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https://github.com/torvalds/linux
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794e811d14
Create a new source file: req.c and add the request sending entry functions: __fuse_simple_request() fuse_simple_background() fuse_simple_notify_reply() Introduce transport layer sending functions that are called by the respective fs layer function: fuse_chan_send() fuse_chan_send_bg() fuse_chan_send_notify_reply() Move calculation of request header fields uid, gid and pid from fuse_get_req() and fuse_force_creads() to a new helper: fuse_fill_creds(). These fileds are now passed to the transport layer via struct fuse_args. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include "dev.h"
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#include "fuse_i.h"
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static int fuse_fill_creds(struct fuse_mount *fm, struct fuse_args *args, struct mnt_idmap *idmap)
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{
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struct fuse_conn *fc = fm->fc;
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bool no_idmap = !fm->sb || (fm->sb->s_iflags & SB_I_NOIDMAP);
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kuid_t fsuid = mapped_fsuid(idmap, fc->user_ns);
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kgid_t fsgid = mapped_fsgid(idmap, fc->user_ns);
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args->pid = pid_nr_ns(task_pid(current), fc->pid_ns);
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if (args->force) {
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if (args->nocreds)
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return 0;
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if (no_idmap) {
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args->uid = from_kuid_munged(fc->user_ns, current_fsuid());
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args->gid = from_kgid_munged(fc->user_ns, current_fsgid());
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} else {
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args->uid = FUSE_INVALID_UIDGID;
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args->gid = FUSE_INVALID_UIDGID;
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}
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return 0;
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}
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WARN_ON(args->nocreds);
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/*
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* Keep the old behavior when idmappings support was not
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* declared by a FUSE server.
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*
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* For those FUSE servers who support idmapped mounts, we send UID/GID
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* only along with "inode creation" fuse requests, otherwise idmap ==
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* &invalid_mnt_idmap and req->in.h.{u,g}id will be equal to
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* FUSE_INVALID_UIDGID.
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*/
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if (no_idmap) {
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fsuid = current_fsuid();
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fsgid = current_fsgid();
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}
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args->uid = from_kuid(fc->user_ns, fsuid);
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args->gid = from_kgid(fc->user_ns, fsgid);
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if (no_idmap && unlikely(args->uid == ((uid_t)-1) || args->gid == ((gid_t)-1)))
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return -EOVERFLOW;
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return 0;
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}
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static int fuse_req_prep(struct fuse_mount *fm, struct fuse_args *args, struct mnt_idmap *idmap)
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{
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if (!args->force && fm->fc->conn_error)
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return -ECONNREFUSED;
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return fuse_fill_creds(fm, args, idmap);
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}
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ssize_t __fuse_simple_request(struct mnt_idmap *idmap, struct fuse_mount *fm,
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struct fuse_args *args)
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{
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struct fuse_conn *fc = fm->fc;
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int err = fuse_req_prep(fm, args, idmap);
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if (err)
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return err;
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return fuse_chan_send(fc->chan, args);
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}
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int fuse_simple_background(struct fuse_mount *fm, struct fuse_args *args, gfp_t gfp_flags)
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{
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struct fuse_conn *fc = fm->fc;
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int err;
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WARN_ON(args->force && !args->nocreds);
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err = fuse_req_prep(fm, args, &invalid_mnt_idmap);
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if (err)
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return err;
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return fuse_chan_send_bg(fc->chan, args, gfp_flags);
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}
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EXPORT_SYMBOL_GPL(fuse_simple_background);
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int fuse_simple_notify_reply(struct fuse_mount *fm, struct fuse_args *args, u64 unique)
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{
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struct fuse_conn *fc = fm->fc;
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int err;
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WARN_ON(args->force && !args->nocreds);
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err = fuse_req_prep(fm, args, &invalid_mnt_idmap);
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if (err)
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return err;
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return fuse_chan_send_notify_reply(fc->chan, args, unique);
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}
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