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Date: Fri, 5 Feb 2016 00:43:52 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Kees Cook <keescook@...omium.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Joe Perches <joe@...ches.com>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Daniel Borkmann <daniel@...earbox.net>,
Amitkumar Karwar <akarwar@...vell.com>,
Nishant Sarmukadam <nishants@...vell.com>,
Kalle Valo <kvalo@...eaurora.org>,
Steve French <sfrench@...ba.org>,
Michael Ellerman <mpe@...erman.id.au>,
Heiko Carstens <heiko.carstens@...ibm.com>,
Martin Schwidefsky <schwidefsky@...ibm.com>,
"x86@...nel.org" <x86@...nel.org>, linuxppc-dev@...ts.ozlabs.org,
linux-s390@...r.kernel.org,
"open list:TI WILINK WIRELES..." <linux-wireless@...r.kernel.org>,
netdev <netdev@...r.kernel.org>, linux-cifs@...r.kernel.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/4] lib: move strtobool to kstrtobool
On Thu, Feb 4, 2016 at 11:00 PM, Kees Cook <keescook@...omium.org> wrote:
> Create the kstrtobool_from_user helper and moves strtobool logic into
> the new kstrtobool (matching all the other kstrto* functions). Provides
> an inline wrapper for existing strtobool callers.
>
> Signed-off-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
One minor below.
> ---
> include/linux/kernel.h | 3 +++
> include/linux/string.h | 6 +++++-
> lib/kstrtox.c | 35 +++++++++++++++++++++++++++++++++++
> lib/string.c | 29 -----------------------------
> 4 files changed, 43 insertions(+), 30 deletions(-)
>
> diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> index f31638c6e873..cdc25f47a23f 100644
> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -357,6 +357,7 @@ int __must_check kstrtou16(const char *s, unsigned int base, u16 *res);
> int __must_check kstrtos16(const char *s, unsigned int base, s16 *res);
> int __must_check kstrtou8(const char *s, unsigned int base, u8 *res);
> int __must_check kstrtos8(const char *s, unsigned int base, s8 *res);
> +int __must_check kstrtobool(const char *s, unsigned int base, bool *res);
>
> int __must_check kstrtoull_from_user(const char __user *s, size_t count, unsigned int base, unsigned long long *res);
> int __must_check kstrtoll_from_user(const char __user *s, size_t count, unsigned int base, long long *res);
> @@ -368,6 +369,8 @@ int __must_check kstrtou16_from_user(const char __user *s, size_t count, unsigne
> int __must_check kstrtos16_from_user(const char __user *s, size_t count, unsigned int base, s16 *res);
> int __must_check kstrtou8_from_user(const char __user *s, size_t count, unsigned int base, u8 *res);
> int __must_check kstrtos8_from_user(const char __user *s, size_t count, unsigned int base, s8 *res);
> +int __must_check kstrtobool_from_user(const char __user *s, size_t count,
> + unsigned int base, bool *res);
We already are using long lines here, perhaps do the same?
>
> static inline int __must_check kstrtou64_from_user(const char __user *s, size_t count, unsigned int base, u64 *res)
> {
> diff --git a/include/linux/string.h b/include/linux/string.h
> index 9eebc66d957a..d2fb21b1081d 100644
> --- a/include/linux/string.h
> +++ b/include/linux/string.h
> @@ -128,7 +128,11 @@ extern char **argv_split(gfp_t gfp, const char *str, int *argcp);
> extern void argv_free(char **argv);
>
> extern bool sysfs_streq(const char *s1, const char *s2);
> -extern int strtobool(const char *s, bool *res);
> +extern int kstrtobool(const char *s, unsigned int base, bool *res);
> +static inline int strtobool(const char *s, bool *res)
> +{
> + return kstrtobool(s, 0, res);
> +}
>
> #ifdef CONFIG_BINARY_PRINTF
> int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args);
> diff --git a/lib/kstrtox.c b/lib/kstrtox.c
> index 94be244e8441..e18f088704d7 100644
> --- a/lib/kstrtox.c
> +++ b/lib/kstrtox.c
> @@ -321,6 +321,40 @@ int kstrtos8(const char *s, unsigned int base, s8 *res)
> }
> EXPORT_SYMBOL(kstrtos8);
>
> +/**
> + * kstrtobool - convert common user inputs into boolean values
> + * @s: input string
> + * @base: ignored
> + * @res: result
> + *
> + * This routine returns 0 iff the first character is one of 'Yy1Nn0'.
> + * Otherwise it will return -EINVAL. Value pointed to by res is
> + * updated upon finding a match.
> + */
> +int kstrtobool(const char *s, unsigned int base, bool *res)
> +{
> + if (!s)
> + return -EINVAL;
> +
> + switch (s[0]) {
> + case 'y':
> + case 'Y':
> + case '1':
> + *res = true;
> + return 0;
> + case 'n':
> + case 'N':
> + case '0':
> + *res = false;
> + return 0;
> + default:
> + break;
> + }
> +
> + return -EINVAL;
> +}
> +EXPORT_SYMBOL(kstrtobool);
> +
> #define kstrto_from_user(f, g, type) \
> int f(const char __user *s, size_t count, unsigned int base, type *res) \
> { \
> @@ -345,3 +379,4 @@ kstrto_from_user(kstrtou16_from_user, kstrtou16, u16);
> kstrto_from_user(kstrtos16_from_user, kstrtos16, s16);
> kstrto_from_user(kstrtou8_from_user, kstrtou8, u8);
> kstrto_from_user(kstrtos8_from_user, kstrtos8, s8);
> +kstrto_from_user(kstrtobool_from_user, kstrtobool, bool);
> diff --git a/lib/string.c b/lib/string.c
> index 0323c0d5629a..1a90db9bc6e1 100644
> --- a/lib/string.c
> +++ b/lib/string.c
> @@ -630,35 +630,6 @@ bool sysfs_streq(const char *s1, const char *s2)
> }
> EXPORT_SYMBOL(sysfs_streq);
>
> -/**
> - * strtobool - convert common user inputs into boolean values
> - * @s: input string
> - * @res: result
> - *
> - * This routine returns 0 iff the first character is one of 'Yy1Nn0'.
> - * Otherwise it will return -EINVAL. Value pointed to by res is
> - * updated upon finding a match.
> - */
> -int strtobool(const char *s, bool *res)
> -{
> - switch (s[0]) {
> - case 'y':
> - case 'Y':
> - case '1':
> - *res = true;
> - break;
> - case 'n':
> - case 'N':
> - case '0':
> - *res = false;
> - break;
> - default:
> - return -EINVAL;
> - }
> - return 0;
> -}
> -EXPORT_SYMBOL(strtobool);
> -
> #ifndef __HAVE_ARCH_MEMSET
> /**
> * memset - Fill a region of memory with the given value
> --
> 2.6.3
>
--
With Best Regards,
Andy Shevchenko
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