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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1712851409; bh=cENIBA3iYOmaUBlvaH6AHVDS8Oi8YHeSCX1M4uQK1+g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=j/I3kYyASz3jRj3IBv0xPGti1R9fc4sE0HhRO8zaPGh5Vk+vkDBHxC+pzR2FUwfuR KnpDikB8wMbbeAqJAtMLwAeVL1eJvfDjozH0NtgeS49EL95J770yIrp9g0nlg6iomh AlqQRMWFh3zN4BL/VZI5Jp9oHmPxYrGaPu9PUdFJCOqFHRs+W+gpJZRz140wbgg5EZ xbIPlN1AXz1UpUSuTKdbXAesib8tJHXu3g3JSzCdFAUT/mQV9vKni9IhxeHqfEG958 Ff9bC4fhYXGks5Ttq2rANZs8q+xgorE8R7v/aOeje6wOIf4JJRY4ood7R8dYzsbCUV suRcoWyHa9FMg== From: Mike Rapoport To: linux-kernel@vger.kernel.org Cc: Alexandre Ghiti , Andrew Morton , =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= , Catalin Marinas , Christophe Leroy , "David S. Miller" , Dinh Nguyen , Donald Dutile , Eric Chanudet , Heiko Carstens , Helge Deller , Huacai Chen , Kent Overstreet , Luis Chamberlain , Mark Rutland , Michael Ellerman , Mike Rapoport , Nadav Amit , Palmer Dabbelt , Puranjay Mohan , Rick Edgecombe , Russell King , Song Liu , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Will Deacon , bpf@vger.kernel.org, linux-arch@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 v4 10/15] powerpc: extend execmem_params for kprobes allocations Date: Thu, 11 Apr 2024 19:00:46 +0300 Message-ID: <20240411160051.2093261-11-rppt@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240411160051.2093261-1-rppt@kernel.org> References: <20240411160051.2093261-1-rppt@kernel.org> Precedence: bulk X-Mailing-List: sparclinux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: "Mike Rapoport (IBM)" powerpc overrides kprobes::alloc_insn_page() to remove writable permissions when STRICT_MODULE_RWX is on. Add definition of EXECMEM_KRPOBES to execmem_params to allow using the generic kprobes::alloc_insn_page() with the desired permissions. As powerpc uses breakpoint instructions to inject kprobes, it does not need to constrain kprobe allocations to the modules area and can use the entire vmalloc address space. Signed-off-by: Mike Rapoport (IBM) --- arch/powerpc/kernel/kprobes.c | 20 -------------------- arch/powerpc/kernel/module.c | 11 +++++++++++ 2 files changed, 11 insertions(+), 20 deletions(-) diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c index 9fcd01bb2ce6..14c5ddec3056 100644 --- a/arch/powerpc/kernel/kprobes.c +++ b/arch/powerpc/kernel/kprobes.c @@ -126,26 +126,6 @@ kprobe_opcode_t *arch_adjust_kprobe_addr(unsigned long addr, unsigned long offse return (kprobe_opcode_t *)(addr + offset); } -void *alloc_insn_page(void) -{ - void *page; - - page = execmem_alloc(EXECMEM_KPROBES, PAGE_SIZE); - if (!page) - return NULL; - - if (strict_module_rwx_enabled()) { - int err = set_memory_rox((unsigned long)page, 1); - - if (err) - goto error; - } - return page; -error: - execmem_free(page); - return NULL; -} - int arch_prepare_kprobe(struct kprobe *p) { int ret = 0; diff --git a/arch/powerpc/kernel/module.c b/arch/powerpc/kernel/module.c index 5a1d0490c831..a1eaa74f2d41 100644 --- a/arch/powerpc/kernel/module.c +++ b/arch/powerpc/kernel/module.c @@ -95,6 +95,9 @@ static struct execmem_info execmem_info __ro_after_init = { [EXECMEM_DEFAULT] = { .alignment = 1, }, + [EXECMEM_KPROBES] = { + .alignment = 1, + }, [EXECMEM_MODULE_DATA] = { .alignment = 1, }, @@ -137,5 +140,13 @@ struct execmem_info __init *execmem_arch_setup(void) text->pgprot = prot; + execmem_info.ranges[EXECMEM_KPROBES].start = VMALLOC_START; + execmem_info.ranges[EXECMEM_KPROBES].start = VMALLOC_END; + + if (strict_module_rwx_enabled()) + execmem_info.ranges[EXECMEM_KPROBES].pgprot = PAGE_KERNEL_ROX; + else + execmem_info.ranges[EXECMEM_KPROBES].pgprot = PAGE_KERNEL_EXEC; + return &execmem_info; }