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gutf8: Add ifunc resolver for g_str_is_ascii() too

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Just like how commit ad572e7780 added an
ifunc resolver for `g_utf8_validate()`, we also need to add one for
`g_str_is_ascii()`, as it also calls into the c-utf8 SIMD validation
code which causes false-positive buffer read overflow warnings from
valgrind and asan.

I thought about just adding the `strlen()` call into `g_str_is_ascii()`
unconditionally, as a simpler fix, but from a quick
codesearch.debian.net, it appears `g_str_is_ascii()` is used quite
widely, so this would have an unacceptable performance impact.

This should fix the valgrind failures on the `search-utils` test seen
here: https://gitlab.gnome.org/GNOME/glib/-/jobs/4423753.

Signed-off-by: Philip Withnall <pwithnall@gnome.org>
This commit is contained in:
Philip Withnall 2024-10-22 12:46:16 +01:00
parent 1755024caf
commit cf982177dd
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1 changed files with 40 additions and 3 deletions
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43
glib/gutf8.c
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@ -1969,6 +1969,38 @@ g_utf8_validate_len (const char *str,
return max_len == 0;
}
static gboolean
g_str_is_ascii_native (const char *str)
{
utf8_verify_ascii (&str, NULL);
return *str == 0;
}
#ifdef HAVE_WORKING_IFUNC_ATTRIBUTE
/* See above comment about `ifunc` use for g_utf8_validate(). */
static gboolean
g_str_is_ascii_valgrind (const char *str)
{
size_t len = strlen (str);
utf8_verify_ascii (&str, &len);
return *str == 0;
}
typedef gboolean (*GStrIsAsciiFunc) (const char *str);
static GStrIsAsciiFunc
resolve_g_str_is_ascii (void)
{
if (RUNNING_ON_VALGRIND)
return g_str_is_ascii_valgrind;
else
return g_str_is_ascii_native;
}
#endif /* HAVE_WORKING_IFUNC_ATTRIBUTE */
/**
* g_str_is_ascii:
* @str: a string
@ -1980,13 +2012,18 @@ g_utf8_validate_len (const char *str,
*
* Since: 2.40
*/
#if g_macro__has_attribute(no_sanitize_address)
__attribute__((no_sanitize_address))
#endif
gboolean
g_str_is_ascii (const gchar *str)
#ifdef HAVE_WORKING_IFUNC_ATTRIBUTE
__attribute__((ifunc ("resolve_g_str_is_ascii")));
#else
{
utf8_verify_ascii (&str, NULL);
return *str == 0;
return g_str_is_ascii_native (str);
}
#endif
/**
* g_unichar_validate: