Code : libgcrypt

libgcrypt

libgcrypt hosts its code at git://git.gnupg.org/libgcrypt.git.

You can learn more at the project's web page.

Launchpad imports the master branch and you can create branches from it.

You can browse the source code for the development focus branch or get a copy of the branch using the command:
bzr branch lp://staging/libgcrypt

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libgcrypt has 1 active branch owned by 1 team. There were 0 commits in the last month.

Name		Status	Last Modified	Last Commit
lp://staging/libgcrypt Series: trunk		1 Development	2013-10-02 17:47:56 UTC 2013-10-02	1447. Prevent tail call optimization with _... Author: Jussi Kivilinna Revision Date: 2013-10-02 17:47:56 UTC Prevent tail call optimization with _gcry_burn_stack * configure.ac: New check, HAVE_GCC_ASM_VOLATILE_MEMORY. * src/g10lib.h (_gcry_burn_stack): Rename to __gcry_burn_stack. (__gcry_burn_stack_dummy): New. (_gcry_burn_stack): New macro. * src/misc.c (_gcry_burn_stack): Rename to __gcry_burn_stack. (__gcry_burn_stack_dummy): New. -- Tail call optimization can turn _gcry_burn_stack call in to tail jump. When this happens, stack pointer is restored to initial state of current function. This causes problem for _gcry_burn_stack because its callers do not count in current function stack depth. One solution is to prevent gcry_burn_stack being tail optimized by inserting dummy function call behind it. Another would be to add memory barrier 'asm volatile("":::"memory")' behind every _gcry_burn_stack call. This however requires GCC asm support from compiler. Patch adds detection for memory barrier support and when available uses memory barrier to prevent when tail call optimization. If not available dummy function call is used instead. Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>

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