From: Christian Brauner Date: Mon, 8 Jun 2020 15:28:50 +0000 (+0200) Subject: fork: fold legacy_clone_args_valid() into _do_fork() X-Git-Tag: v5.15~3226^2~16 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3af8588c77186bf08e55e7281da83d88373481d7;p=platform%2Fkernel%2Flinux-starfive.git fork: fold legacy_clone_args_valid() into _do_fork() This separate helper only existed to guarantee the mutual exclusivity of CLONE_PIDFD and CLONE_PARENT_SETTID for legacy clone since CLONE_PIDFD abuses the parent_tid field to return the pidfd. But we can actually handle this uniformely thus removing the helper. For legacy clone we can detect that CLONE_PIDFD is specified in conjunction with CLONE_PARENT_SETTID because they will share the same memory which is invalid and for clone3() setting the separate pidfd and parent_tid fields to the same memory is bogus as well. So fold that helper directly into _do_fork() by detecting this case. Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Al Viro Cc: Geert Uytterhoeven Cc: "Matthew Wilcox (Oracle)" Cc: "Peter Zijlstra (Intel)" Cc: linux-m68k@lists.linux-m68k.org Cc: x86@kernel.org Signed-off-by: Christian Brauner --- diff --git a/arch/m68k/kernel/process.c b/arch/m68k/kernel/process.c index 90ae376..0608439 100644 --- a/arch/m68k/kernel/process.c +++ b/arch/m68k/kernel/process.c @@ -125,9 +125,6 @@ asmlinkage int m68k_clone(struct pt_regs *regs) .tls = regs->d5, }; - if (!legacy_clone_args_valid(&args)) - return -EINVAL; - return _do_fork(&args); } diff --git a/arch/x86/kernel/sys_ia32.c b/arch/x86/kernel/sys_ia32.c index f8d65c9..720cde8 100644 --- a/arch/x86/kernel/sys_ia32.c +++ b/arch/x86/kernel/sys_ia32.c @@ -251,9 +251,6 @@ COMPAT_SYSCALL_DEFINE5(ia32_clone, unsigned long, clone_flags, .tls = tls_val, }; - if (!legacy_clone_args_valid(&args)) - return -EINVAL; - return _do_fork(&args); } #endif /* CONFIG_IA32_EMULATION */ diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h index 3835907..ddce0ea 100644 --- a/include/linux/sched/task.h +++ b/include/linux/sched/task.h @@ -96,7 +96,6 @@ extern void exit_files(struct task_struct *); extern void exit_itimers(struct signal_struct *); extern long _do_fork(struct kernel_clone_args *kargs); -extern bool legacy_clone_args_valid(const struct kernel_clone_args *kargs); extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *); struct task_struct *fork_idle(int); struct mm_struct *copy_init_mm(void); diff --git a/kernel/fork.c b/kernel/fork.c index 142b236..9875aeb 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2423,6 +2423,20 @@ long _do_fork(struct kernel_clone_args *args) long nr; /* + * For legacy clone() calls, CLONE_PIDFD uses the parent_tid argument + * to return the pidfd. Hence, CLONE_PIDFD and CLONE_PARENT_SETTID are + * mutually exclusive. With clone3() CLONE_PIDFD has grown a separate + * field in struct clone_args and it still doesn't make sense to have + * them both point at the same memory location. Performing this check + * here has the advantage that we don't need to have a separate helper + * to check for legacy clone(). + */ + if ((args->flags & CLONE_PIDFD) && + (args->flags & CLONE_PARENT_SETTID) && + (args->pidfd == args->parent_tid)) + return -EINVAL; + + /* * Determine whether and which event to report to ptracer. When * called from kernel_thread or CLONE_UNTRACED is explicitly * requested, no event is reported; otherwise, report if the event @@ -2479,16 +2493,6 @@ long _do_fork(struct kernel_clone_args *args) return nr; } -bool legacy_clone_args_valid(const struct kernel_clone_args *kargs) -{ - /* clone(CLONE_PIDFD) uses parent_tidptr to return a pidfd */ - if ((kargs->flags & CLONE_PIDFD) && - (kargs->flags & CLONE_PARENT_SETTID)) - return false; - - return true; -} - #ifndef CONFIG_HAVE_COPY_THREAD_TLS /* For compatibility with architectures that call do_fork directly rather than * using the syscall entry points below. */ @@ -2508,9 +2512,6 @@ long do_fork(unsigned long clone_flags, .stack_size = stack_size, }; - if (!legacy_clone_args_valid(&args)) - return -EINVAL; - return _do_fork(&args); } #endif @@ -2593,9 +2594,6 @@ SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp, .tls = tls, }; - if (!legacy_clone_args_valid(&args)) - return -EINVAL; - return _do_fork(&args); } #endif