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Fix CVE-2017-11343:
https://lists.nongnu.org/archive/html/chicken-announce/2017-07/msg00000.html
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-11343
Patch copied from upstream mailing list:
http://lists.gnu.org/archive/html/chicken-hackers/2017-06/txtod8Pa1wGU0.txt
From ae2633195cc5f4f61c9da4ac90f0c14c010dcc3d Mon Sep 17 00:00:00 2001
From: Peter Bex <address@hidden>
Date: Fri, 30 Jun 2017 15:39:45 +0200
Subject: [PATCH 2/2] Initialize symbol table after setting up randomization
Otherwise, the symbol table wouldn't be correctly randomized.
---
NEWS | 3 +++
runtime.c | 2 +-
2 files changed, 4 insertions(+), 1 deletion(-)
#diff --git a/NEWS b/NEWS
#index f4b0e041..6588b30e 100644
#--- a/NEWS
#+++ b/NEWS
#@@ -96,6 +96,9 @@
# buffer overrun and/or segfault (thanks to Lemonboy).
# - CVE-2017-9334: `length' no longer crashes on improper lists (fixes
# #1375, thanks to "megane").
#+ - The randomization factor of the symbol table was set before
#+ the random seed was set, causing it to have a fixed value on many
#+ platforms.
#
# - Core Libraries
# - Unit "posix": If file-lock, file-lock/blocking or file-unlock are
diff --git a/runtime.c b/runtime.c
index 81c54dd2..a4580abc 100644
--- a/runtime.c
+++ b/runtime.c
@@ -799,7 +799,6 @@ int CHICKEN_initialize(int heap, int stack, int symbols, void *toplevel)
C_initial_timer_interrupt_period = INITIAL_TIMER_INTERRUPT_PERIOD;
C_timer_interrupt_counter = INITIAL_TIMER_INTERRUPT_PERIOD;
memset(signal_mapping_table, 0, sizeof(int) * NSIG);
- initialize_symbol_table();
C_dlerror = "cannot load compiled code dynamically - this is a statically linked executable";
error_location = C_SCHEME_FALSE;
C_pre_gc_hook = NULL;
@@ -816,6 +815,7 @@ int CHICKEN_initialize(int heap, int stack, int symbols, void *toplevel)
callback_continuation_level = 0;
gc_ms = 0;
(void)C_randomize(C_fix(time(NULL)));
+ initialize_symbol_table();
if (profiling) {
#ifndef C_NONUNIX
--
2.11.0
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