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Default branch: MAIN
Current tag: MAIN
Revision 1.16 / (download) - annotate - [select for diffs], Thu Mar 28 18:06:48 2013 UTC (8 weeks, 2 days ago) by tls
CVS Tags: khorben-n900, HEAD
Changes since 1.15: +6 -6 lines
Diff to previous 1.15 (colored)
Re-fix 'fix' for SA-2013-003. Because the original fix evaluated a flag backwards, in low-entropy conditions there was a time interval in which /dev/urandom could still output bits on an unacceptably short key. Output from /dev/random was *NOT* impacted. Eliminate the flag in question -- it's safest to always fill the requested key buffer with output from the entropy-pool, even if we let the caller know we couldn't provide bytes with the full entropy it requested. Advisory will be updated soon with a full worst-case analysis of the /dev/urandom output path in the presence of either variant of the SA-2013-003 bug. Fortunately, because a large amount of other input is mixed in before users can obtain any output, it doesn't look as dangerous in practice as I'd feared it might be.
Revision 1.15 / (download) - annotate - [select for diffs], Sat Jan 26 16:05:34 2013 UTC (3 months, 3 weeks ago) by tls
CVS Tags: tls-maxphys-nbase, tls-maxphys-base, agc-symver-base, agc-symver
Changes since 1.14: +22 -8 lines
Diff to previous 1.14 (colored)
Fix a security issue: when we are reseeding a PRNG seeded early in boot before we had ever had any entropy, if something else has consumed the entropy that triggered the immediate reseed, we can reseed with as little as sizeof(int) bytes of entropy.
Revision 1.14 / (download) - annotate - [select for diffs], Tue Nov 20 11:06:27 2012 UTC (6 months ago) by msaitoh
CVS Tags: yamt-pagecache-base8, yamt-pagecache-base7
Changes since 1.13: +3 -3 lines
Diff to previous 1.13 (colored)
Pass correct wait channel string.
Revision 1.13 / (download) - annotate - [select for diffs], Sat Oct 27 17:34:07 2012 UTC (6 months, 3 weeks ago) by matt
CVS Tags: yamt-pagecache-base6
Changes since 1.12: +4 -4 lines
Diff to previous 1.12 (colored)
Revision 1.12 / (download) - annotate - [select for diffs], Sat Sep 8 02:58:13 2012 UTC (8 months, 2 weeks ago) by msaitoh
Branch point for: tls-maxphys
Changes since 1.11: +4 -3 lines
Diff to previous 1.11 (colored)
Fix a bug that kmem_alloc() is called from the interrupt context.
Revision 1.11 / (download) - annotate - [select for diffs], Fri Sep 7 02:42:13 2012 UTC (8 months, 2 weeks ago) by tls
Changes since 1.10: +3 -2 lines
Diff to previous 1.10 (colored)
Fix kern/46911: note that we rekeyed the cprng so we don't keep doing so.
Revision 1.10 / (download) - annotate - [select for diffs], Wed Sep 5 18:57:34 2012 UTC (8 months, 2 weeks ago) by tls
Changes since 1.9: +9 -3 lines
Diff to previous 1.9 (colored)
Don't wait until the pool *fills* to rekey anything that was keyed with insufficient entropy at boot: key it as soon as it makes any request after we hit the minimum entropy threshold. This too should help avoid predictable output at boot time.
Revision 1.9 / (download) - annotate - [select for diffs], Sat May 19 16:00:41 2012 UTC (12 months ago) by tls
CVS Tags: yamt-pagecache-base5, jmcneill-usbmp-base10
Changes since 1.8: +29 -17 lines
Diff to previous 1.8 (colored)
Fix two problems that could cause /dev/random to not wake up readers when entropy became available.
Revision 1.8 / (download) - annotate - [select for diffs], Tue Apr 17 02:50:39 2012 UTC (13 months, 1 week ago) by tls
CVS Tags: jmcneill-usbmp-base9
Changes since 1.7: +72 -30 lines
Diff to previous 1.7 (colored)
Address multiple problems with rnd(4)/cprng(9): 1) Add a per-cpu CPRNG to handle short reads from /dev/urandom so that programs like perl don't drain the entropy pool dry by repeatedly opening, reading 4 bytes, closing. 2) Really fix the locking around reseeds and destroys. 3) Fix the opportunistic-reseed strategy so it actually works, reseeding existing RNGs once each (as they are used, so idle RNGs don't get reseeded) until the pool is half empty or newly full again.
Revision 1.7 / (download) - annotate - [select for diffs], Tue Apr 10 15:12:40 2012 UTC (13 months, 2 weeks ago) by tls
CVS Tags: yamt-pagecache-base4
Branch point for: yamt-pagecache
Changes since 1.6: +8 -4 lines
Diff to previous 1.6 (colored)
Fix LOCKDEBUG problems pointed out by drochner@ 1) Lock ordering in cprng_strong_destroy had us take a spin mutex then an adaptive mutex. Can't do that. Reordering this requires changing cprng_strong_reseed to tryenter the cprng's own mutex and skip the reseed on failure, or we could deadlock. 2) Can't free memory with a valid mutex in it.
Revision 1.6 / (download) - annotate - [select for diffs], Tue Apr 10 14:02:28 2012 UTC (13 months, 2 weeks ago) by tls
Changes since 1.5: +8 -3 lines
Diff to previous 1.5 (colored)
Add a spin mutex to the rndsink structure; it is used to avoid lock ordering and sleep-holding-locks problems when rekeying, and thus to avoid a nasty race between cprng destruction and reseeding.
Revision 1.5 / (download) - annotate - [select for diffs], Sat Dec 17 20:05:39 2011 UTC (17 months, 1 week ago) by tls
CVS Tags: netbsd-6-base, jmcneill-usbmp-base8, jmcneill-usbmp-base7, jmcneill-usbmp-base6, jmcneill-usbmp-base5, jmcneill-usbmp-base4, jmcneill-usbmp-base3, jmcneill-usbmp-base2
Branch point for: netbsd-6
Changes since 1.4: +77 -66 lines
Diff to previous 1.4 (colored)
Separate /dev/random pseudodevice implemenation from kernel entropy pool implementation. Rewrite pseudodevice code to use cprng_strong(9). The new pseudodevice is cloning, so each caller gets bits from a stream generated with its own key. Users of /dev/urandom get their generators keyed on a "best effort" basis -- the kernel will rekey generators whenever the entropy pool hits the high water mark -- while users of /dev/random get their generators rekeyed every time key-length bits are output. The underlying cprng_strong API can use AES-256 or AES-128, but we use AES-128 because of concerns about related-key attacks on AES-256. This improves performance (and reduces entropy pool depletion) significantly for users of /dev/urandom but does cause users of /dev/random to rekey twice as often. Also fixes various bugs (including some missing locking and a reseed-counter overflow in the CTR_DRBG code) found while testing this. For long reads, this generator is approximately 20 times as fast as the old generator (dd with bs=64K yields 53MB/sec on 2Ghz Core2 instead of 2.5MB/sec) and also uses a separate mutex per instance so concurrency is greatly improved. For reads of typical key sizes for modern cryptosystems (16-32 bytes) performance is about the same as the old code: a little better for 32 bytes, a little worse for 16 bytes.
Revision 1.4 / (download) - annotate - [select for diffs], Tue Nov 29 21:48:22 2011 UTC (17 months, 3 weeks ago) by njoly
CVS Tags: jmcneill-usbmp-pre-base2, jmcneill-usbmp-base
Branch point for: jmcneill-usbmp
Changes since 1.3: +3 -3 lines
Diff to previous 1.3 (colored)
One semicolon is enough.
Revision 1.3 / (download) - annotate - [select for diffs], Tue Nov 29 03:50:31 2011 UTC (17 months, 3 weeks ago) by tls
Changes since 1.2: +3 -2 lines
Diff to previous 1.2 (colored)
Remove rnd_extract_data from the public kernel API (it is for use by the stream generators only). Clean up some related minor issues.
Revision 1.2 / (download) - annotate - [select for diffs], Mon Nov 21 13:44:38 2011 UTC (18 months ago) by tsutsui
Changes since 1.1: +4 -2 lines
Diff to previous 1.1 (colored)
Include MD <machine/cpu_counter.h> only if defined(__HAVE_CPU_COUNTER). XXX: Why not timecounter(9) but deprecated cpu_counter32() and microtime(9)?
Revision 1.1 / (download) - annotate - [select for diffs], Sat Nov 19 22:51:25 2011 UTC (18 months ago) by tls
First step of random number subsystem rework described in <20111022023242.BA26F14A158@mail.netbsd.org>. This change includes the following: An initial cleanup and minor reorganization of the entropy pool code in sys/dev/rnd.c and sys/dev/rndpool.c. Several bugs are fixed. Some effort is made to accumulate entropy more quickly at boot time. A generic interface, "rndsink", is added, for stream generators to request that they be re-keyed with good quality entropy from the pool as soon as it is available. The arc4random()/arc4randbytes() implementation in libkern is adjusted to use the rndsink interface for rekeying, which helps address the problem of low-quality keys at boot time. An implementation of the FIPS 140-2 statistical tests for random number generator quality is provided (libkern/rngtest.c). This is based on Greg Rose's implementation from Qualcomm. A new random stream generator, nist_ctr_drbg, is provided. It is based on an implementation of the NIST SP800-90 CTR_DRBG by Henric Jungheim. This generator users AES in a modified counter mode to generate a backtracking-resistant random stream. An abstraction layer, "cprng", is provided for in-kernel consumers of randomness. The arc4random/arc4randbytes API is deprecated for in-kernel use. It is replaced by "cprng_strong". The current cprng_fast implementation wraps the existing arc4random implementation. The current cprng_strong implementation wraps the new CTR_DRBG implementation. Both interfaces are rekeyed from the entropy pool automatically at intervals justifiable from best current cryptographic practice. In some quick tests, cprng_fast() is about the same speed as the old arc4randbytes(), and cprng_strong() is about 20% faster than rnd_extract_data(). Performance is expected to improve. The AES code in src/crypto/rijndael is no longer an optional kernel component, as it is required by cprng_strong, which is not an optional kernel component. The entropy pool output is subjected to the rngtest tests at startup time; if it fails, the system will reboot. There is approximately a 3/10000 chance of a false positive from these tests. Entropy pool _input_ from hardware random numbers is subjected to the rngtest tests at attach time, as well as the FIPS continuous-output test, to detect bad or stuck hardware RNGs; if any are detected, they are detached, but the system continues to run. A problem with rndctl(8) is fixed -- datastructures with pointers in arrays are no longer passed to userspace (this was not a security problem, but rather a major issue for compat32). A new kernel will require a new rndctl. The sysctl kern.arandom() and kern.urandom() nodes are hooked up to the new generators, but the /dev/*random pseudodevices are not, yet. Manual pages for the new kernel interfaces are forthcoming.
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