diff options
Diffstat (limited to 'lib')
-rw-r--r-- | lib/string_helpers.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/lib/string_helpers.c b/lib/string_helpers.c index 5c88204..aa00c9f 100644 --- a/lib/string_helpers.c +++ b/lib/string_helpers.c @@ -10,6 +10,7 @@ #include <linux/export.h> #include <linux/ctype.h> #include <linux/errno.h> +#include <linux/slab.h> #include <linux/string.h> #include <linux/string_helpers.h> @@ -534,3 +535,30 @@ int string_escape_mem(const char *src, size_t isz, char *dst, size_t osz, return p - dst; } EXPORT_SYMBOL(string_escape_mem); + +/* + * Return an allocated string that has been escaped of special characters + * and double quotes, making it safe to log in quotes. + */ +char *kstrdup_quotable(const char *src, gfp_t gfp) +{ + size_t slen, dlen; + char *dst; + const int flags = ESCAPE_HEX; + const char esc[] = "\f\n\r\t\v\a\e\\\""; + + if (!src) + return NULL; + slen = strlen(src); + + dlen = string_escape_mem(src, slen, NULL, 0, flags, esc); + dst = kmalloc(dlen + 1, gfp); + if (!dst) + return NULL; + + WARN_ON(string_escape_mem(src, slen, dst, dlen, flags, esc) != dlen); + dst[dlen] = '\0'; + + return dst; +} +EXPORT_SYMBOL_GPL(kstrdup_quotable); |