 165.815049] random: 7 urandom warning(s) missed due to ratelimiting

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