/* * Functions to manage eBPF programs attached to cgroups * * Copyright (c) 2016 Daniel Mack * * This file is subject to the terms and conditions of version 2 of the GNU * General Public License. See the file COPYING in the main directory of the * Linux distribution for more details. */ #include #include #include #include #include #include #include DEFINE_STATIC_KEY_FALSE(cgroup_bpf_enabled_key); EXPORT_SYMBOL(cgroup_bpf_enabled_key); /** * cgroup_bpf_put() - put references of all bpf programs * @cgrp: the cgroup to modify */ void cgroup_bpf_put(struct cgroup *cgrp) { unsigned int type; for (type = 0; type < ARRAY_SIZE(cgrp->bpf.prog); type++) { struct bpf_prog *prog = cgrp->bpf.prog[type]; if (prog) { bpf_prog_put(prog); static_branch_dec(&cgroup_bpf_enabled_key); } } } /** * cgroup_bpf_inherit() - inherit effective programs from parent * @cgrp: the cgroup to modify * @parent: the parent to inherit from */ void cgroup_bpf_inherit(struct cgroup *cgrp, struct cgroup *parent) { unsigned int type; for (type = 0; type < ARRAY_SIZE(cgrp->bpf.effective); type++) { struct bpf_prog *e; e = rcu_dereference_protected(parent->bpf.effective[type], lockdep_is_held(&cgroup_mutex)); rcu_assign_pointer(cgrp->bpf.effective[type], e); } } /** * __cgroup_bpf_update() - Update the pinned program of a cgroup, and * propagate the change to descendants * @cgrp: The cgroup which descendants to traverse * @parent: The parent of @cgrp, or %NULL if @cgrp is the root * @prog: A new program to pin * @type: Type of pinning operation (ingress/egress) * * Each cgroup has a set of two pointers for bpf programs; one for eBPF * programs it owns, and which is effective for execution. * * If @prog is not %NULL, this function attaches a new program to the cgroup * and releases the one that is currently attached, if any. @prog is then made * the effective program of type @type in that cgroup. * * If @prog is %NULL, the currently attached program of type @type is released, * and the effective program of the parent cgroup (if any) is inherited to * @cgrp. * * Then, the descendants of @cgrp are walked and the effective program for * each of them is set to the effective program of @cgrp unless the * descendant has its own program attached, in which case the subbranch is * skipped. This ensures that delegated subcgroups with own programs are left * untouched. * * Must be called with cgroup_mutex held. */ void __cgroup_bpf_update(struct cgroup *cgrp, struct cgroup *parent, struct bpf_prog *prog, enum bpf_attach_type type) { struct bpf_prog *old_prog, *effective; struct cgroup_subsys_state *pos; old_prog = xchg(cgrp->bpf.prog + type, prog); effective = (!prog && parent) ? rcu_dereference_protected(parent->bpf.effective[type], lockdep_is_held(&cgroup_mutex)) : prog; css_for_each_descendant_pre(pos, &cgrp->self) { struct cgroup *desc = container_of(pos, struct cgroup, self); /* skip the subtree if the descendant has its own program */ if (desc->bpf.prog[type] && desc != cgrp) pos = css_rightmost_descendant(pos); else rcu_assign_pointer(desc->bpf.effective[type], effective); } if (prog) static_branch_inc(&cgroup_bpf_enabled_key); if (old_prog) { bpf_prog_put(old_prog); static_branch_dec(&cgroup_bpf_enabled_key); } } /** * __cgroup_bpf_run_filter_skb() - Run a program for packet filtering * @sk: The socken sending or receiving traffic * @skb: The skb that is being sent or received * @type: The type of program to be exectuted * * If no socket is passed, or the socket is not of type INET or INET6, * this function does nothing and returns 0. * * The program type passed in via @type must be suitable for network * filtering. No further check is performed to assert that. * * This function will return %-EPERM if any if an attached program was found * and if it returned != 1 during execution. In all other cases, 0 is returned. */ int __cgroup_bpf_run_filter_skb(struct sock *sk, struct sk_buff *skb, enum bpf_attach_type type) { struct bpf_prog *prog; struct cgroup *cgrp; int ret = 0; if (!sk || !sk_fullsock(sk)) return 0; if (sk->sk_family != AF_INET && sk->sk_family != AF_INET6) return 0; cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); rcu_read_lock(); prog = rcu_dereference(cgrp->bpf.effective[type]); if (prog) { unsigned int offset = skb->data - skb_network_header(skb); __skb_push(skb, offset); ret = bpf_prog_run_save_cb(prog, skb) == 1 ? 0 : -EPERM; __skb_pull(skb, offset); } rcu_read_unlock(); return ret; } EXPORT_SYMBOL(__cgroup_bpf_run_filter_skb); /** * __cgroup_bpf_run_filter_sk() - Run a program on a sock * @sk: sock structure to manipulate * @type: The type of program to be exectuted * * socket is passed is expected to be of type INET or INET6. * * The program type passed in via @type must be suitable for sock * filtering. No further check is performed to assert that. * * This function will return %-EPERM if any if an attached program was found * and if it returned != 1 during execution. In all other cases, 0 is returned. */ int __cgroup_bpf_run_filter_sk(struct sock *sk, enum bpf_attach_type type) { struct cgroup *cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); struct bpf_prog *prog; int ret = 0; rcu_read_lock(); prog = rcu_dereference(cgrp->bpf.effective[type]); if (prog) ret = BPF_PROG_RUN(prog, sk) == 1 ? 0 : -EPERM; rcu_read_unlock(); return ret; } EXPORT_SYMBOL(__cgroup_bpf_run_filter_sk); git.cgi/linux/net-next.git/patch/tools/build/feature/test-gtk2.c?id=3365135d43f861003555c963b309672d053a2228'>patch) treebfef4adec5da118bf1b3df7e5cff74f45af9e02d /tools/build/feature/test-gtk2.c parent5906374446386fd16fe562b042429d905d231ec3 (diff)parente0d76fa4475ef2cf4b52d18588b8ce95153d021b (diff)
Merge tag 'xfs-for-linus-4.10-rc6-5' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull xfs uodates from Darrick Wong: "I have some more fixes this week: better input validation, corruption avoidance, build fixes, memory leak fixes, and a couple from Christoph to avoid an ENOSPC failure. Summary: - Fix race conditions in the CoW code - Fix some incorrect input validation checks - Avoid crashing fs by running out of space when freeing inodes - Fix toctou race wrt whether or not an inode has an attr - Fix build error on arm - Fix page refcount corruption when readahead fails - Don't corrupt userspace in the bmap ioctl" * tag 'xfs-for-linus-4.10-rc6-5' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux: xfs: prevent quotacheck from overloading inode lru xfs: fix bmv_count confusion w/ shared extents xfs: clear _XBF_PAGES from buffers when readahead page xfs: extsize hints are not unlikely in xfs_bmap_btalloc xfs: remove racy hasattr check from attr ops xfs: use per-AG reservations for the finobt xfs: only update mount/resv fields on success in __xfs_ag_resv_init xfs: verify dirblocklog correctly xfs: fix COW writeback race
Diffstat (limited to 'tools/build/feature/test-gtk2.c')