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| author | David S. Miller <davem@davemloft.net> | 2012-04-05 05:20:37 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-04-05 05:20:37 -0400 |
| commit | ff9f1c5f324eb53adc23bfb80f3c932760c94149 (patch) | |
| tree | 73afa06f8bb7a0f5268e7aeb8be0a60b0278ab0a /elf | |
| parent | e80d6f94e19d17b91e3cd3ada7193cc88f621feb (diff) | |
| download | glibc-ff9f1c5f324eb53adc23bfb80f3c932760c94149.tar.gz | |
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')
| -rw-r--r-- | elf/dl-lookup.c | 3 | ||||
| -rw-r--r-- | elf/rtld.c | 15 |
2 files changed, 16 insertions, 2 deletions
diff --git a/elf/dl-lookup.c b/elf/dl-lookup.c index 839dd3a4fc..a2a699b48f 100644 --- a/elf/dl-lookup.c +++ b/elf/dl-lookup.c @@ -769,7 +769,8 @@ _dl_lookup_symbol_x (const char *undef_name, struct link_map *undef_map, if (__builtin_expect (current_value.s == NULL, 0)) { if ((*ref == NULL || ELFW(ST_BIND) ((*ref)->st_info) != STB_WEAK) - && skip_map == NULL) + && skip_map == NULL + && !(GLRO(dl_debug_mask) & DL_DEBUG_UNUSED)) { /* We could find no value for a strong reference. */ const char *reference_name = undef_map ? undef_map->l_name : ""; diff --git a/elf/rtld.c b/elf/rtld.c index 1cc9cf3fe5..0362b14968 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; |