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authorFlorian Weimer <fweimer@redhat.com>2017-06-19 17:09:55 +0200
committerFlorian Weimer <fweimer@redhat.com>2017-06-19 18:27:30 +0200
commitf6110a8fee2ca36f8e2d2abecf3cba9fa7b8ea7d (patch)
tree16ff41bf5ff4ad2e55eb28b4b7058c6a2784e6fb /elf
parentb08a6a0dea63742313ed3d9577c1e2d83436b196 (diff)
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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.
Diffstat (limited to 'elf')
-rw-r--r--elf/rtld.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/elf/rtld.c b/elf/rtld.c
index 2446a87680..2269dbec81 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -2422,7 +2422,8 @@ process_envvars (enum mode *modep)
 
 	case 12:
 	  /* The library search path.  */
-	  if (memcmp (envline, "LIBRARY_PATH", 12) == 0)
+	  if (!__libc_enable_secure
+	      && memcmp (envline, "LIBRARY_PATH", 12) == 0)
 	    {
 	      library_path = &envline[13];
 	      break;