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Message-ID: <20231016053411.3380-2-kkartik@nvidia.com> Date: Mon, 16 Oct 2023 11:04:04 +0530 From: Kartik <kkartik@...dia.com> To: <thierry.reding@...il.com>, <jonathanh@...dia.com>, <keescook@...omium.org>, <andy@...nel.org>, <akpm@...ux-foundation.org>, <arnd@...db.de>, <ulf.hansson@...aro.org>, <linus.walleij@...aro.org>, <kkartik@...dia.com>, <pshete@...dia.com>, <petlozup@...dia.com>, <frank.li@...o.com>, <robh@...nel.org>, <stefank@...dia.com>, <pdeschrijver@...dia.com>, <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <linux-hardening@...r.kernel.org>, <linux-mm@...ck.org> Subject: [PATCH v5 1/8] mm/util: Introduce kmemdup_array() Introduce kmemdup_array() API to duplicate `n` number of elements from a given array. This internally uses kmemdup to allocate and duplicate the `src` array. Signed-off-by: Kartik <kkartik@...dia.com> --- v4 -> v5: * Simplify the implementation by just returning kmemdup(size_mul). --- include/linux/string.h | 1 + mm/util.c | 17 +++++++++++++++++ 2 files changed, 18 insertions(+) diff --git a/include/linux/string.h b/include/linux/string.h index 3c920b6d609b..fcfa1062c79b 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -180,6 +180,7 @@ extern char *kstrndup(const char *s, size_t len, gfp_t gfp); extern void *kmemdup(const void *src, size_t len, gfp_t gfp) __realloc_size(2); extern void *kvmemdup(const void *src, size_t len, gfp_t gfp) __realloc_size(2); extern char *kmemdup_nul(const char *s, size_t len, gfp_t gfp); +extern void *kmemdup_array(const void *src, size_t element_size, size_t count, gfp_t gfp); extern char **argv_split(gfp_t gfp, const char *str, int *argcp); extern void argv_free(char **argv); diff --git a/mm/util.c b/mm/util.c index 6eddd891198e..8801446140d6 100644 --- a/mm/util.c +++ b/mm/util.c @@ -135,6 +135,23 @@ void *kmemdup(const void *src, size_t len, gfp_t gfp) } EXPORT_SYMBOL(kmemdup); +/** + * kmemdup_array - duplicate a given array. + * + * @src: array to duplicate. + * @element_size: size of each element of array. + * @count: number of elements to duplicate from array. + * @gfp: GFP mask to use. + * + * Return: duplicated array of @src or %NULL in case of error, + * result is physically contiguous. Use kfree() to free. + */ +void *kmemdup_array(const void *src, size_t element_size, size_t count, gfp_t gfp) +{ + return kmemdup(src, size_mul(element_size, count), gfp); +} +EXPORT_SYMBOL(kmemdup_array); + /** * kvmemdup - duplicate region of memory * -- 2.34.1
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