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locale: don't crash if locale-archive contains all zeros

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In case of power failure followed by filesystem issues locale-archive
can end-up containing all zeros. In that case all calls to setlocale()
generate a SIGFPE. This renders a system with a default non-C locale
unbootable.

Avoid this by ignoring the locale instead of generating a SIGFPE.
This commit is contained in:
Aurelien Jarno 2013-12-03 11:16:16 +01:00
parent 520d437b94
commit 18d1425127
2 changed files with 9 additions and 0 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2013-12-03 Aurelien Jarno <aurelien@aurel32.net>
* locale/loadarchive.c (_nl_load_locale_from_archive): Avoid
division by 0.
2013-12-03 Siddhesh Poyarekar <siddhesh@redhat.com>
[BZ #16195]

4
locale/loadarchive.c
View File

@ -274,6 +274,10 @@ _nl_load_locale_from_archive (int category, const char **namep)
namehashtab = (struct namehashent *) ((char *) head
+ head->namehash_offset);
/* Avoid division by 0 if the file is corrupted. */
if (__glibc_unlikely (head->namehash_size == 0))
goto close_and_out;
idx = hval % head->namehash_size;
incr = 1 + hval % (head->namehash_size - 2);