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Thu, 26 Dec 2024 05:45:35 -0500 (EST) From: Celeste Liu Date: Thu, 26 Dec 2024 18:45:09 +0800 Subject: [PATCH v3 1/2] riscv/ptrace: add new regset to access original a0 register MIME-Version: 1.0 Message-Id: <20241226-riscv-new-regset-v3-1-f5b96465826b@coelacanthus.name> References: <20241226-riscv-new-regset-v3-0-f5b96465826b@coelacanthus.name> In-Reply-To: <20241226-riscv-new-regset-v3-0-f5b96465826b@coelacanthus.name> To: Oleg Nesterov , Paul Walmsley , Palmer Dabbelt , Eric Biederman , Kees Cook , Shuah Khan , Albert Ou Cc: Alexandre Ghiti , "Dmitry V. Levin" , Andrea Bolognani , =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= , Thomas Gleixner , Ron Economos , Charlie Jenkins , Andrew Jones , Quan Zhou , Felix Yan , Ruizhe Pan , Guo Ren , Yao Zi , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Celeste Liu , stable@vger.kernel.org, =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=3197; i=uwu@coelacanthus.name; h=from:subject:message-id; bh=ltD8Q1yJuFcwflR+5zmJHqfB8aeFKvQGlw/4hXFU+gg=; b=owJ4nJvAy8zAJeafov85RWVtBeNptSSG9FzjfcFzW5JSdpl75XUxC/ltnaLIqDsn6mp9ALeE/ /UNjTpGnztKWRjEuBhkxRRZ8kpYfnJeOtu9t2N7F8wcViaQIQxcnAIwkbY4hr+CYlO/Xjrb7vv1 +Z2EKf+Uc45vtstX3O5heYTPZ/69PkYfhv+pU2QfOJ+VmqvmXlw/Sez2geWKDfKuot+ldE1LVY8 xbeEGAGoyRRQ= X-Developer-Key: i=uwu@coelacanthus.name; a=openpgp; fpr=892EBC7DC392DFF9C9C03F1D15F4180E73787863 X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 3820B4000F X-Stat-Signature: 4utyunds8dfwtkdggiwz8iy7naftif4w X-Rspam-User: X-HE-Tag: 1735209892-974715 X-HE-Meta: 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 A1C5Nkq4 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 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. Fixes: e2c0cdfba7f6 ("RISC-V: User-facing API") Link: https://lore.kernel.org/all/59505464-c84a-403d-972f-d4b2055eeaac@gmail.com/ Cc: stable@vger.kernel.org Reviewed-by: Björn Töpel 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..ef9ab74c8575a5c440155973b1c625c06a867c97 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 0; +} + 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 */ From patchwork Thu Dec 26 10:45:10 2024 Content-Type: text/plain; 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Thu, 26 Dec 2024 05:45:40 -0500 (EST) From: Celeste Liu Date: Thu, 26 Dec 2024 18:45:10 +0800 Subject: [PATCH v3 2/2] riscv: selftests: Add a ptrace test to verify syscall parameter modification MIME-Version: 1.0 Message-Id: <20241226-riscv-new-regset-v3-2-f5b96465826b@coelacanthus.name> References: <20241226-riscv-new-regset-v3-0-f5b96465826b@coelacanthus.name> In-Reply-To: <20241226-riscv-new-regset-v3-0-f5b96465826b@coelacanthus.name> To: Oleg Nesterov , Paul Walmsley , Palmer Dabbelt , Eric Biederman , Kees Cook , Shuah Khan , Albert Ou Cc: Alexandre Ghiti , "Dmitry V. Levin" , Andrea Bolognani , =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= , Thomas Gleixner , Ron Economos , Charlie Jenkins , Andrew Jones , Quan Zhou , Felix Yan , Ruizhe Pan , Guo Ren , Yao Zi , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Celeste Liu , =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=6180; i=uwu@coelacanthus.name; h=from:subject:message-id; bh=RwziARy9LYogiNaY+tRNajVYbC8xlhPLfEfHo/RnxWo=; b=kA0DAAoWT2Qv82QkrXgByyZiAGdtM8KgQ1i1ZpH3yT+h91v9V4Ml592+z4QJ6bXiI5L5+PGi1 Yh1BAAWCgAdFiEEbnQE+QnSzYu9iLeKT2Qv82QkrXgFAmdtM8IACgkQT2Qv82QkrXj/uwEAiD+r uHX0W2AEe+ETcnP3pFvrPjh7a8vn/lXycVs5DDMBALCLKLmjd2KucK8JkpLyekJvdojEp7TzDND XeXMJ8pkG X-Developer-Key: i=uwu@coelacanthus.name; a=openpgp; fpr=892EBC7DC392DFF9C9C03F1D15F4180E73787863 X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 1DE3080007 X-Stat-Signature: tp8eg5e86tg59pmgtnbozmuainu1uah9 X-Rspam-User: X-HE-Tag: 1735209862-772640 X-HE-Meta: U2FsdGVkX1+tPV2+EmC3xsWGjN1R+oyLLNuXDgPxIt4iA3QHGr9Cx7SOmU9aigaoct/Gr43/ovIssW/TcRmN+R4bNfzOSqQSSCdCdKQ5dL0uZ7p38cRKGZLKC3LYAi+qV6tGlMJclwfhh6y4DxDNv/lonVFRSBtysa9dkAk9F9Fv+fd7DZqq+QuuuAOA6hKRonHtHhpm36i2PDaKSgvahQSImwsoravHURg6aCCV6n5ghDMUDS7r5CDt52MgStlWRAWr+Dm5GlDuCrd1d06arvwSMwqEwcK1ZG5zlySjUzQcxv19nJLufErNc6Zn4nMIaHqsb7DL6upL8rp1gfYXZqEu/vLIOZ0b7HGAC7vArLWoEWOWmsbVOJzavW6QgJRYSxZdVfBpeEBaZGy5U2nemK9p3dNEY4tpEGdTMfo4EmdRbQyC1iP4JjoTyzGBe2EYV2rjyPDOP/0VrcmxBT3aAERpjBETFQMe+EemB78EnEtRW8Z5U0yyn3EEofcL89MuucNplQnebxlLILHcvchPnCfeg6hv77pEfFqRhX+JAhV9hisD/JQmkkpUuu6+jCaAlo+/3O7lYQ7k4ac/vmJOAbl+qJ3jPSmB2QdSExXrZFIM9O/wTFOESVb0lEramCGwJwS0KzA4N0oX08jfEB+qlOkF7q+5rIuqwfkXONNwPmRce5SVpKZ48//rWQJO/GRDMoz8918Im5WZYIRt9S6TU+Hkor6RnY11K8UdUh3j61t3/fi9dBvGqmKdxaR4DQA0YzGhmgL1g7FqU5dJZ4J0CKBXnLBuEmaqdQfb/tZzlj2AQkPSZj1EbyVC/bG5wSVVX1OYff/MNVVkrjgU/nQZeIbif8QqT2eKwmFlkLTSTIXCOftL0v/EwF5++9w3EzazBNL34tEmm96EBCgMwdZVZJAqm5PSYpNWVxROo71FHgpMP7V4gDoyY0dpmE5f5qSVXCDmziG+WI/YIRHet5G fM2iL2Pu qbc9C/loPyFr0hlBemjpT52L/uCibReTeuXqwLcWpBwd7DB/oE5aZ79NyaIrcyVTAgU3hgagHrwf5Y52fufVnpf6su1TFFE2Ox0sY9NdjQspNLGppZ62HgVdQDohqMRdWIGdYFjFceLRwLK8GhgQgB49qGfjLQc/raVccroGeObVU/idZdH+MkaYEgVeVVjmAkfpc8QRhS5q8ZyE2ou0MjNGBhbgURLrx8L/1XhMfvdgBAI5s0OKZn57X0YgbChaZLBbyGs0HicER7FhNlxtezOOn7OSk+xxNilH69lpyh3tRiY1jQsrLBy+2evRr3ogyVMpUs5j4AOmFQxRjjUfcmmc8zxzLbks7KcRNCiuMuFv2bZUUEUoNXM6imuRXf08FaU/aMCMu0zF3QseXrmHBYGYMgENkw7joYD3bGs6BWWfqmDomSuvC5sKcH2puZL2a83ETqRXR+ssBAruWHo2TZjaZ3VOWeSg6UOvFFE+DpCJ4/+c= 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: This test checks that orig_a0 allows a syscall argument to be modified, and that changing a0 does not change the syscall argument. Co-developed-by: Quan Zhou Signed-off-by: Quan Zhou Co-developed-by: Charlie Jenkins Signed-off-by: Charlie Jenkins Reviewed-by: Björn Töpel Signed-off-by: Celeste Liu --- tools/testing/selftests/riscv/abi/.gitignore | 1 + tools/testing/selftests/riscv/abi/Makefile | 5 +- tools/testing/selftests/riscv/abi/ptrace.c | 151 +++++++++++++++++++++++++++ 3 files changed, 156 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/riscv/abi/.gitignore b/tools/testing/selftests/riscv/abi/.gitignore index b38358f91c4d2240ae64892871d9ca98bda1ae58..378c605919a3b3d58eec2701eb7af430cfe315d6 100644 --- a/tools/testing/selftests/riscv/abi/.gitignore +++ b/tools/testing/selftests/riscv/abi/.gitignore @@ -1 +1,2 @@ pointer_masking +ptrace diff --git a/tools/testing/selftests/riscv/abi/Makefile b/tools/testing/selftests/riscv/abi/Makefile index ed82ff9c664e7eb3f760cbab81fb957ff72579c5..3f74d059dfdcbce4d45d8ff618781ccea1419061 100644 --- a/tools/testing/selftests/riscv/abi/Makefile +++ b/tools/testing/selftests/riscv/abi/Makefile @@ -2,9 +2,12 @@ CFLAGS += -I$(top_srcdir)/tools/include -TEST_GEN_PROGS := pointer_masking +TEST_GEN_PROGS := pointer_masking ptrace include ../../lib.mk $(OUTPUT)/pointer_masking: pointer_masking.c $(CC) -static -o$@ $(CFLAGS) $(LDFLAGS) $^ + +$(OUTPUT)/ptrace: ptrace.c + $(CC) -static -o$@ $(CFLAGS) $(LDFLAGS) $^ diff --git a/tools/testing/selftests/riscv/abi/ptrace.c b/tools/testing/selftests/riscv/abi/ptrace.c new file mode 100644 index 0000000000000000000000000000000000000000..c89343cb4abc7da57f83879ecce619f503c438bb --- /dev/null +++ b/tools/testing/selftests/riscv/abi/ptrace.c @@ -0,0 +1,151 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "../../kselftest_harness.h" + +#define ORIG_A0_MODIFY 0x01 +#define A0_MODIFY 0x02 +#define A0_OLD 0x03 +#define A0_NEW 0x04 + +struct a0_regs { + __s64 orig_a0; + __u64 a0; +}; + +#define perr_and_exit(fmt, ...) \ + ({ \ + char buf[256]; \ + snprintf(buf, sizeof(buf), "%s:%d:" fmt ": %m\n", \ + __func__, __LINE__, ##__VA_ARGS__); \ + ksft_exit_fail_perror(buf); \ + }) + +static inline void resume_and_wait_tracee(pid_t pid, int flag) +{ + int status; + + if (ptrace(flag, pid, 0, 0)) + perr_and_exit("failed to resume the tracee %d\n", pid); + + if (waitpid(pid, &status, 0) != pid) + perr_and_exit("failed to wait for the tracee %d\n", pid); +} + +static void ptrace_test(int opt, struct a0_regs *result) +{ + int status; + pid_t pid; + struct user_regs_struct regs; + struct iovec iov = { + .iov_base = ®s, + .iov_len = sizeof(regs), + }; + + unsigned long orig_a0; + struct iovec a0_iov = { + .iov_base = &orig_a0, + .iov_len = sizeof(orig_a0), + }; + struct ptrace_syscall_info syscall_info_entry, syscall_info_exit; + + pid = fork(); + if (pid == 0) { + /* Mark oneself being traced */ + long val = ptrace(PTRACE_TRACEME, 0, 0, 0); + + if (val) + perr_and_exit("failed to request for tracer to trace me: %ld\n", val); + + kill(getpid(), SIGSTOP); + + /* Perform exit syscall that will be intercepted */ + exit(A0_OLD); + } + + if (pid < 0) + ksft_exit_fail_perror("failed to fork"); + + if (waitpid(pid, &status, 0) != pid) + perr_and_exit("failed to wait for the tracee %d\n", pid); + + /* Stop at the entry point of the syscall */ + resume_and_wait_tracee(pid, PTRACE_SYSCALL); + + /* Check tracee regs before the syscall */ + if (ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &iov)) + perr_and_exit("failed to get tracee registers\n"); + if (ptrace(PTRACE_GETREGSET, pid, NT_RISCV_ORIG_A0, &a0_iov)) + perr_and_exit("failed to get tracee registers\n"); + if (orig_a0 != A0_OLD) + perr_and_exit("unexpected orig_a0: 0x%lx\n", orig_a0); + + /* Modify a0/orig_a0 for the syscall */ + switch (opt) { + case A0_MODIFY: + regs.a0 = A0_NEW; + break; + case ORIG_A0_MODIFY: + orig_a0 = A0_NEW; + break; + } + + if (ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &a0_iov)) + perr_and_exit("failed to set tracee registers\n"); + if (ptrace(PTRACE_SETREGSET, pid, NT_RISCV_ORIG_A0, &a0_iov)) + perr_and_exit("failed to set tracee registers\n"); + + if (ptrace(PTRACE_GET_SYSCALL_INFO, pid, PTRACE_SYSCALL_INFO_ENTRY, &syscall_info_entry)) + perr_and_exit("failed to get syscall info of entry\n"); + result->orig_a0 = syscall_info_entry->entry.args[0]; + if (ptrace(PTRACE_GET_SYSCALL_INFO, pid, PTRACE_SYSCALL_INFO_EXIT, &syscall_info_exit)) + perr_and_exit("failed to get syscall info of exit\n"); + result->a0 = syscall_info_exit->exit.rval; + + /* Resume the tracee */ + ptrace(PTRACE_CONT, pid, 0, 0); + if (waitpid(pid, &status, 0) != pid) + perr_and_exit("failed to wait for the tracee\n"); + +} + +TEST(ptrace_modify_a0) +{ + struct a0_regs result; + + ptrace_test(A0_MODIFY, &result); + + /* The modification of a0 cannot affect the first argument of the syscall */ + EXPECT_EQ(A0_OLD, result.orig_a0); + EXPECT_EQ(A0_NEW, result.a0); +} + +TEST(ptrace_modify_orig_a0) +{ + struct a0_regs result; + + ptrace_test(ORIG_A0_MODIFY, &result); + + /* Only modify orig_a0 to change the first argument of the syscall */ + EXPECT_EQ(A0_NEW, result.orig_a0); + /* a0 will keep default value, orig_a0 or -ENOSYS, depends on internal. */ + EXPECT_NE(A0_NEW, result.a0); +} + +TEST_HARNESS_MAIN