Quoting Kees Cook (keescook@xxxxxxxxxxxx):
> Provide an escaped (but readable: no inter-argument NULLs) commandline
> safe for logging.
>
> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Acked-by: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx>
> ---
> include/linux/string_helpers.h | 1 +
> lib/string_helpers.c | 34 ++++++++++++++++++++++++++++++++++
> 2 files changed, 35 insertions(+)
>
> 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);
> --
> 2.6.3
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