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Date: Sun, 27 Jan 2019 21:34:57 -0600
From: "A. Wilcox" <>
Cc: "A. Wilcox" <>
Subject: [PATCH] locale: ensure dcngettext() preserves errno

Some packages call gettext to format a message to be sent to strerror(3).
If the currently set user locale points to a non-existent .mo file,
open(2) via __map_file() in dcngettext() will set errno to ENOENT.

Simple test case is to compile coreutils with NLS enabled and then run
`ls /root` as an unprivileged user.

Before this commit:
ls: cannot open directory '/root': No such file or directory

After this commit:
ls: cannot open directory '/root': Permission denied

Originally reported by aranea on #Adelie.
 src/locale/dcngettext.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/locale/dcngettext.c b/src/locale/dcngettext.c
index 8b891d00..4c304393 100644
--- a/src/locale/dcngettext.c
+++ b/src/locale/dcngettext.c
@@ -122,6 +122,7 @@ char *dcngettext(const char *domainname, const char *msgid1, const char *msgid2,
 	const struct __locale_map *lm;
 	size_t domlen;
 	struct binding *q;
+	int old_errno = errno;
 	if ((unsigned)category >= LC_ALL) goto notrans;
@@ -138,6 +139,7 @@ char *dcngettext(const char *domainname, const char *msgid1, const char *msgid2,
 	lm = loc->cat[category];
 	if (!lm) {
+		errno = old_errno;
 		return (char *) ((n == 1) ? msgid1 : msgid2);
@@ -250,6 +252,7 @@ notrans:
 			trans += l+1;
+	errno = old_errno;
 	return (char *)trans;

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