But for the ABI conversion bits, these are just leaf functions and don't
even need unwind tables. Just renumber the registers on Windows to only
used volatile ones.
In doing so, this switches to writing rdrand explicitly. perlasm already
knows how to manually encode it and our minimum assembler versions
surely cover rdrand by now anyway. Also add the .size directive. I'm not
sure what it's used for, but the other files have it.
(This isn't a generally reusable technique. The more complex functions
will need actual unwind codes.)
Bug: 259
Change-Id: I1d5669bcf8b6e34939885d78aea6f60597be1528
Reviewed-on: https://boringssl-review.googlesource.com/c/34867
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: Adam Langley <agl@google.com>
Prior to 82639e6f we used thread-local data for the PRNG state. That
change switched to using a mutex-protected pool instead in order to save
memory in heavily-threaded applications.
However, the pool mutex can get extremely hot in cases where the PRNG is
heavily used. 8e8f2504 was a short-term work around, but supporting both
modes is overly complex.
This change moves back to the state of the prior to 82639e6f. The best
way to review this is to diff the changed files against '82639e6f^' and
note that the only difference is a comment added in rand.c:
https://paste.googleplex.com/4997991748337664
Change-Id: I8febce089696fa6bc39f94f4a1e268127a8f78db
Reviewed-on: https://boringssl-review.googlesource.com/c/34024
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
We switched from thread-local storage to a mutex-pool in 82639e6f53
because, for highly-threaded processes, the memory used by all the
states could be quite large. I had judged that a mutex-pool should be
fine, but had underestimated the PRNG requirements of some of our jobs.
This change makes rand.c support using either thread-locals or a
mutex-pool. Thread-locals are used if fork-unsafe buffering is enabled.
While not strictly related to fork-safety, we already have the
fork-unsafe control, and it's already set by jobs that care a lot about
PRNG performance, so fits quite nicely here.
Change-Id: Iaf1e0171c70d4c8dbe1e42283ea13df5b613cb2d
Reviewed-on: https://boringssl-review.googlesource.com/c/31564
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
This is an extremely important and practical use case. The comment that
state->calls is bounded by the reseed interval isn't quite true. We only
check on entry to the function, which means that it may exceed it by one
call's worth. Switch it to a size_t (which doesn't actually increase
memory because the struct was already padded).
Change-Id: Ia7646fd5b4142789c1d613280223baa4cd1a4a9b
Reviewed-on: https://boringssl-review.googlesource.com/c/32804
Commit-Queue: David Benjamin <davidben@google.com>
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
Previously we used thread-local state objects in rand.c. However, for
applications with large numbers of threads, this can lead to excessive
memory usage.
This change causes us to maintain a mutex-protected pool of state
objects where the size of the pool equals the maximum concurrency of
|RAND_bytes|. This might lead to state objects bouncing between CPUs
more often, but should help the memory usage problem.
Change-Id: Ie83763d3bc139e64ac17bf7e015ad082b2f8a81a
Reviewed-on: https://boringssl-review.googlesource.com/29565
Commit-Queue: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
Reviewed-by: David Benjamin <davidben@google.com>
Previously, delocate.go couldn't handle GOT references and so |stderr|
was a problematic symbol. We can cope with them now, so write FIPS
power-on test and urandom errors to stderr rather than stdout.
Change-Id: If6d7c19ee5f22dcbd74fb01c231500c2e130e6f7
Update-note: resolves internal bug 110102292.
Reviewed-on: https://boringssl-review.googlesource.com/29244
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
crypto/{asn1,x509,x509v3,pem} were skipped as they are still OpenSSL
style.
Change-Id: I3cd9a60e1cb483a981aca325041f3fbce294247c
Reviewed-on: https://boringssl-review.googlesource.com/19504
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
There are still a ton of them, almost exclusively complaints that
function declaration and definitions have different parameter names. I
just fixed a few randomly.
Change-Id: I1072f3dba8f63372cda92425aa94f4aa9e3911fa
Reviewed-on: https://boringssl-review.googlesource.com/18706
Reviewed-by: Steven Valdez <svaldez@google.com>
This was specific to some old software on the test machine. Shrinking
the critical section to not cover getrandom is probably worthwhile
anyway though, so keep it around but make the comment less scary.
Change-Id: I8c17b6688ae93f6aef5d89c252900985d9e7bb52
Reviewed-on: https://boringssl-review.googlesource.com/16992
Reviewed-by: Adam Langley <agl@google.com>
POWER8 has hardware transactional memory, which glibc uses to implement
locks. In some cases, taking a lock begins a transaction, wrapping
arbitrary user code (!) until the lock is released. If the transaction
is aborted, everything rewinds and glibc tries again with some other
implementation.
The kernel will abort the transaction in a variety of cases. Notably, on
a syscall, the transaction aborts and the syscall *does not happen*.
https://www.kernel.org/doc/Documentation/powerpc/transactional_memory.txt
Yet, for some reason, although the relevant change does appear to be in
the kernel, the transaction is being rewound with getrandom happening
anyway. This does not work very well.
Instead, only guard the DRBG access with the lock, not CRYPTO_sysrand.
This lock is only used to protect the DRBG from the destructor that
zeros everything.
Change-Id: Ied8350f1e808a09300651de4200c7b0d07b3a158
Reviewed-on: https://boringssl-review.googlesource.com/16985
Commit-Queue: David Benjamin <davidben@google.com>
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
Without this, trying to trigger the CRNGT on a system with RDRAND won't
work.
Change-Id: I0658a1f045620a2800df36277f67305bc0efff8b
Reviewed-on: https://boringssl-review.googlesource.com/16766
Reviewed-by: Adam Langley <agl@google.com>
FIPS requires that the CTR-DRBG state be zeroed on process exit, however
destructors for thread-local data aren't called when the process exits.
This change maintains a linked-list of thread-local state which is
walked on exit to zero each thread's PRNG state. Any concurrently
running threads block until the process finishes exiting.
Change-Id: Ie5dc18e1bb2941a569d8b309411cf20c9bdf52ef
Reviewed-on: https://boringssl-review.googlesource.com/16764
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
Change-Id: Iab7a738a8981de7c56d1585050e78699cb876dab
Reviewed-on: https://boringssl-review.googlesource.com/16467
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
This change causes FIPS mode to use RDRAND in preference to the kernel's
entropy pool. This prevents issues where the ioctl that we have to do
when getrandom isn't supported transiently reports that the pool is
“empty” and causes us to block.
Change-Id: Iad50e443d88b168bf0b85fe1e91e153d79ab3703
Reviewed-on: https://boringssl-review.googlesource.com/16466
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
OPENSSL_ia32cap_addr avoids any relocations within the module, at the
cost of a runtime TEXTREL, which causes problems in some cases.
(Notably, if someone links us into a binary which uses the GCC "ifunc"
attribute, the loader crashes.)
Fix C references of OPENSSL_ia32cap_addr with a function. This is
analogous to the BSS getters. A follow-up commit will fix perlasm with a
different scheme which avoids calling into a function (clobbering
registers and complicating unwind directives.)
Change-Id: I09d6cda4cec35b693e16b5387611167da8c7a6de
Reviewed-on: https://boringssl-review.googlesource.com/15525
Reviewed-by: Adam Langley <agl@google.com>
Support for platforms that we don't support FIPS on doesn't need to be
in the module. Also, functions for dealing with whether fork-unsafe
buffering is enabled are left out because they aren't implementing any
cryptography and they use global r/w state, making their inclusion
painful.
Change-Id: I71a0123db6f5449e9dfc7ec7dea0944428e661aa
Reviewed-on: https://boringssl-review.googlesource.com/15084
Reviewed-by: Adam Langley <agl@google.com>
