From: Amanieu d'Antras <amanieu@gmail.com> To: unlisted-recipients:; (no To-header on input) Cc: Amanieu d'Antras <amanieu@gmail.com>, Ryan Houdek <Houdek.Ryan@fex-emu.org>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Mark Rutland <mark.rutland@arm.com>, Steven Price <steven.price@arm.com>, Arnd Bergmann <arnd@kernel.org>, David Laight <David.Laight@aculab.com>, Mark Brown <broonie@kernel.org>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [RESEND PATCH v4 4/8] arm64: Separate in_compat_syscall from is_compat_task Date: Tue, 18 May 2021 10:06:54 +0100 [thread overview] Message-ID: <20210518090658.9519-5-amanieu@gmail.com> (raw) In-Reply-To: <20210518090658.9519-1-amanieu@gmail.com> This is preliminary work for allowing 64-bit processes to invoke compat syscalls. Signed-off-by: Amanieu d'Antras <amanieu@gmail.com> Co-developed-by: Ryan Houdek <Houdek.Ryan@fex-emu.org> Signed-off-by: Ryan Houdek <Houdek.Ryan@fex-emu.org> --- arch/arm64/include/asm/compat.h | 24 ++++++++++++++++++++---- arch/arm64/include/asm/ftrace.h | 2 +- arch/arm64/include/asm/syscall.h | 6 +++--- arch/arm64/kernel/ptrace.c | 2 +- arch/arm64/kernel/syscall.c | 2 +- 5 files changed, 26 insertions(+), 10 deletions(-) diff --git a/arch/arm64/include/asm/compat.h b/arch/arm64/include/asm/compat.h index 23a9fb73c04f..a2f5001f7793 100644 --- a/arch/arm64/include/asm/compat.h +++ b/arch/arm64/include/asm/compat.h @@ -178,21 +178,37 @@ struct compat_shmid64_ds { compat_ulong_t __unused5; }; -static inline int is_compat_task(void) +static inline bool is_compat_task(void) { return test_thread_flag(TIF_32BIT); } -static inline int is_compat_thread(struct thread_info *thread) +static inline bool is_compat_thread(struct thread_info *thread) { return test_ti_thread_flag(thread, TIF_32BIT); } +static inline bool in_compat_syscall(void) +{ + return is_compat_task(); +} +#define in_compat_syscall in_compat_syscall /* override the generic impl */ + +static inline bool thread_in_compat_syscall(struct thread_info *thread) +{ + return is_compat_thread(thread); +} + #else /* !CONFIG_COMPAT */ -static inline int is_compat_thread(struct thread_info *thread) +static inline bool is_compat_thread(struct thread_info *thread) +{ + return false; +} + +static inline bool thread_in_compat_syscall(struct thread_info *thread) { - return 0; + return false; } #endif /* CONFIG_COMPAT */ diff --git a/arch/arm64/include/asm/ftrace.h b/arch/arm64/include/asm/ftrace.h index 91fa4baa1a93..f41aad92c67a 100644 --- a/arch/arm64/include/asm/ftrace.h +++ b/arch/arm64/include/asm/ftrace.h @@ -88,7 +88,7 @@ int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); #define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs) { - return is_compat_task(); + return in_compat_syscall(); } #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME diff --git a/arch/arm64/include/asm/syscall.h b/arch/arm64/include/asm/syscall.h index cfc0672013f6..0dfc01ea386c 100644 --- a/arch/arm64/include/asm/syscall.h +++ b/arch/arm64/include/asm/syscall.h @@ -35,7 +35,7 @@ static inline long syscall_get_error(struct task_struct *task, { unsigned long error = regs->regs[0]; - if (is_compat_thread(task_thread_info(task))) + if (thread_in_compat_syscall(task_thread_info(task))) error = sign_extend64(error, 31); return IS_ERR_VALUE(error) ? error : 0; @@ -54,7 +54,7 @@ static inline void syscall_set_return_value(struct task_struct *task, if (error) val = error; - if (is_compat_thread(task_thread_info(task))) + if (thread_in_compat_syscall(task_thread_info(task))) val = lower_32_bits(val); regs->regs[0] = val; @@ -88,7 +88,7 @@ static inline void syscall_set_arguments(struct task_struct *task, */ static inline int syscall_get_arch(struct task_struct *task) { - if (is_compat_thread(task_thread_info(task))) + if (thread_in_compat_syscall(task_thread_info(task))) return AUDIT_ARCH_ARM; return AUDIT_ARCH_AARCH64; diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index 170f42fd6101..017a82b24f49 100644 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -1721,7 +1721,7 @@ const struct user_regset_view *task_user_regset_view(struct task_struct *task) * 32-bit children use an extended user_aarch32_ptrace_view to allow * access to the TLS register. */ - if (is_compat_task()) + if (in_compat_syscall()) return &user_aarch32_view; else if (is_compat_thread(task_thread_info(task))) return &user_aarch32_ptrace_view; diff --git a/arch/arm64/kernel/syscall.c b/arch/arm64/kernel/syscall.c index b9cf12b271d7..e0e9d54de0a2 100644 --- a/arch/arm64/kernel/syscall.c +++ b/arch/arm64/kernel/syscall.c @@ -51,7 +51,7 @@ static void invoke_syscall(struct pt_regs *regs, unsigned int scno, ret = do_ni_syscall(regs, scno); } - if (is_compat_task()) + if (in_compat_syscall()) ret = lower_32_bits(ret); regs->regs[0] = ret; -- 2.31.1
WARNING: multiple messages have this Message-ID (diff)
From: Amanieu d'Antras <amanieu@gmail.com> Cc: Amanieu d'Antras <amanieu@gmail.com>, Ryan Houdek <Houdek.Ryan@fex-emu.org>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Mark Rutland <mark.rutland@arm.com>, Steven Price <steven.price@arm.com>, Arnd Bergmann <arnd@kernel.org>, David Laight <David.Laight@aculab.com>, Mark Brown <broonie@kernel.org>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [RESEND PATCH v4 4/8] arm64: Separate in_compat_syscall from is_compat_task Date: Tue, 18 May 2021 10:06:54 +0100 [thread overview] Message-ID: <20210518090658.9519-5-amanieu@gmail.com> (raw) In-Reply-To: <20210518090658.9519-1-amanieu@gmail.com> This is preliminary work for allowing 64-bit processes to invoke compat syscalls. Signed-off-by: Amanieu d'Antras <amanieu@gmail.com> Co-developed-by: Ryan Houdek <Houdek.Ryan@fex-emu.org> Signed-off-by: Ryan Houdek <Houdek.Ryan@fex-emu.org> --- arch/arm64/include/asm/compat.h | 24 ++++++++++++++++++++---- arch/arm64/include/asm/ftrace.h | 2 +- arch/arm64/include/asm/syscall.h | 6 +++--- arch/arm64/kernel/ptrace.c | 2 +- arch/arm64/kernel/syscall.c | 2 +- 5 files changed, 26 insertions(+), 10 deletions(-) diff --git a/arch/arm64/include/asm/compat.h b/arch/arm64/include/asm/compat.h index 23a9fb73c04f..a2f5001f7793 100644 --- a/arch/arm64/include/asm/compat.h +++ b/arch/arm64/include/asm/compat.h @@ -178,21 +178,37 @@ struct compat_shmid64_ds { compat_ulong_t __unused5; }; -static inline int is_compat_task(void) +static inline bool is_compat_task(void) { return test_thread_flag(TIF_32BIT); } -static inline int is_compat_thread(struct thread_info *thread) +static inline bool is_compat_thread(struct thread_info *thread) { return test_ti_thread_flag(thread, TIF_32BIT); } +static inline bool in_compat_syscall(void) +{ + return is_compat_task(); +} +#define in_compat_syscall in_compat_syscall /* override the generic impl */ + +static inline bool thread_in_compat_syscall(struct thread_info *thread) +{ + return is_compat_thread(thread); +} + #else /* !CONFIG_COMPAT */ -static inline int is_compat_thread(struct thread_info *thread) +static inline bool is_compat_thread(struct thread_info *thread) +{ + return false; +} + +static inline bool thread_in_compat_syscall(struct thread_info *thread) { - return 0; + return false; } #endif /* CONFIG_COMPAT */ diff --git a/arch/arm64/include/asm/ftrace.h b/arch/arm64/include/asm/ftrace.h index 91fa4baa1a93..f41aad92c67a 100644 --- a/arch/arm64/include/asm/ftrace.h +++ b/arch/arm64/include/asm/ftrace.h @@ -88,7 +88,7 @@ int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); #define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs) { - return is_compat_task(); + return in_compat_syscall(); } #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME diff --git a/arch/arm64/include/asm/syscall.h b/arch/arm64/include/asm/syscall.h index cfc0672013f6..0dfc01ea386c 100644 --- a/arch/arm64/include/asm/syscall.h +++ b/arch/arm64/include/asm/syscall.h @@ -35,7 +35,7 @@ static inline long syscall_get_error(struct task_struct *task, { unsigned long error = regs->regs[0]; - if (is_compat_thread(task_thread_info(task))) + if (thread_in_compat_syscall(task_thread_info(task))) error = sign_extend64(error, 31); return IS_ERR_VALUE(error) ? error : 0; @@ -54,7 +54,7 @@ static inline void syscall_set_return_value(struct task_struct *task, if (error) val = error; - if (is_compat_thread(task_thread_info(task))) + if (thread_in_compat_syscall(task_thread_info(task))) val = lower_32_bits(val); regs->regs[0] = val; @@ -88,7 +88,7 @@ static inline void syscall_set_arguments(struct task_struct *task, */ static inline int syscall_get_arch(struct task_struct *task) { - if (is_compat_thread(task_thread_info(task))) + if (thread_in_compat_syscall(task_thread_info(task))) return AUDIT_ARCH_ARM; return AUDIT_ARCH_AARCH64; diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index 170f42fd6101..017a82b24f49 100644 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -1721,7 +1721,7 @@ const struct user_regset_view *task_user_regset_view(struct task_struct *task) * 32-bit children use an extended user_aarch32_ptrace_view to allow * access to the TLS register. */ - if (is_compat_task()) + if (in_compat_syscall()) return &user_aarch32_view; else if (is_compat_thread(task_thread_info(task))) return &user_aarch32_ptrace_view; diff --git a/arch/arm64/kernel/syscall.c b/arch/arm64/kernel/syscall.c index b9cf12b271d7..e0e9d54de0a2 100644 --- a/arch/arm64/kernel/syscall.c +++ b/arch/arm64/kernel/syscall.c @@ -51,7 +51,7 @@ static void invoke_syscall(struct pt_regs *regs, unsigned int scno, ret = do_ni_syscall(regs, scno); } - if (is_compat_task()) + if (in_compat_syscall()) ret = lower_32_bits(ret); regs->regs[0] = ret; -- 2.31.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-05-18 9:08 UTC|newest] Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-05-18 9:06 [RESEND PATCH v4 0/8] arm64: Allow 64-bit tasks to invoke compat syscalls Amanieu d'Antras 2021-05-18 9:06 ` Amanieu d'Antras 2021-05-18 9:06 ` [RESEND PATCH v4 1/8] mm: Add arch_get_mmap_base_topdown macro Amanieu d'Antras 2021-05-18 9:06 ` Amanieu d'Antras 2021-05-18 9:06 ` [RESEND PATCH v4 2/8] hugetlbfs: Use arch_get_mmap_* macros Amanieu d'Antras 2021-05-18 9:06 ` Amanieu d'Antras 2021-05-18 9:06 ` [RESEND PATCH v4 3/8] mm: Support mmap_compat_base with the generic layout Amanieu d'Antras 2021-05-18 9:06 ` Amanieu d'Antras 2021-05-18 9:06 ` Amanieu d'Antras [this message] 2021-05-18 9:06 ` [RESEND PATCH v4 4/8] arm64: Separate in_compat_syscall from is_compat_task Amanieu d'Antras 2021-05-18 9:06 ` [RESEND PATCH v4 5/8] arm64: mm: Use HAVE_ARCH_COMPAT_MMAP_BASES Amanieu d'Antras 2021-05-18 9:06 ` Amanieu d'Antras 2021-05-18 9:06 ` [RESEND PATCH v4 6/8] arm64: Add a compat syscall flag to thread_info Amanieu d'Antras 2021-05-18 9:06 ` Amanieu d'Antras 2021-05-18 9:06 ` [RESEND PATCH v4 7/8] arm64: Forbid calling compat sigreturn from 64-bit tasks Amanieu d'Antras 2021-05-18 9:06 ` Amanieu d'Antras 2021-05-18 9:06 ` [RESEND PATCH v4 8/8] arm64: Allow 64-bit tasks to invoke compat syscalls Amanieu d'Antras 2021-05-18 9:06 ` Amanieu d'Antras 2021-05-18 13:02 ` Arnd Bergmann 2021-05-18 13:02 ` Arnd Bergmann 2021-05-18 20:26 ` David Laight 2021-05-18 20:26 ` David Laight 2021-05-18 22:41 ` Ryan Houdek 2021-05-18 22:41 ` Ryan Houdek 2021-05-18 23:51 ` Amanieu d'Antras 2021-05-18 23:51 ` Amanieu d'Antras 2021-05-19 15:30 ` Steven Price 2021-05-19 15:30 ` Steven Price 2021-05-19 16:14 ` Amanieu d'Antras 2021-05-19 16:14 ` Amanieu d'Antras 2021-05-21 8:51 ` Steven Price 2021-05-21 8:51 ` Steven Price 2021-05-21 19:18 ` Amanieu d'Antras 2021-05-21 19:18 ` Amanieu d'Antras 2021-05-24 11:20 ` Steven Price 2021-05-24 11:20 ` Steven Price 2021-05-24 12:38 ` David Laight 2021-05-24 12:38 ` David Laight 2021-05-18 23:52 ` Ryan Houdek 2021-05-18 23:52 ` Ryan Houdek
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