ldconfig: set LC_COLLATE to C [BZ #22505]

ldconfig supports `include' directives and use the glob function to
process them. The glob function sort entries according to the LC_COLLATE
category. When using a standard "include /etc/ld.so.conf.d/*.conf" entry
in /etc/ld.so.conf, the order therefore depends on the locale used to
run ldconfig. A few examples of locale specific order that might be
disturbing in that context compared to the C locale:
- The cs_CZ and sk_SK locales sort the digits after the letters.
- The et_EE locale sorts the 'z' between 's' and 't'.

This patch fixes that by setting LC_COLLATE to C in order to process
files in deterministic order, independently of the locale used to launch
ldconfig.

NOTE: This should NOT be backported to older release branches.

Changelog:
	[BZ #22505]
	* elf/ldconfig.c (main): Call setlocale to force LC_COLLATE to C.

1 files changed, 4 insertions, 0 deletions

diff --git a/elf/ldconfig.c b/elf/ldconfig.c
index 89042351f8..2c01ab567b 100644
--- a/elf/ldconfig.c
+++ b/elf/ldconfig.c
@@ -1259,6 +1259,10 @@ main (int argc, char **argv)
   /* Set locale via LC_ALL.  */
   setlocale (LC_ALL, "");
 
+  /* But keep the C collation.  That way `include' directives using
+     globbing patterns are processed in a locale-independent order.  */
+  setlocale (LC_COLLATE, "C");
+
   /* Set the text message domain.  */
   textdomain (_libc_intl_domainname);