From patchwork Thu Jun 1 10:12:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 13263352 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 94CDC40785; Thu, 1 Jun 2023 10:14:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8E2E8C433A0; Thu, 1 Jun 2023 10:14:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1685614487; bh=Hrx9VtVZyq4uWMBfRCekQXUO/IA4A1XOafQormtZTuY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gpP21c/RwAJYJm+U25a1tWi/38F4mEWtcst293zmlG6D0PKkBX6d3h9ATwIa7uumf xA2hJJdQXNiMtmOQ7k+n+4Eh/tb5q0l+ZhSYKzMYnVQJJBECXK0Boas7FeJCclB+qU YcYICH1vai6DP7rq0TDqg3DTbnaTA2lnglkoOvwlhDm1fQ7nyhjt7rdP88kQv/EuQI aAPjl78FETn69M4Prx6Edwv1H7cz2NpKwM5xe4vWf7aC2SYCcxtbSZA9vK0QR4+ALQ VYyMUVtF0JdrmF3hiV5k4Z6ygm8TjniyOkfbF+4LCBKjd7eHTl1itn2XLvK6KpbTcp yOKt8OfWFYJOQ== From: Mike Rapoport To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Catalin Marinas , Christophe Leroy , "David S. Miller" , Dinh Nguyen , Heiko Carstens , Helge Deller , Huacai Chen , Kent Overstreet , Luis Chamberlain , Michael Ellerman , Mike Rapoport , "Naveen N. Rao" , Palmer Dabbelt , Russell King , Song Liu , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Will Deacon , bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, netdev@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org Subject: [PATCH 10/13] modules, jitalloc: prepare to allocate executable memory as ROX Date: Thu, 1 Jun 2023 13:12:54 +0300 Message-Id: <20230601101257.530867-11-rppt@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20230601101257.530867-1-rppt@kernel.org> References: <20230601101257.530867-1-rppt@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: "Mike Rapoport (IBM)" When executable memory will be allocated as ROX it won't be possible to update it using memset() and memcpy(). Introduce jit_update_copy() and jit_update_set() APIs and use them in modules loading code instead of memcpy() and memset(). Signed-off-by: Mike Rapoport (IBM) --- include/linux/jitalloc.h | 2 ++ kernel/module/main.c | 19 ++++++++++++++----- mm/jitalloc.c | 20 ++++++++++++++++++++ 3 files changed, 36 insertions(+), 5 deletions(-) diff --git a/include/linux/jitalloc.h b/include/linux/jitalloc.h index 7f8cafb3cfe9..0ba5ef785a85 100644 --- a/include/linux/jitalloc.h +++ b/include/linux/jitalloc.h @@ -55,6 +55,8 @@ struct jit_alloc_params *jit_alloc_arch_params(void); void jit_free(void *buf); void *jit_text_alloc(size_t len); void *jit_data_alloc(size_t len); +void jit_update_copy(void *buf, void *new_buf, size_t len); +void jit_update_set(void *buf, int c, size_t len); #ifdef CONFIG_JIT_ALLOC void jit_alloc_init(void); diff --git a/kernel/module/main.c b/kernel/module/main.c index 91477aa5f671..9f0711c42aa2 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -1197,9 +1197,19 @@ void __weak module_arch_freeing_init(struct module *mod) static void *module_memory_alloc(unsigned int size, enum mod_mem_type type) { - if (mod_mem_type_is_data(type)) - return jit_data_alloc(size); - return jit_text_alloc(size); + void *p; + + if (mod_mem_type_is_data(type)) { + p = jit_data_alloc(size); + if (p) + memset(p, 0, size); + } else { + p = jit_text_alloc(size); + if (p) + jit_update_set(p, 0, size); + } + + return p; } static void module_memory_free(void *ptr, enum mod_mem_type type) @@ -2223,7 +2233,6 @@ static int move_module(struct module *mod, struct load_info *info) t = type; goto out_enomem; } - memset(ptr, 0, mod->mem[type].size); mod->mem[type].base = ptr; } @@ -2251,7 +2260,7 @@ static int move_module(struct module *mod, struct load_info *info) ret = -ENOEXEC; goto out_enomem; } - memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); + jit_update_copy(dest, (void *)shdr->sh_addr, shdr->sh_size); } /* * Update the userspace copy's ELF section address to point to diff --git a/mm/jitalloc.c b/mm/jitalloc.c index 16fd715d501a..a8ae64364d56 100644 --- a/mm/jitalloc.c +++ b/mm/jitalloc.c @@ -7,6 +7,16 @@ static struct jit_alloc_params jit_alloc_params; +static inline void jit_text_poke_copy(void *dst, const void *src, size_t len) +{ + memcpy(dst, src, len); +} + +static inline void jit_text_poke_set(void *addr, int c, size_t len) +{ + memset(addr, c, len); +} + static void *jit_alloc(size_t len, unsigned int alignment, pgprot_t pgprot, unsigned long start, unsigned long end, unsigned long fallback_start, unsigned long fallback_end, @@ -86,6 +96,16 @@ void *jit_data_alloc(size_t len) fallback_start, fallback_end, kasan); } +void jit_update_copy(void *buf, void *new_buf, size_t len) +{ + jit_text_poke_copy(buf, new_buf, len); +} + +void jit_update_set(void *addr, int c, size_t len) +{ + jit_text_poke_set(addr, c, len); +} + struct jit_alloc_params * __weak jit_alloc_arch_params(void) { return NULL;