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authorSiddhesh Poyarekar <siddhesh@redhat.com>2013-05-29 21:30:20 +0530
committerSiddhesh Poyarekar <siddhesh@redhat.com>2013-05-29 21:34:12 +0530
commitb937534868c8d7aec3b6d645bf5fd657bbfccd42 (patch)
tree18936faaea13f35bcaf698f97447752c0e1c4567 /elf/tst-null-argv.c
parentd0501bfbe228897c17875fcead8809d017135d6f (diff)
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Avoid crashing in LD_DEBUG when program name is unavailable
Resolves: #15465 The program name may be unavailable if the user application tampers with argc and argv[]. Some parts of the dynamic linker caters for this while others don't, so this patch consolidates the check and fallback into a single macro and updates all users.
Diffstat (limited to 'elf/tst-null-argv.c')
-rw-r--r--elf/tst-null-argv.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/elf/tst-null-argv.c b/elf/tst-null-argv.c
new file mode 100644
index 0000000000..dc242e495d
--- /dev/null
+++ b/elf/tst-null-argv.c
@@ -0,0 +1,35 @@
+/* Verify that program does not crash when LD_DEBUG is set and the program name
+ is not available.
+ Copyright (C) 2013 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+extern void foo (void);
+
+int
+do_test (int argc, char **argv)
+{
+ argv[0] = argv[1];
+ argc--;
+
+ /* This should result in a symbol lookup, causing a volley of debug output
+ when LD_DEBUG=symbols. */
+ foo ();
+
+ return 0;
+}
+
+#include <test-skeleton.c>