[git] GCRYPT - branch, LIBGCRYPT-1.8-BRANCH, updated. libgcrypt-1.8.3-2-g20c0348

[by Will Dietz]

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- Log -----------------------------------------------------------------
commit 20c034865f2dd15ce2871385b6e29c15d1570539
Author: Will Dietz <w at wdtz.org>
Date:   Sun Jun 17 18:53:58 2018 -0500

    random: Fix hang of _gcry_rndjent_get_version.
    
    * random/rndjent.c (_gcry_rndjent_get_version): Move locking.
    
    --
    
    cherry-picked from master commit:
        355f5b7f69075c010fe33aa5b10ac60c08fae0c7
    
    While the protection for jent_rng_collector is needed,
    _gcry_rndjent_poll is also acquiring the lock for the variable.
    Thus, it hangs.
    
    This change is sub-optimal, the lock is once released after the call
    of _gcry_rndjent_poll.  It might be good to modify the API of
    _gcry_rndjent_poll to explicitly allow this use case of forcing
    initialization keeping the lock.
    
    Comments and change log entry by gniibe.
    
    GnuPG-bug-id: 4034
    Fixes-commit: 0de2a22fcf6607d0aecb550feefa414cee3731b2

diff --git a/random/rndjent.c b/random/rndjent.c
index 0c5a820..3740ddd 100644
--- a/random/rndjent.c
+++ b/random/rndjent.c
@@ -334,9 +334,10 @@ _gcry_rndjent_get_version (int *r_active)
     {
       if (r_active)
         {
-          lock_rng ();
           /* Make sure the RNG is initialized.  */
           _gcry_rndjent_poll (NULL, 0, 0);
+
+          lock_rng ();
           /* To ease debugging we store 2 for a clock_gettime based
            * implementation and 1 for a rdtsc based code.  */
           *r_active = jent_rng_collector? is_rng_available () : 0;

-----------------------------------------------------------------------

Summary of changes:
 random/rndjent.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)


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