#include #include #include #include static int collect_syscall(struct task_struct *target, long *callno, unsigned long args[6], unsigned int maxargs, unsigned long *sp, unsigned long *pc) { struct pt_regs *regs; if (!try_get_task_stack(target)) { /* Task has no stack, so the task isn't in a syscall. */ *callno = -1; return 0; } regs = task_pt_regs(target); if (unlikely(!regs)) { put_task_stack(target); return -EAGAIN; } *sp = user_stack_pointer(regs); *pc = instruction_pointer(regs); *callno = syscall_get_nr(target, regs); if (*callno != -1L && maxargs > 0) syscall_get_arguments(target, regs, 0, maxargs, args); put_task_stack(target); return 0; } /** * task_current_syscall - Discover what a blocked task is doing. * @target: thread to examine * @callno: filled with system call number or -1 * @args: filled with @maxargs system call arguments * @maxargs: number of elements in @args to fill * @sp: filled with user stack pointer * @pc: filled with user PC * * If @target is blocked in a system call, returns zero with *@callno * set to the the call's number and @args filled in with its arguments. * Registers not used for system call arguments may not be available and * it is not kosher to use &struct user_regset calls while the system * call is still in progress. Note we may get this result if @target * has finished its system call but not yet returned to user mode, such * as when it's stopped for signal handling or syscall exit tracing. * * If @target is blocked in the kernel during a fault or exception, * returns zero with *@callno set to -1 and does not fill in @args. * If so, it's now safe to examine @target using &struct user_regset * get() calls as long as we're sure @target won't return to user mode. * * Returns -%EAGAIN if @target does not remain blocked. * * Returns -%EINVAL if @maxargs is too large (maximum is six). */ int task_current_syscall(struct task_struct *target, long *callno, unsigned long args[6], unsigned int maxargs, unsigned long *sp, unsigned long *pc) { long state; unsigned long ncsw; if (unlikely(maxargs > 6)) return -EINVAL; if (target == current) return collect_syscall(target, callno, args, maxargs, sp, pc); state = target->state; if (unlikely(!state)) return -EAGAIN; ncsw = wait_task_inactive(target, state); if (unlikely(!ncsw) || unlikely(collect_syscall(target, callno, args, maxargs, sp, pc)) || unlikely(wait_task_inactive(target, state) != ncsw)) return -EAGAIN; return 0; } t' value='search'/>

Age	Commit message (Expand)	Author	Files	Lines
2017-02-12	netfilter: nf_ct_sip: Use mod_timer_pending()	Gao Feng	1	-7/+5
2017-02-08	netfilter: nft_exthdr: add TCP option matching	Manuel Messner	3	-16/+124
2017-02-08	netfilter: nft_ct: add zone id set support	Florian Westphal	1	-1/+143
2017-02-08	netfilter: nft_ct: prepare for key-dependent error unwind	Florian Westphal	1	-14/+15
2017-02-08	netfilter: nft_ct: add zone id get support	Florian Westphal	2	-3/+21
2017-02-08	netfilter: nf_tables: add bitmap set type	Pablo Neira Ayuso	3	-0/+321
2017-02-08	netfilter: nf_tables: add space notation to sets	Pablo Neira Ayuso	4	-5/+21
2017-02-08	netfilter: nf_tables: rename struct nft_set_estimate class field	Pablo Neira Ayuso	4	-10/+10
2017-02-08	netfilter: nf_tables: add flush field to struct nft_set_iter	Pablo Neira Ayuso	2	-0/+5
2017-02-08	netfilter: nf_tables: rename deactivate_one() to flush()	Pablo Neira Ayuso	4	-13/+13
2017-02-08	netfilter: nf_tables: use struct nft_set_iter in set element flush	Pablo Neira Ayuso	1	-7/+5
2017-02-08	netfilter: nf_tables: pass netns to set->ops->remove()	Pablo Neira Ayuso	4	-6/+9
2017-02-08	netfilter: nft_exthdr: Add support for existence check	Phil Sutter	2	-2/+26
2017-02-03	net: skb_needs_check() accepts CHECKSUM_NONE for tx	Eric Dumazet	1	-3/+4
2017-02-03	net: remove support for per driver ndo_busy_poll()	Eric Dumazet	4	-21/+0
2017-02-03	enic: Remove local ndo_busy_poll() implementation.	David S. Miller