[Bug libc/20435] Missing unwind info in __startcontext causes infinite loop in _Unwind_Backtrace (CVE-2016-6323)

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https://sourceware.org/bugzilla/show_bug.cgi?id=20435

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9e2ff6c9cc54c0b4402b8d49e4abe7000fde7617

commit 9e2ff6c9cc54c0b4402b8d49e4abe7000fde7617
Author: Andreas Schwab <schwab@suse.de>
Date:   Mon Aug 8 09:29:18 2016 +0200

    arm: mark __startcontext as .cantunwind (bug 20435)

    __startcontext marks the bottom of the call stack of the contexts created
    by makecontext.

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Summary of changes:
 ChangeLog                                |    6 ++++++
 sysdeps/unix/sysv/linux/arm/setcontext.S |    7 +++++++
 2 files changed, 13 insertions(+), 0 deletions(-)

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