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gettext: avoid using gettext if the locale dir is not present

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In cc5e1bf992 (gettext: avoid initialization if the locale dir is not
present, 2018-04-21) Git was taught to avoid a costly gettext start-up
when there are not even any localized messages to work with.

But we still called `gettext()` and `ngettext()` functions.

Which caused a problem in Git for Windows when the libgettext that is
consumed from the MSYS2 project stopped using a runtime prefix in
https://github.com/msys2/MINGW-packages/pull/10461

Due to that change, we now use an unintialized gettext machinery that
might get auto-initialized _using an unintended locale directory_:
`C:\mingw64\share\locale`.

Let's record the fact when the gettext initialization was skipped, and
skip calling the gettext functions accordingly.

This addresses CVE-2023-25815.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This commit is contained in:
Johannes Schindelin 2023-02-22 12:40:55 +01:00
parent 2f3b28f272
commit c4137be0f5
2 changed files with 10 additions and 1 deletions
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4
gettext.c
View File

@ -109,6 +109,8 @@ static void init_gettext_charset(const char *domain)
setlocale(LC_CTYPE, "C");
}
int git_gettext_enabled = 0;
void git_setup_gettext(void)
{
const char *podir = getenv(GIT_TEXT_DOMAIN_DIR_ENVIRONMENT);
@ -130,6 +132,8 @@ void git_setup_gettext(void)
init_gettext_charset("git");
textdomain("git");
git_gettext_enabled = 1;
free(p);
}

7
gettext.h
View File

@ -31,9 +31,11 @@
int use_gettext_poison(void);
#ifndef NO_GETTEXT
extern int git_gettext_enabled;
void git_setup_gettext(void);
int gettext_width(const char *s);
#else
#define git_gettext_enabled (0)
static inline void git_setup_gettext(void)
{
use_gettext_poison(); /* getenv() reentrancy paranoia */
@ -48,7 +50,8 @@ static inline FORMAT_PRESERVING(1) const char *_(const char *msgid)
{
if (!*msgid)
return "";
return use_gettext_poison() ? "# GETTEXT POISON #" : gettext(msgid);
return use_gettext_poison() ? "# GETTEXT POISON #" :
!git_gettext_enabled ? msgid : gettext(msgid);
}
static inline FORMAT_PRESERVING(1) FORMAT_PRESERVING(2)
@ -56,6 +59,8 @@ const char *Q_(const char *msgid, const char *plu, unsigned long n)
{
if (use_gettext_poison())
return "# GETTEXT POISON #";
if (!git_gettext_enabled)
return n == 1 ? msgid : plu;
return ngettext(msgid, plu, n);
}