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Miller" , Andreas Larsson , Christian Brauner , Mark Rutland , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, loongarch@lists.linux.dev, linux-openrisc@vger.kernel.org, linux-riscv@lists.infradead.org Subject: [PATCH 07/17] clone3: drop __ARCH_WANT_SYS_CLONE3 macro Date: Thu, 4 Jul 2024 16:36:01 +0200 Message-Id: <20240704143611.2979589-8-arnd@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240704143611.2979589-1-arnd@kernel.org> References: <20240704143611.2979589-1-arnd@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240704_073737_087923_F55B644A X-CRM114-Status: GOOD ( 17.93 ) X-Spam-Score: -5.2 (-----) X-Spam-Report: Spam detection software, running on the system "bombadil.infradead.org", has NOT identified this incoming email as spam. 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Content preview: From: Arnd Bergmann When clone3() was introduced, it was not obvious how each architecture deals with setting up the stack and keeping the register contents in a fork()-like system call, so this was left for the architec [...] Content analysis details: (-5.2 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [139.178.84.217 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.0 DKIMWL_WL_HIGH DKIMwl.org - High trust sender X-BeenThere: linux-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org From: Arnd Bergmann When clone3() was introduced, it was not obvious how each architecture deals with setting up the stack and keeping the register contents in a fork()-like system call, so this was left for the architecture maintainers to implement, with __ARCH_WANT_SYS_CLONE3 defined by those that already implement it. Five years later, we still have a few architectures left that are missing clone3(), and the macro keeps getting in the way as it's fundamentally different from all the other __ARCH_WANT_SYS_* macros that are meant to provide backwards-compatibility with applications using older syscalls that are no longer provided by default. Address this by reversing the polarity of the macro, adding an __ARCH_BROKEN_SYS_CLONE3 macro to all architectures that don't already provide the syscall, and remove __ARCH_WANT_SYS_CLONE3 from all the other ones. Signed-off-by: Arnd Bergmann Acked-by: Geert Uytterhoeven --- arch/arc/include/uapi/asm/unistd.h | 1 - arch/arm/include/asm/unistd.h | 1 - arch/arm64/include/uapi/asm/unistd.h | 1 - arch/csky/include/uapi/asm/unistd.h | 1 - arch/hexagon/include/uapi/asm/unistd.h | 2 ++ arch/loongarch/include/uapi/asm/unistd.h | 1 - arch/m68k/include/asm/unistd.h | 1 - arch/mips/include/asm/unistd.h | 1 - arch/nios2/include/uapi/asm/unistd.h | 2 ++ arch/openrisc/include/uapi/asm/unistd.h | 1 - arch/parisc/include/asm/unistd.h | 1 - arch/powerpc/include/asm/unistd.h | 1 - arch/riscv/include/uapi/asm/unistd.h | 1 - arch/s390/include/asm/unistd.h | 1 - arch/sh/include/asm/unistd.h | 2 ++ arch/sparc/include/asm/unistd.h | 2 ++ arch/x86/include/asm/unistd.h | 1 - arch/xtensa/include/asm/unistd.h | 1 - include/uapi/asm-generic/unistd.h | 4 ---- kernel/fork.c | 8 +++++--- kernel/sys_ni.c | 2 -- tools/arch/arm64/include/uapi/asm/unistd.h | 1 - tools/arch/loongarch/include/uapi/asm/unistd.h | 1 - tools/include/uapi/asm-generic/unistd.h | 4 ---- 24 files changed, 13 insertions(+), 29 deletions(-) diff --git a/arch/arc/include/uapi/asm/unistd.h b/arch/arc/include/uapi/asm/unistd.h index fa2713ae6bea..5eafa1115162 100644 --- a/arch/arc/include/uapi/asm/unistd.h +++ b/arch/arc/include/uapi/asm/unistd.h @@ -21,7 +21,6 @@ #define __ARCH_WANT_SET_GET_RLIMIT #define __ARCH_WANT_SYS_EXECVE #define __ARCH_WANT_SYS_CLONE -#define __ARCH_WANT_SYS_CLONE3 #define __ARCH_WANT_SYS_VFORK #define __ARCH_WANT_SYS_FORK #define __ARCH_WANT_TIME32_SYSCALLS diff --git a/arch/arm/include/asm/unistd.h b/arch/arm/include/asm/unistd.h index 3676e82cf95c..9fb00973c608 100644 --- a/arch/arm/include/asm/unistd.h +++ b/arch/arm/include/asm/unistd.h @@ -37,7 +37,6 @@ #define __ARCH_WANT_SYS_FORK #define __ARCH_WANT_SYS_VFORK #define __ARCH_WANT_SYS_CLONE -#define __ARCH_WANT_SYS_CLONE3 /* * Unimplemented (or alternatively implemented) syscalls diff --git a/arch/arm64/include/uapi/asm/unistd.h b/arch/arm64/include/uapi/asm/unistd.h index ce2ee8f1e361..9306726337fe 100644 --- a/arch/arm64/include/uapi/asm/unistd.h +++ b/arch/arm64/include/uapi/asm/unistd.h @@ -19,7 +19,6 @@ #define __ARCH_WANT_NEW_STAT #define __ARCH_WANT_SET_GET_RLIMIT #define __ARCH_WANT_TIME32_SYSCALLS -#define __ARCH_WANT_SYS_CLONE3 #define __ARCH_WANT_MEMFD_SECRET #include diff --git a/arch/csky/include/uapi/asm/unistd.h b/arch/csky/include/uapi/asm/unistd.h index e0594b6370a6..d529d0432876 100644 --- a/arch/csky/include/uapi/asm/unistd.h +++ b/arch/csky/include/uapi/asm/unistd.h @@ -3,7 +3,6 @@ #define __ARCH_WANT_STAT64 #define __ARCH_WANT_NEW_STAT #define __ARCH_WANT_SYS_CLONE -#define __ARCH_WANT_SYS_CLONE3 #define __ARCH_WANT_SET_GET_RLIMIT #define __ARCH_WANT_TIME32_SYSCALLS #define __ARCH_WANT_SYNC_FILE_RANGE2 diff --git a/arch/hexagon/include/uapi/asm/unistd.h b/arch/hexagon/include/uapi/asm/unistd.h index 21ae22306b5d..4bea7428e747 100644 --- a/arch/hexagon/include/uapi/asm/unistd.h +++ b/arch/hexagon/include/uapi/asm/unistd.h @@ -38,4 +38,6 @@ #define __ARCH_WANT_TIME32_SYSCALLS #define __ARCH_WANT_SYNC_FILE_RANGE2 +#define __ARCH_BROKEN_SYS_CLONE3 + #include diff --git a/arch/loongarch/include/uapi/asm/unistd.h b/arch/loongarch/include/uapi/asm/unistd.h index fcb668984f03..191614b9b207 100644 --- a/arch/loongarch/include/uapi/asm/unistd.h +++ b/arch/loongarch/include/uapi/asm/unistd.h @@ -1,5 +1,4 @@ /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #define __ARCH_WANT_SYS_CLONE -#define __ARCH_WANT_SYS_CLONE3 #include diff --git a/arch/m68k/include/asm/unistd.h b/arch/m68k/include/asm/unistd.h index 4ae52414cd9d..2e0047cf86f8 100644 --- a/arch/m68k/include/asm/unistd.h +++ b/arch/m68k/include/asm/unistd.h @@ -30,6 +30,5 @@ #define __ARCH_WANT_SYS_SIGPROCMASK #define __ARCH_WANT_SYS_FORK #define __ARCH_WANT_SYS_VFORK -#define __ARCH_WANT_SYS_CLONE3 #endif /* _ASM_M68K_UNISTD_H_ */ diff --git a/arch/mips/include/asm/unistd.h b/arch/mips/include/asm/unistd.h index 25a5253db7f4..ba83d3fb0a84 100644 --- a/arch/mips/include/asm/unistd.h +++ b/arch/mips/include/asm/unistd.h @@ -58,7 +58,6 @@ # endif #define __ARCH_WANT_SYS_FORK #define __ARCH_WANT_SYS_CLONE -#define __ARCH_WANT_SYS_CLONE3 /* whitelists for checksyscalls */ #define __IGNORE_fadvise64_64 diff --git a/arch/nios2/include/uapi/asm/unistd.h b/arch/nios2/include/uapi/asm/unistd.h index 0b4bb1d41b28..d2bc5ac975fb 100644 --- a/arch/nios2/include/uapi/asm/unistd.h +++ b/arch/nios2/include/uapi/asm/unistd.h @@ -23,6 +23,8 @@ #define __ARCH_WANT_SET_GET_RLIMIT #define __ARCH_WANT_TIME32_SYSCALLS +#define __ARCH_BROKEN_SYS_CLONE3 + /* Use the standard ABI for syscalls */ #include diff --git a/arch/openrisc/include/uapi/asm/unistd.h b/arch/openrisc/include/uapi/asm/unistd.h index fae34c60fa88..566f8c4f8047 100644 --- a/arch/openrisc/include/uapi/asm/unistd.h +++ b/arch/openrisc/include/uapi/asm/unistd.h @@ -24,7 +24,6 @@ #define __ARCH_WANT_SET_GET_RLIMIT #define __ARCH_WANT_SYS_FORK #define __ARCH_WANT_SYS_CLONE -#define __ARCH_WANT_SYS_CLONE3 #define __ARCH_WANT_TIME32_SYSCALLS #include diff --git a/arch/parisc/include/asm/unistd.h b/arch/parisc/include/asm/unistd.h index e38f9a90ac15..98851ff7699a 100644 --- a/arch/parisc/include/asm/unistd.h +++ b/arch/parisc/include/asm/unistd.h @@ -160,7 +160,6 @@ type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5) \ #define __ARCH_WANT_SYS_FORK #define __ARCH_WANT_SYS_VFORK #define __ARCH_WANT_SYS_CLONE -#define __ARCH_WANT_SYS_CLONE3 #define __ARCH_WANT_COMPAT_SYS_SENDFILE #define __ARCH_WANT_COMPAT_STAT diff --git a/arch/powerpc/include/asm/unistd.h b/arch/powerpc/include/asm/unistd.h index 659a996c75aa..027ef94a12fb 100644 --- a/arch/powerpc/include/asm/unistd.h +++ b/arch/powerpc/include/asm/unistd.h @@ -51,7 +51,6 @@ #define __ARCH_WANT_SYS_FORK #define __ARCH_WANT_SYS_VFORK #define __ARCH_WANT_SYS_CLONE -#define __ARCH_WANT_SYS_CLONE3 #endif /* __ASSEMBLY__ */ #endif /* _ASM_POWERPC_UNISTD_H_ */ diff --git a/arch/riscv/include/uapi/asm/unistd.h b/arch/riscv/include/uapi/asm/unistd.h index 950ab3fd4409..328520defc13 100644 --- a/arch/riscv/include/uapi/asm/unistd.h +++ b/arch/riscv/include/uapi/asm/unistd.h @@ -20,7 +20,6 @@ #define __ARCH_WANT_SET_GET_RLIMIT #endif /* __LP64__ */ -#define __ARCH_WANT_SYS_CLONE3 #define __ARCH_WANT_MEMFD_SECRET #include diff --git a/arch/s390/include/asm/unistd.h b/arch/s390/include/asm/unistd.h index 4260bc5ce7f8..70fc671397da 100644 --- a/arch/s390/include/asm/unistd.h +++ b/arch/s390/include/asm/unistd.h @@ -35,6 +35,5 @@ #define __ARCH_WANT_SYS_FORK #define __ARCH_WANT_SYS_VFORK #define __ARCH_WANT_SYS_CLONE -#define __ARCH_WANT_SYS_CLONE3 #endif /* _ASM_S390_UNISTD_H_ */ diff --git a/arch/sh/include/asm/unistd.h b/arch/sh/include/asm/unistd.h index d6e126250136..3d7f35650a13 100644 --- a/arch/sh/include/asm/unistd.h +++ b/arch/sh/include/asm/unistd.h @@ -28,4 +28,6 @@ # define __ARCH_WANT_SYS_VFORK # define __ARCH_WANT_SYS_CLONE +#define __ARCH_BROKEN_SYS_CLONE3 + #include diff --git a/arch/sparc/include/asm/unistd.h b/arch/sparc/include/asm/unistd.h index d6bc76706a7a..3380411a4537 100644 --- a/arch/sparc/include/asm/unistd.h +++ b/arch/sparc/include/asm/unistd.h @@ -49,6 +49,8 @@ #define __ARCH_WANT_COMPAT_STAT #endif +#define __ARCH_BROKEN_SYS_CLONE3 + #ifdef __32bit_syscall_numbers__ /* Sparc 32-bit only has the "setresuid32", "getresuid32" variants, * it never had the plain ones and there is no value to adding those diff --git a/arch/x86/include/asm/unistd.h b/arch/x86/include/asm/unistd.h index 761173ccc33c..6c9e5bdd3916 100644 --- a/arch/x86/include/asm/unistd.h +++ b/arch/x86/include/asm/unistd.h @@ -56,6 +56,5 @@ # define __ARCH_WANT_SYS_FORK # define __ARCH_WANT_SYS_VFORK # define __ARCH_WANT_SYS_CLONE -# define __ARCH_WANT_SYS_CLONE3 #endif /* _ASM_X86_UNISTD_H */ diff --git a/arch/xtensa/include/asm/unistd.h b/arch/xtensa/include/asm/unistd.h index b52236245e51..30af4dc3ce7b 100644 --- a/arch/xtensa/include/asm/unistd.h +++ b/arch/xtensa/include/asm/unistd.h @@ -3,7 +3,6 @@ #define _XTENSA_UNISTD_H #define __ARCH_WANT_SYS_CLONE -#define __ARCH_WANT_SYS_CLONE3 #include #define __ARCH_WANT_NEW_STAT diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h index d4cc26932ff4..5bf6148cac2b 100644 --- a/include/uapi/asm-generic/unistd.h +++ b/include/uapi/asm-generic/unistd.h @@ -776,12 +776,8 @@ __SYSCALL(__NR_fsmount, sys_fsmount) __SYSCALL(__NR_fspick, sys_fspick) #define __NR_pidfd_open 434 __SYSCALL(__NR_pidfd_open, sys_pidfd_open) - -#ifdef __ARCH_WANT_SYS_CLONE3 #define __NR_clone3 435 __SYSCALL(__NR_clone3, sys_clone3) -#endif - #define __NR_close_range 436 __SYSCALL(__NR_close_range, sys_close_range) #define __NR_openat2 437 diff --git a/kernel/fork.c b/kernel/fork.c index 99076dbe27d8..02f322424c49 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2941,8 +2941,6 @@ SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp, } #endif -#ifdef __ARCH_WANT_SYS_CLONE3 - noinline static int copy_clone_args_from_user(struct kernel_clone_args *kargs, struct clone_args __user *uargs, size_t usize) @@ -3086,6 +3084,11 @@ SYSCALL_DEFINE2(clone3, struct clone_args __user *, uargs, size_t, size) struct kernel_clone_args kargs; pid_t set_tid[MAX_PID_NS_LEVEL]; +#ifdef __ARCH_BROKEN_SYS_CLONE3 +#warning clone3() entry point is missing, please fix + return -ENOSYS; +#endif + kargs.set_tid = set_tid; err = copy_clone_args_from_user(&kargs, uargs, size); @@ -3097,7 +3100,6 @@ SYSCALL_DEFINE2(clone3, struct clone_args __user *, uargs, size_t, size) return kernel_clone(&kargs); } -#endif void walk_process_tree(struct task_struct *top, proc_visitor visitor, void *data) { diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c index b696b85ac63e..2ef820a2d067 100644 --- a/kernel/sys_ni.c +++ b/kernel/sys_ni.c @@ -76,8 +76,6 @@ COND_SYSCALL(timerfd_gettime32); COND_SYSCALL(acct); COND_SYSCALL(capget); COND_SYSCALL(capset); -/* __ARCH_WANT_SYS_CLONE3 */ -COND_SYSCALL(clone3); COND_SYSCALL(futex); COND_SYSCALL(futex_time32); COND_SYSCALL(set_robust_list); diff --git a/tools/arch/arm64/include/uapi/asm/unistd.h b/tools/arch/arm64/include/uapi/asm/unistd.h index ce2ee8f1e361..9306726337fe 100644 --- a/tools/arch/arm64/include/uapi/asm/unistd.h +++ b/tools/arch/arm64/include/uapi/asm/unistd.h @@ -19,7 +19,6 @@ #define __ARCH_WANT_NEW_STAT #define __ARCH_WANT_SET_GET_RLIMIT #define __ARCH_WANT_TIME32_SYSCALLS -#define __ARCH_WANT_SYS_CLONE3 #define __ARCH_WANT_MEMFD_SECRET #include diff --git a/tools/arch/loongarch/include/uapi/asm/unistd.h b/tools/arch/loongarch/include/uapi/asm/unistd.h index 0c743344e92d..8eeaac0087c3 100644 --- a/tools/arch/loongarch/include/uapi/asm/unistd.h +++ b/tools/arch/loongarch/include/uapi/asm/unistd.h @@ -4,6 +4,5 @@ */ #define __ARCH_WANT_SYS_CLONE -#define __ARCH_WANT_SYS_CLONE3 #include diff --git a/tools/include/uapi/asm-generic/unistd.h b/tools/include/uapi/asm-generic/unistd.h index d983c48a3b6a..a00d53d02723 100644 --- a/tools/include/uapi/asm-generic/unistd.h +++ b/tools/include/uapi/asm-generic/unistd.h @@ -776,12 +776,8 @@ __SYSCALL(__NR_fsmount, sys_fsmount) __SYSCALL(__NR_fspick, sys_fspick) #define __NR_pidfd_open 434 __SYSCALL(__NR_pidfd_open, sys_pidfd_open) - -#ifdef __ARCH_WANT_SYS_CLONE3 #define __NR_clone3 435 __SYSCALL(__NR_clone3, sys_clone3) -#endif - #define __NR_close_range 436 __SYSCALL(__NR_close_range, sys_close_range) #define __NR_openat2 437