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authorDavid S. Miller <davem@davemloft.net>2012-04-05 05:20:37 -0400
committerDavid S. Miller <davem@davemloft.net>2012-04-05 05:20:37 -0400
commitff9f1c5f324eb53adc23bfb80f3c932760c94149 (patch)
tree73afa06f8bb7a0f5268e7aeb8be0a60b0278ab0a /elf/rtld.c
parente80d6f94e19d17b91e3cd3ada7193cc88f621feb (diff)
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Fix DL_DEBUG_UNUSED to elide the VDSO and handle PLT references properly.
* elf/rtld.c (dl_main): If DL_DEBUG_UNUSED is enabled, turn off lazy binding. * elf/dl-lookup (_dl_lookup_symbol_x): If DL_DEBUG_UNUSED, ignore undefined symbol errors. * elf/rtlc.c (dl_main): Skip VDSO when checking for unused DT_NEEDED entries.
Diffstat (limited to 'elf/rtld.c')
-rw-r--r--elf/rtld.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/elf/rtld.c b/elf/rtld.c
index 1cc9cf3..0362b14 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -1967,7 +1967,12 @@ ERROR: ld.so: object '%s' cannot be loaded as audit interface: %s; ignored.\n",
if (dyn->d_tag == DT_NEEDED)
{
l = l->l_next;
-
+#if defined NEED_DL_SYSINFO || defined NEED_DL_SYSINFO_DSO
+ /* Skip the VDSO since it's not part of the list
+ of objects we brought in via DT_NEEDED entries. */
+ if (l == GLRO(dl_sysinfo_map))
+ l = l->l_next;
+#endif
if (!l->l_used)
{
if (first)
@@ -2500,6 +2505,14 @@ warning: debug option `%s' unknown; try LD_DEBUG=help\n", copy);
++dl_debug;
}
+ if (GLRO(dl_debug_mask) & DL_DEBUG_UNUSED)
+ {
+ /* In order to get an accurate picture of whether a particular
+ DT_NEEDED entry is actually used we have to process both
+ the PLT and non-PLT relocation entries. */
+ GLRO(dl_lazy) = 0;
+ }
+
if (GLRO(dl_debug_mask) & DL_DEBUG_HELP)
{
size_t cnt;