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Jason A. Donenfeld eaad4f9e8f arc4random: simplify design for better safety 
Rather than buffering 16 MiB of entropy in userspace (by way of
chacha20), simply call getrandom() every time.

This approach is doubtlessly slower, for now, but trying to prematurely
optimize arc4random appears to be leading toward all sorts of nasty
properties and gotchas. Instead, this patch takes a much more
conservative approach. The interface is added as a basic loop wrapper
around getrandom(), and then later, the kernel and libc together can
work together on optimizing that.

This prevents numerous issues in which userspace is unaware of when it
really must throw away its buffer, since we avoid buffering all
together. Future improvements may include userspace learning more from
the kernel about when to do that, which might make these sorts of
chacha20-based optimizations more possible. The current heuristic of 16
MiB is meaningless garbage that doesn't correspond to anything the
kernel might know about. So for now, let's just do something
conservative that we know is correct and won't lead to cryptographic
issues for users of this function.

This patch might be considered along the lines of, "optimization is the
root of all evil," in that the much more complex implementation it
replaces moves too fast without considering security implications,
whereas the incremental approach done here is a much safer way of going
about things. Once this lands, we can take our time in optimizing this
properly using new interplay between the kernel and userspace.

getrandom(0) is used, since that's the one that ensures the bytes
returned are cryptographically secure. But on systems without it, we
fallback to using /dev/urandom. This is unfortunate because it means
opening a file descriptor, but there's not much of a choice. Secondly,
as part of the fallback, in order to get more or less the same
properties of getrandom(0), we poll on /dev/random, and if the poll
succeeds at least once, then we assume the RNG is initialized. This is a
rough approximation, as the ancient "non-blocking pool" initialized
after the "blocking pool", not before, and it may not port back to all
ancient kernels, though it does to all kernels supported by glibc
(≥3.2), so generally it's the best approximation we can do.

The motivation for including arc4random, in the first place, is to have
source-level compatibility with existing code. That means this patch
doesn't attempt to litigate the interface itself. It does, however,
choose a conservative approach for implementing it.

Cc: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: Cristian Rodríguez <crrodriguez@opensuse.org>
Cc: Paul Eggert <eggert@cs.ucla.edu>
Cc: Mark Harris <mark.hsj@gmail.com>
Cc: Eric Biggers <ebiggers@kernel.org>
Cc: linux-crypto@vger.kernel.org
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2022-07-27 08:58:27 -03:00
..
net Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
netinet Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
nfs Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
sys ttydefaults.h: Fix CSTATUS to control-t 2022-01-07 00:23:05 +01:00
_G_config.h Post-cleanup 2: minimize _G_config.h. 2018-02-07 10:10:32 -05:00
_itoa.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
a.out.h
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adaptive_spin_count.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
aio_misc.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
allocalim.h
arch-fd_to_filename.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
asm-syntax.h
atomic-machine.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
c++-types.data Add placeholder c++-types.data and *.abilist files. 2015-02-13 15:41:34 -08:00
confstr.h
crti.S Introduce <elf-initfini.h> and ELF_INITFINI for all architectures 2020-02-18 15:12:25 +01:00
crtn.S Introduce <elf-initfini.h> and ELF_INITFINI for all architectures 2020-02-18 15:12:25 +01:00
device-nrs.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dirstream.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-audit-check.h elf: Fix runtime linker auditing on aarch64 (BZ #26643) 2022-02-01 14:49:46 -03:00
dl-auxv.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-cache.h elf: Remove ldconfig kernel version check 2022-05-16 15:03:49 -03:00
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dl-lookupcfg.h elf: Issue la_symbind for bind-now (BZ #23734) 2022-02-01 14:49:46 -03:00
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dl-new-hash.h elf: Optimize _dl_new_hash in dl-new-hash.h 2022-05-23 10:38:40 -05:00
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dl-procinfo.c
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dl-procruntime.c ld.so: Add architecture specific fields 2017-11-13 08:02:52 -08:00
dl-prop.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
dl-protected.h elf: Refine direct extern access diagnostics to protected symbol 2022-06-14 13:07:27 -07:00
dl-r_debug.h elf: Add <dl-r_debug.h> 2022-01-31 07:05:48 -08:00
dl-relocate-ld.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
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dl-tls.h
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dl-vdso-setup.c elf: Move vDSO setup to rtld (BZ#24967) 2020-01-03 11:22:07 -03:00
dl-vdso-setup.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
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eloop-threshold.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
entry.h
errqueue.h
fast-jitter.h sysdeps: Add 'get_fast_jitter' interace in fast-jitter.h 2022-04-27 17:17:43 -05:00
fd_to_filename.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
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fips-private.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
fix-fp-int-compare-invalid.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
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fix-int-fp-convert-zero.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
float128-abi.h Move some float128 symbol version definitions. 2017-10-16 22:04:42 +00:00
fork.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
fpu_control.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
framestate.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
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hp-timing-common.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
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ifreq.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
ifunc-init.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
ifunc-sel.h Do not stack-protect ifunc resolvers [BZ #7065] 2016-12-26 10:08:41 +01:00
internal-signals.h Fix hurd namespace issues for internal signal functions 2022-07-04 11:10:06 -03:00
intr-msg.h
ld.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
ldbl-classify-compat.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
ldconfig.h elf: Remove ldconfig kernel version check 2022-05-16 15:03:49 -03:00
ldsodefs.h elf: Remove ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA 2022-06-15 11:29:55 -07:00
libanl.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libBrokenLocale.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libc_malloc_debug.abilist Move malloc hooks into a compat DSO 2021-07-22 18:37:59 +05:30
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libc-tsd.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
libc.abilist linux: Add pidfd_getfd 2022-05-17 10:33:07 -03:00
libcrypt.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libdl.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libm-alias-double.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
libm-alias-float128.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
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libm-alias-ldouble.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
libm-test-ulps Replace gen-libm-test.pl with gen-libm-test.py. 2018-08-09 15:34:12 +00:00
libm-test-ulps-name Do not hardcode platform names in manual/libm-err-tab.pl (bug 14139). 2016-11-04 16:49:06 +00:00
libm.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libnsl.abilist Add placeholder libnsl.abilist and libutil.abilist files 2016-03-07 00:49:36 +01:00
libnss_compat.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libnss_db.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libnss_dns.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libnss_files.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libnss_hesiod.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libnss_nis.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libnss_nisplus.abilist Add missed zero length files in previous abilist commit. 2012-04-28 15:38:24 -04:00
libpthread.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libresolv.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
librt.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libutil.abilist Add placeholder libnsl.abilist and libutil.abilist files 2016-03-07 00:49:36 +01:00
link_map.h Initial support for GNU_PROPERTY_1_NEEDED 2021-10-07 10:26:08 -07:00
linkmap.h Rename bits/linkmap.h to linkmap.h (bug 14912). 2015-09-04 19:44:27 +00:00
local-setxid.h * sysdeps/posix/spawni.c (__spawni): Use local_seteuid and 2006-06-04 22:17:06 +00:00
localplt.data mtrace: Wean away from malloc hooks 2021-07-22 18:38:06 +05:30
machine-gmon.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
machine-lock.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
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Makefile Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
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malloc-sysdep.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
math_ldbl_opt.h Use PRINTF_LDBL_IS_DBL instead of __ldbl_is_dbl. 2018-12-05 18:15:43 -02:00
math_ldbl.h Allow direct use of math_ldbl.h in testsuite. 2017-02-25 10:40:48 -05:00
math_private_calls.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
math_private.h math: Remove mpa files [BZ #15267] 2021-03-11 14:26:36 +00:00
math-barriers.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
math-nan-payload-double.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
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math-tests-arch.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
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math-type-macros-double.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
math-type-macros-float128.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
math-type-macros-float.h math: Fix float conversion regressions with gcc-12 [BZ #28713] 2022-01-10 14:27:17 +00:00
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math-use-builtins-ceil.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-copysign.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-fabs.h math: Add math-use-builtins-fabs (BZ#29027) 2022-05-23 17:49:18 -03:00
math-use-builtins-floor.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-fma.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-fmax.h math: Add math-use-builtinds-fmax.h 2021-12-13 09:08:07 -03:00
math-use-builtins-fmin.h math: Add math-use-builtinds-fmin.h 2021-12-13 10:08:43 -03:00
math-use-builtins-nearbyint.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-rint.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-round.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-roundeven.h Use GCC builtins for roundeven functions if desired. 2021-06-27 07:56:57 -07:00
math-use-builtins-sqrt.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-trunc.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins.h math: Add math-use-builtins-fabs (BZ#29027) 2022-05-23 17:49:18 -03:00
memcopy.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
mmap_info.h posix: Fix large mmap64 offset for mips64n32 (BZ#24699) 2019-07-10 16:52:50 -03:00
nan-high-order-bit.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
not-cancel.h arc4random: simplify design for better safety 2022-07-27 08:58:27 -03:00
not-errno.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
nscd-types.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
pagecopy.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
paths.h generic paths.h: remove old paths from _PATH_STDPATH 2012-11-04 10:11:39 +01:00
profil-counter.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
pty-private.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
rtld_static_init.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
rtld-lowlevel.h Jakub Jelinek <jakub@redhat.com> 2006-10-10 00:51:29 +00:00
safe-fatal.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
set-hooks-arch.h SET_RELHOOK: merge i386 and x86_64, and move to sysdeps/mach/hurd/x86 2022-02-01 20:08:25 +00:00
setjmpP.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
sigcontextinfo.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
siglist-compat-def.h stdio: Remove the usage of $(fno-unit-at-a-time) for siglist.c 2022-05-13 10:54:41 -03:00
siglist.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
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sigsetops.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
single-thread.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
spawn_int_def.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
stackguard-macros.h BZ #15754: Fix test case for ARM. 2013-09-23 01:44:38 -04:00
stackinfo.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
stap-probe-machine.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
startup.h elf: Remove __libc_init_secure 2022-04-19 15:52:27 -07:00
stdio-lock.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
string_private.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
struct_stat_time64.h linux: Add {f}stat{at} y2038 support 2020-10-09 17:02:07 -03:00
symbol-hacks.h Disable symbol hack in libc_nonshared.a 2021-09-27 07:46:25 -07:00
sysdep-cancel.h nptl: Remove tst-cancel-wrappers test and related macros 2019-01-03 18:38:08 -02:00
sysdep.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
thread_state.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
time64-compat.h y2038: Add support for 64-bit time on legacy ABIs 2021-06-15 10:42:11 -03:00
time-clockid.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
tininess.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
tls-internal-struct.h arc4random: simplify design for better safety 2022-07-27 08:58:27 -03:00
tls-internal.c arc4random: simplify design for better safety 2022-07-27 08:58:27 -03:00
tls-internal.h stdlib: Add arc4random, arc4random_buf, and arc4random_uniform (BZ #4417) 2022-07-22 11:58:27 -03:00
tls-setup.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
tls.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
tst-audit.h Move testsuite audit definitions to sysdeps tst-audit.h files. 2012-07-26 11:29:07 +00:00
tst-file-align.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
tst-stack-align.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
unsecvars.h elf: Remove LD_USE_LOAD_BIAS 2022-02-10 09:18:15 -03:00
unwind-arch.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
unwind-dw2-fde-glibc.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
unwind-dw2-fde.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
unwind-dw2-fde.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
unwind-dw2.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
unwind-link.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
unwind-pe.c Update. 2004-03-10 10:04:19 +00:00
unwind-pe.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
unwind-resume.c Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
unwind-resume.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
unwind.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
utmp-equal.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
xstatver.h Remove mknod wrapper functions, move them to symbols 2020-10-09 17:02:06 -03:00