tor-commits December 2016

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[tor/master] changes file for 21035.
by nickm＠torproject.org 23 Dec '16

23 Dec '16

commit aaeb50b2f30218f3e92601cdc0833dd11f624c20 Author: Nick Mathewson <nickm(a)torproject.org> Date: Fri Dec 23 08:08:14 2016 -0500 changes file for 21035. --- changes/bug21035 | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/changes/bug21035 b/changes/bug21035 new file mode 100644 index 0000000..bbf3340 --- /dev/null +++ b/changes/bug21035 @@ -0,0 +1,6 @@ + o Minor bugfixes (portability): + - Avoid crashing when Tor is built using headers that contain + CLOCK_MONOTONIC_COARSE, but then tries to run on an older kernel + without CLOCK_MONOTONIC_COARSE. Fixes bug 21035; bugfix on + 0.2.9.1-alpha. +

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[tor/release-0.2.9] changes file for 21035.
by nickm＠torproject.org 23 Dec '16

23 Dec '16

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[tor/master] Merge branch 'maint-0.2.9'
by nickm＠torproject.org 23 Dec '16

23 Dec '16

commit d528690e90914dfa028b6afbccb80f3b5f02dc87 Merge: a6eaa12 aaeb50b Author: Nick Mathewson <nickm(a)torproject.org> Date: Fri Dec 23 08:08:23 2016 -0500 Merge branch 'maint-0.2.9' changes/bug21035 | 6 ++++++ 1 file changed, 6 insertions(+)

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[tor/release-0.2.9] Merge branch 'maint-0.2.9' into release-0.2.9
by nickm＠torproject.org 23 Dec '16

23 Dec '16

commit 99513f763c1867e0f6f45c47d2ad36c4f4097a42 Merge: 8d3f412 aaeb50b Author: Nick Mathewson <nickm(a)torproject.org> Date: Fri Dec 23 08:08:19 2016 -0500 Merge branch 'maint-0.2.9' into release-0.2.9 changes/bug21035 | 6 ++++++ 1 file changed, 6 insertions(+)

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[tor/maint-0.2.9] Merge branch 'bug21035' into maint-0.2.9
by nickm＠torproject.org 23 Dec '16

23 Dec '16

commit 1d91bf57dfe83a7976d8cf7e5e6a6acfae94d022 Merge: 490cd03 a757f76 Author: Nick Mathewson <nickm(a)torproject.org> Date: Fri Dec 23 08:06:11 2016 -0500 Merge branch 'bug21035' into maint-0.2.9 src/common/compat_time.c | 32 ++++++++++++++++++++++++++++++-- 1 file changed, 30 insertions(+), 2 deletions(-)

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[tor/master] Withstand failures in CLOCK_MONOTONIC_COARSE
by nickm＠torproject.org 23 Dec '16

23 Dec '16

commit a757f769676cf0a942fb1c909ff4cf469d362d12 Author: Nick Mathewson <nickm(a)torproject.org> Date: Wed Dec 21 08:17:26 2016 -0500 Withstand failures in CLOCK_MONOTONIC_COARSE This came up on #21035, where somebody tried to build on a linux system with kernel headers including CLOCK_MONOTONIC_COARSE, then run on a kernel that didn't support it. I've adopted a belt-and-suspenders approach here: we detect failures at initialization time, and we also detect (loudly) failures later on. Fixes bug 21035; bugfix on 0.2.9.1-alpha when we started using monotonic time. --- src/common/compat_time.c | 32 ++++++++++++++++++++++++++++++-- 1 file changed, 30 insertions(+), 2 deletions(-) diff --git a/src/common/compat_time.c b/src/common/compat_time.c index 3493ea0..d044bbe 100644 --- a/src/common/compat_time.c +++ b/src/common/compat_time.c @@ -324,10 +324,27 @@ monotime_diff_nsec(const monotime_t *start, /* end of "__APPLE__" */ #elif defined(HAVE_CLOCK_GETTIME) +#ifdef CLOCK_MONOTONIC_COARSE +/** + * Which clock should we use for coarse-grained monotonic time? By default + * this is CLOCK_MONOTONIC_COARSE, but it might not work -- for example, + * if we're compiled with newer Linux headers and then we try to run on + * an old Linux kernel. In that case, we will fall back to CLOCK_MONOTONIC. + */ +static int clock_monotonic_coarse = CLOCK_MONOTONIC_COARSE; +#endif + static void monotime_init_internal(void) { - /* no action needed. */ +#ifdef CLOCK_MONOTONIC_COARSE + struct timespec ts; + if (clock_gettime(CLOCK_MONOTONIC_COARSE, &ts) < 0) { + log_info(LD_GENERAL, "CLOCK_MONOTONIC_COARSE isn't working (%s); " + "falling back to CLOCK_MONOTONIC.", strerror(errno)); + clock_monotonic_coarse = CLOCK_MONOTONIC; + } +#endif } void @@ -355,7 +372,18 @@ monotime_coarse_get(monotime_coarse_t *out) return; } #endif - int r = clock_gettime(CLOCK_MONOTONIC_COARSE, &out->ts_); + int r = clock_gettime(clock_monotonic_coarse, &out->ts_); + if (PREDICT_UNLIKELY(r < 0) && + errno == EINVAL && + clock_monotonic_coarse == CLOCK_MONOTONIC_COARSE) { + /* We should have caught this at startup in monotime_init_internal! + */ + log_warn(LD_BUG, "Falling back to non-coarse monotonic time %s initial " + "system start?", monotime_initialized?"after":"without"); + clock_monotonic_coarse = CLOCK_MONOTONIC; + r = clock_gettime(clock_monotonic_coarse, &out->ts_); + } + tor_assert(r == 0); } #endif

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[tor/maint-0.2.9] Withstand failures in CLOCK_MONOTONIC_COARSE
by nickm＠torproject.org 23 Dec '16

23 Dec '16

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[tor/release-0.2.9] Withstand failures in CLOCK_MONOTONIC_COARSE
by nickm＠torproject.org 23 Dec '16

23 Dec '16

1 0

[tor/release-0.2.9] Merge branch 'bug21035' into maint-0.2.9
by nickm＠torproject.org 23 Dec '16

23 Dec '16

1 0

[tor/master] Merge branch 'maint-0.2.9'
by nickm＠torproject.org 23 Dec '16

23 Dec '16

commit a6eaa121e47625f9e9195b87c18f85d1307ee409 Merge: df87812 1d91bf5 Author: Nick Mathewson <nickm(a)torproject.org> Date: Fri Dec 23 08:06:19 2016 -0500 Merge branch 'maint-0.2.9' src/common/compat_time.c | 32 ++++++++++++++++++++++++++++++-- 1 file changed, 30 insertions(+), 2 deletions(-)

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tor-commits December 2016