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| author | Gregory Price <gourry.memverge@gmail.com> | 2023-04-07 13:18:33 -0400 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2023-04-16 14:23:07 +0200 |
| commit | 3f67987cdc09778e75098f9f5168832f8f8e1f1c (patch) | |
| tree | 48648bbc78fee9bc257739aff7f79031071ae0e8 /kernel/entry | |
| parent | 463b7715e7ce367fce89769c5d85e31595715ee1 (diff) | |
| download | linux-3f67987cdc09778e75098f9f5168832f8f8e1f1c.tar.gz linux-3f67987cdc09778e75098f9f5168832f8f8e1f1c.tar.bz2 linux-3f67987cdc09778e75098f9f5168832f8f8e1f1c.zip | |
ptrace: Provide set/get interface for syscall user dispatch
The syscall user dispatch configuration can only be set by the task itself,
but lacks a ptrace set/get interface which makes it impossible to implement
checkpoint/restore for it.
Add the required ptrace requests and the get/set functions in the syscall
user dispatch code to make that possible.
Signed-off-by: Gregory Price <gregory.price@memverge.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Link: https://lore.kernel.org/r/20230407171834.3558-4-gregory.price@memverge.com
Diffstat (limited to 'kernel/entry')
| -rw-r--r-- | kernel/entry/syscall_user_dispatch.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/kernel/entry/syscall_user_dispatch.c b/kernel/entry/syscall_user_dispatch.c index 7f2add43672d..5340c5aa89e7 100644 --- a/kernel/entry/syscall_user_dispatch.c +++ b/kernel/entry/syscall_user_dispatch.c @@ -4,6 +4,7 @@ */ #include <linux/sched.h> #include <linux/prctl.h> +#include <linux/ptrace.h> #include <linux/syscall_user_dispatch.h> #include <linux/uaccess.h> #include <linux/signal.h> @@ -122,3 +123,42 @@ int set_syscall_user_dispatch(unsigned long mode, unsigned long offset, { return task_set_syscall_user_dispatch(current, mode, offset, len, selector); } + +int syscall_user_dispatch_get_config(struct task_struct *task, unsigned long size, + void __user *data) +{ + struct syscall_user_dispatch *sd = &task->syscall_dispatch; + struct ptrace_sud_config cfg; + + if (size != sizeof(cfg)) + return -EINVAL; + + if (test_task_syscall_work(task, SYSCALL_USER_DISPATCH)) + cfg.mode = PR_SYS_DISPATCH_ON; + else + cfg.mode = PR_SYS_DISPATCH_OFF; + + cfg.offset = sd->offset; + cfg.len = sd->len; + cfg.selector = (__u64)(uintptr_t)sd->selector; + + if (copy_to_user(data, &cfg, sizeof(cfg))) + return -EFAULT; + + return 0; +} + +int syscall_user_dispatch_set_config(struct task_struct *task, unsigned long size, + void __user *data) +{ + struct ptrace_sud_config cfg; + + if (size != sizeof(cfg)) + return -EINVAL; + + if (copy_from_user(&cfg, data, sizeof(cfg))) + return -EFAULT; + + return task_set_syscall_user_dispatch(task, cfg.mode, cfg.offset, cfg.len, + (char __user *)(uintptr_t)cfg.selector); +} |