Merge branch 'mbedtls-2.16' into mbedtls-2.16-restricted

* mbedtls-2.16: (32 commits)
  A different approach of signed-to-unsigned comparison
  Fix bug in redirection of unit test outputs
  Don't forget to free G, P, Q, ctr_drbg, and entropy
  Backport e2k support to mbedtls-2.7
  compat.sh: stop using allow_sha1
  compat.sh: quit using SHA-1 certificates
  compat.sh: enable CBC-SHA-2 suites for GnuTLS
  Fix license header in pre-commit hook
  Update copyright notices to use Linux Foundation guidance
  Fix building on NetBSD 9.0
  Remove obsolete buildbot reference in compat.sh
  Fix misuse of printf in shell script
  Fix added proxy command when IPv6 is used
  Simplify test syntax
  Fix logic error in setting client port
  ssl-opt.sh: include test name in log files
  ssl-opt.sh: remove old buildbot-specific condition
  ssl-opt.sh: add proxy to all DTLS tests
  Log change as bugfix
  Add changelog entry
  ...

ChangeLog.d/bugfix_PR_2632.txt

@@ -0,0 +1,4 @@
+Bugfix
+   * Avoid use of statically sized stack buffers for certificate writing.
+     This previously limited the maximum size of DER encoded certificates
+     in mbedtls_x509write_crt_der() to 2Kb. Reported by soccerGB in #2631.

ChangeLog.d/copyright.txt

@@ -0,0 +1,6 @@
+Changes
+   * Update copyright notices to use Linux Foundation guidance. As a result,
+     the copyright of contributors other than Arm is now acknowledged, and the
+     years of publishing are no longer tracked in the source files. This also
+     eliminates the need for the lines declaring the files to be part of
+     MbedTLS. Fixes #3457.

ChangeLog.d/e2k-support.txt

@@ -0,0 +1,5 @@
+Features
+   * Support building on e2k (Elbrus) architecture: correctly enable
+     -Wformat-signedness, and fix the code that causes signed-one-bit-field
+     and sign-compare warnings. Contributed by makise-homura (Igor Molchanov)
+     <akemi_homura@kurisa.ch>.

ChangeLog.d/fix-build-netbsd.txt

@@ -0,0 +1,5 @@
+Bugfix
+   * Fix building library/net_sockets.c and the ssl_mail_client program on
+     NetBSD. NetBSD conditionals were added for the backport to avoid the risk
+     of breaking a platform. Original fix contributed by Nia Alarie in #3422.
+     Adapted for long-term support branch 2.16 in #3558.

ChangeLog.d/netbsd-rand-arc4random_buf.txt

@@ -0,0 +1,3 @@
+Bugfix
+   * Use arc4random_buf on NetBSD instead of rand implementation with cyclical
+     lower bits. Fix contributed in #3540.

ChangeLog.d/stdout-macro.txt

@@ -0,0 +1,4 @@
+Bugfix
+   * Fix bug in redirection of unit test outputs on platforms where stdout is
+     defined as a macro. First reported in #2311 and fix contributed in #3528.
+     Adopted for LTS branch 2.16 in #3601.

ChangeLog.d/x509write_csr_heap_alloc.txt

@@ -0,0 +1,4 @@
+Bugfix
+   * Reduce the stack consumption of mbedtls_x509write_csr_der() which
+     previously could lead to stack overflow on constrained devices.
+     Contributed by Doru Gucea and Simon Leet in #3464.