diff options
| -rw-r--r-- | include/linux/string_helpers.h | 1 | ||||
| -rw-r--r-- | lib/string_helpers.c | 34 |
2 files changed, 35 insertions, 0 deletions
diff --git a/include/linux/string_helpers.h b/include/linux/string_helpers.h index 9de228af00c1..684d2695fc36 100644 --- a/include/linux/string_helpers.h +++ b/include/linux/string_helpers.h @@ -69,5 +69,6 @@ static inline int string_escape_str_any_np(const char *src, char *dst, } char *kstrdup_quotable(const char *src, gfp_t gfp); +char *kstrdup_quotable_cmdline(struct task_struct *task, gfp_t gfp); #endif diff --git a/lib/string_helpers.c b/lib/string_helpers.c index aa00c9f989ee..b16ee85aaf87 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/mm.h> #include <linux/slab.h> #include <linux/string.h> #include <linux/string_helpers.h> @@ -562,3 +563,36 @@ char *kstrdup_quotable(const char *src, gfp_t gfp) return dst; } EXPORT_SYMBOL_GPL(kstrdup_quotable); + +/* + * Returns allocated NULL-terminated string containing process + * command line, with inter-argument NULLs replaced with spaces, + * and other special characters escaped. + */ +char *kstrdup_quotable_cmdline(struct task_struct *task, gfp_t gfp) +{ + char *buffer, *quoted; + int i, res; + + buffer = kmalloc(PAGE_SIZE, GFP_TEMPORARY); + if (!buffer) + return NULL; + + res = get_cmdline(task, buffer, PAGE_SIZE - 1); + buffer[res] = '\0'; + + /* Collapse trailing NULLs, leave res pointing to last non-NULL. */ + while (--res >= 0 && buffer[res] == '\0') + ; + + /* Replace inter-argument NULLs. */ + for (i = 0; i <= res; i++) + if (buffer[i] == '\0') + buffer[i] = ' '; + + /* Make sure result is printable. */ + quoted = kstrdup_quotable(buffer, gfp); + kfree(buffer); + return quoted; +} +EXPORT_SYMBOL_GPL(kstrdup_quotable_cmdline); |