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Tue, 3 Dec 2024 04:31:00 -0500 (EST) From: Celeste Liu Date: Tue, 03 Dec 2024 17:30:04 +0800 Subject: [PATCH v2 1/2] riscv/ptrace: add new regset to access original a0 register MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20241203-riscv-new-regset-v2-1-d37da8c0cba6@coelacanthus.name> References: <20241203-riscv-new-regset-v2-0-d37da8c0cba6@coelacanthus.name> In-Reply-To: <20241203-riscv-new-regset-v2-0-d37da8c0cba6@coelacanthus.name> To: Oleg Nesterov , Paul Walmsley , Palmer Dabbelt , Albert Ou , Eric Biederman , Kees Cook , Shuah Khan Cc: Alexandre Ghiti , "Dmitry V. Levin" , Andrea Bolognani , =?utf-8?q?Bj=C3=B6rn_T=C3=B6pel?= , Thomas Gleixner , Ron Economos , Charlie Jenkins , Quan Zhou , Felix Yan , Ruizhe Pan , Shiqi Zhang , Guo Ren , Yao Zi , Han Gao , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, stable@vger.kernel.org, linux-kselftest@vger.kernel.org, Celeste Liu X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=3101; i=uwu@coelacanthus.name; h=from:subject:message-id; bh=iHUx8lM5PnkP98ImrmiiCww6XfAXRjB9rUvZRyb0f/s=; b=owJ4nJvAy8zAJeafov85RWVtBeNptSSGdL/zxx+VZ1W++qB1xHHrzGuKjCUyRVsbOk4XJ6j3t P8637ea93lHKQuDGBeDrJgiS14Jy0/OS2e793Zs74KZw8oEMoSBi1MAJpIlxvBXIir8ozx/i+Hu n96HPuu7y38t+lPppzX/Sd3a/dZl165MZvhflsT2YfmBIot11vqGDz/vTrwuKxEnvE7p/x3Gimm Lku35ARL3TDc= X-Developer-Key: i=uwu@coelacanthus.name; a=openpgp; fpr=892EBC7DC392DFF9C9C03F1D15F4180E73787863 X-Rspamd-Queue-Id: 7AD1D80016 X-Stat-Signature: ymo1yy8bcwze9dndc6jxgi4da6bf5psc X-Rspam-User: X-Rspamd-Server: rspam09 X-HE-Tag: 1733218239-300661 X-HE-Meta: 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 GNVRrb6D JDp9hs8JzyohV17Xa0wemGM32Ps5OO6XcVw4HgTNV9Aq/mZvcYNevJmGBhYpVNWtayzcf/jVwl3raHO/pyLrnZJWF9N+EmyBVpv66pEAHPHhxiuScVQmDFkbYOHe7qufpng3t1MxFnHXoE1C4knIvv5YK5oLRm20eUf4M+0lsY7eOmfYlMY0/ud9kT73oaESRKW6PPa44ndKLVAXbqnACoF9Ou7/1BWhxPuDkf55g52/4Z2/jQQBxka8vYhwwrHTsV2vU0quGWVMFfRxdA8Hk6k5QFpL6NXisfbbaNprnLh8Cj+B6hmv2eLPCyUTO7iBxpajQsj82C2YWTQne9ozUXyM29FXLNSPviuTJL4EmVqgFYCgxFktmqHnqRUB6VoIK35T0Nvdw+MbB3sw3BhGDeuHPISM4H6NnqUANxzDKgDSXh0c30fYWsCHOC2aUVHiEYJY34AokjIBb/9yQG7zK7eKPFnc1CBMavrisKU/9XdaXkUJbWU+yvLbqYyE7dy5EhE2CBdMQgzd3fjs= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The orig_a0 is missing in struct user_regs_struct of riscv, and there is no way to add it without breaking UAPI. (See Link tag below) Like NT_ARM_SYSTEM_CALL do, we add a new regset name NT_RISCV_ORIG_A0 to access original a0 register from userspace via ptrace API. Link: https://lore.kernel.org/all/59505464-c84a-403d-972f-d4b2055eeaac@gmail.com/ Cc: stable@vger.kernel.org Signed-off-by: Celeste Liu --- arch/riscv/kernel/ptrace.c | 32 ++++++++++++++++++++++++++++++++ include/uapi/linux/elf.h | 1 + 2 files changed, 33 insertions(+) diff --git a/arch/riscv/kernel/ptrace.c b/arch/riscv/kernel/ptrace.c index ea67e9fb7a583683b922fe2c017ea61f3bc848db..18ce07ffb27bb1180667769eed800f6fdf96c083 100644 --- a/arch/riscv/kernel/ptrace.c +++ b/arch/riscv/kernel/ptrace.c @@ -31,6 +31,7 @@ enum riscv_regset { #ifdef CONFIG_RISCV_ISA_SUPM REGSET_TAGGED_ADDR_CTRL, #endif + REGSET_ORIG_A0, }; static int riscv_gpr_get(struct task_struct *target, @@ -184,6 +185,29 @@ static int tagged_addr_ctrl_set(struct task_struct *target, } #endif +static int riscv_orig_a0_get(struct task_struct *target, + const struct user_regset *regset, + struct membuf to) +{ + return membuf_store(&to, task_pt_regs(target)->orig_a0); +} + +static int riscv_orig_a0_set(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + unsigned long orig_a0 = task_pt_regs(target)->orig_a0; + int ret; + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &orig_a0, 0, -1); + if (ret) + return ret; + + task_pt_regs(target)->orig_a0 = orig_a0; + return ret; +} + static const struct user_regset riscv_user_regset[] = { [REGSET_X] = { .core_note_type = NT_PRSTATUS, @@ -224,6 +248,14 @@ static const struct user_regset riscv_user_regset[] = { .set = tagged_addr_ctrl_set, }, #endif + [REGSET_ORIG_A0] = { + .core_note_type = NT_RISCV_ORIG_A0, + .n = 1, + .size = sizeof(elf_greg_t), + .align = sizeof(elf_greg_t), + .regset_get = riscv_orig_a0_get, + .set = riscv_orig_a0_set, + }, }; static const struct user_regset_view riscv_user_native_view = { diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h index b44069d29cecc0f9de90ee66bfffd2137f4275a8..390060229601631da2fb27030d9fa2142e676c14 100644 --- a/include/uapi/linux/elf.h +++ b/include/uapi/linux/elf.h @@ -452,6 +452,7 @@ typedef struct elf64_shdr { #define NT_RISCV_CSR 0x900 /* RISC-V Control and Status Registers */ #define NT_RISCV_VECTOR 0x901 /* RISC-V vector registers */ #define NT_RISCV_TAGGED_ADDR_CTRL 0x902 /* RISC-V tagged address control (prctl()) */ +#define NT_RISCV_ORIG_A0 0x903 /* RISC-V original a0 register */ #define NT_LOONGARCH_CPUCFG 0xa00 /* LoongArch CPU config registers */ #define NT_LOONGARCH_CSR 0xa01 /* LoongArch control and status registers */ #define NT_LOONGARCH_LSX 0xa02 /* LoongArch Loongson SIMD Extension registers */ -- 2.47.0