#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; } s='txt' type='search' size='10' name='q' value=''/>
path: root/net/bridge
AgeCommit message (Expand)AuthorFilesLines
2017-02-10switchdev: bridge: Offload mc router portsNogah Frankel1-0/+15
2017-02-10bridge: mcast: Merge the mc router ports deletions to one functionNogah Frankel1-15/+9
2017-02-10switchdev: bridge: Offload multicast disabledNogah Frankel1-0/+16
2017-02-08bridge: vlan tunnel id info range fill size calc cleanupsRoopa Prabhu1-18/+16
2017-02-07bridge: avoid unnecessary read of jiffiesstephen hemminger2-4/+8
2017-02-07bridge: remove unnecessary check for vtbegin in br_fill_vlan_tinfo_rangeRoopa Prabhu1-1/+1
2017-02-07bridge: tunnel: fix attribute checks in br_parse_vlan_tunnel_infoNikolay Aleksandrov1-4/+4
2017-02-07net: bridge: remove redundant check to see if err is setColin Ian King1-3/+0
2017-02-06bridge: fdb: write to used and updated at most once per jiffyNikolay Aleksandrov2-2/+4
2017-02-06bridge: move write-heavy fdb members in their own cache lineNikolay Aleksandrov1-4/+6
2017-02-06bridge: move to workqueue gcNikolay Aleksandrov10-23/+29
2017-02-06bridge: modify bridge and port to have often accessed fields in one cache lineNikolay Aleksandrov1-23/+20
2017-02-06net: remove ndo_neigh_{construct, destroy} from stacked devicesIdo Schimmel1-2/+0
2017-02-03Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-nextDavid S. Miller3-32/+49
2017-02-03bridge: vlan dst_metadata hooks in ingress and egress pathsRoopa Prabhu6-2/+82
2017-02-03bridge: per vlan dst_metadata netlink supportRoopa Prabhu7-48/+641
2017-02-02netfilter: allow logging from non-init namespacesMichal Kubeček1-1/+1