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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2019-01-16 18:10:56 +0000 |
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| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2019-03-22 17:30:39 -0300 |
| commit | 359653aaacad463d916323f03c0ac3c47405aafa (patch) | |
| tree | a7d4de0a3e520ad4d62a2ed11bb63b55607fb160 /ChangeLog | |
| parent | 6e8ba7fd574f530afb9681f21604475d5756d773 (diff) | |
| download | glibc-359653aaacad463d916323f03c0ac3c47405aafa.tar.gz glibc-359653aaacad463d916323f03c0ac3c47405aafa.tar.xz glibc-359653aaacad463d916323f03c0ac3c47405aafa.zip | |
Do not use HP_TIMING_NOW for random bits
This patch removes the HP_TIMING_BITS usage for fast random bits and replace with clock_gettime (CLOCK_MONOTONIC). It has unspecified starting time and nano-second accuracy, so its randomness is significantly better than gettimeofday. Althoug it should incur in more overhead (specially for architecture that support hp-timing), the symbol is also common implemented as a vDSO. Checked on aarch64-linux-gnu, x86_64-linux-gnu, and i686-linux-gnu. I also checked on a i686-gnu build. * include/random-bits.h: New file. * resolv/res_mkquery.c [HP_TIMING_AVAIL] (RANDOM_BITS, (__res_context_mkquery): Remove usage hp-timing usage and replace with random_bits. * resolv/res_send.c [HP_TIMING_AVAIL] (nameserver_offset): Likewise. * sysdeps/posix/tempname.c [HP_TIMING_AVAIL] (__gen_tempname): Likewise.
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index 4c5fa54db3..378f9aaa65 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,13 @@ 2019-03-22 Adhemerval Zanella <adhemerval.zanella@linaro.org> + * include/random-bits.h: New file. + * resolv/res_mkquery.c [HP_TIMING_AVAIL] (RANDOM_BITS, + (__res_context_mkquery): Remove usage hp-timing usage and replace with + random_bits. + * resolv/res_send.c [HP_TIMING_AVAIL] (nameserver_offset): Likewise. + * sysdeps/posix/tempname.c [HP_TIMING_AVAIL] (__gen_tempname): + Likewise. + * include/libc-internal.h (__get_clockfreq): Remove prototype. * rt/Makefile (clock-routines): Remove get_clockfreq. * rt/get_clockfreq.c: Remove file. |