[Bug dynamic-link/21624] ld.so: Unsafe alloca allows local attackers to alias stack and heap (CVE-2017-1000366)

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https://sourceware.org/bugzilla/show_bug.cgi?id=21624

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3c7cd21290cabdadd72984fb69bc51e64ff1002d

commit 3c7cd21290cabdadd72984fb69bc51e64ff1002d
Author: Florian Weimer <fweimer@redhat.com>
Date:   Mon Jun 19 18:31:27 2017 +0200

    CVE-2017-1000366: Ignore LD_LIBRARY_PATH for AT_SECURE=1 programs [BZ
#21624]

    LD_LIBRARY_PATH can only be used to reorder system search paths, which
    is not useful functionality.

    This makes an exploitable unbounded alloca in _dl_init_paths unreachable
    for AT_SECURE=1 programs.

    (cherry picked from commit f6110a8fee2ca36f8e2d2abecf3cba9fa7b8ea7d)

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

Summary of changes:
 ChangeLog  |    7 +++++++
 NEWS       |    1 +
 elf/rtld.c |    3 ++-
 3 files changed, 10 insertions(+), 1 deletions(-)

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