提交 b53f27e4 编写于 作者: K Kees Cook 提交者: James Morris

string_helpers: add kstrdup_quotable

Handle allocating and escaping a string safe for logging.
Signed-off-by: NKees Cook <keescook@chromium.org>
Signed-off-by: NJames Morris <james.l.morris@oracle.com>
上级 3c9d6296
......@@ -68,4 +68,6 @@ static inline int string_escape_str_any_np(const char *src, char *dst,
return string_escape_str(src, dst, sz, ESCAPE_ANY_NP, only);
}
char *kstrdup_quotable(const char *src, gfp_t gfp);
#endif
......@@ -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);
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