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37 lines
1 KiB
Diff
37 lines
1 KiB
Diff
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From f6110a8fee2ca36f8e2d2abecf3cba9fa7b8ea7d Mon Sep 17 00:00:00 2001
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From: Florian Weimer <fweimer@redhat.com>
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Date: Mon, 19 Jun 2017 17:09:55 +0200
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Subject: [PATCH] CVE-2017-1000366: Ignore LD_LIBRARY_PATH for AT_SECURE=1
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programs [BZ #21624]
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LD_LIBRARY_PATH can only be used to reorder system search paths, which
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is not useful functionality.
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This makes an exploitable unbounded alloca in _dl_init_paths unreachable
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for AT_SECURE=1 programs.
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patch from:
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https://sourceware.org/git/?p=glibc.git;a=commit;h=f6110a8fee2ca36f8e2d2abecf3cba9fa7b8ea7d
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---
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ChangeLog | 7 +++++++
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elf/rtld.c | 3 ++-
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2 files changed, 9 insertions(+), 1 deletion(-)
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diff --git a/elf/rtld.c b/elf/rtld.c
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index 2446a87..2269dbe 100644
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--- a/elf/rtld.c
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+++ b/elf/rtld.c
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@@ -2422,7 +2422,8 @@ process_envvars (enum mode *modep)
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case 12:
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/* The library search path. */
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- if (memcmp (envline, "LIBRARY_PATH", 12) == 0)
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+ if (!__libc_enable_secure
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+ && memcmp (envline, "LIBRARY_PATH", 12) == 0)
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{
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library_path = &envline[13];
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break;
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--
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2.9.3
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