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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100// SPDX-License-Identifier: GPL-2.0-only
#include "dev.h"#include "fuse_i.h"
static int fuse_fill_creds(struct fuse_mount *fm, struct fuse_args *args, struct mnt_idmap *idmap){ struct fuse_conn *fc = fm->fc; bool no_idmap = !fm->sb || (fm->sb->s_iflags & SB_I_NOIDMAP); kuid_t fsuid = mapped_fsuid(idmap, fc->user_ns); kgid_t fsgid = mapped_fsgid(idmap, fc->user_ns);
args->pid = pid_nr_ns(task_pid(current), fc->pid_ns);
if (args->force) { if (args->nocreds) return 0;
if (no_idmap) { args->uid = from_kuid_munged(fc->user_ns, current_fsuid()); args->gid = from_kgid_munged(fc->user_ns, current_fsgid()); } else { args->uid = FUSE_INVALID_UIDGID; args->gid = FUSE_INVALID_UIDGID; } return 0; }
WARN_ON(args->nocreds); /* * Keep the old behavior when idmappings support was not * declared by a FUSE server. * * For those FUSE servers who support idmapped mounts, we send UID/GID * only along with "inode creation" fuse requests, otherwise idmap == * &invalid_mnt_idmap and req->in.h.{u,g}id will be equal to * FUSE_INVALID_UIDGID. */ if (no_idmap) { fsuid = current_fsuid(); fsgid = current_fsgid(); } args->uid = from_kuid(fc->user_ns, fsuid); args->gid = from_kgid(fc->user_ns, fsgid);
if (no_idmap && unlikely(args->uid == ((uid_t)-1) || args->gid == ((gid_t)-1))) return -EOVERFLOW;
return 0;}
static int fuse_req_prep(struct fuse_mount *fm, struct fuse_args *args, struct mnt_idmap *idmap){ if (!args->force && fm->fc->conn_error) return -ECONNREFUSED;
return fuse_fill_creds(fm, args, idmap);}
ssize_t __fuse_simple_request(struct mnt_idmap *idmap, struct fuse_mount *fm, struct fuse_args *args){ struct fuse_conn *fc = fm->fc; int err = fuse_req_prep(fm, args, idmap);
if (err) return err;
return fuse_chan_send(fc->chan, args);}
int fuse_simple_background(struct fuse_mount *fm, struct fuse_args *args, gfp_t gfp_flags){ struct fuse_conn *fc = fm->fc; int err;
WARN_ON(args->force && !args->nocreds);
err = fuse_req_prep(fm, args, &invalid_mnt_idmap); if (err) return err;
return fuse_chan_send_bg(fc->chan, args, gfp_flags);}EXPORT_SYMBOL_GPL(fuse_simple_background);
int fuse_simple_notify_reply(struct fuse_mount *fm, struct fuse_args *args, u64 unique){ struct fuse_conn *fc = fm->fc; int err;
WARN_ON(args->force && !args->nocreds);
err = fuse_req_prep(fm, args, &invalid_mnt_idmap); if (err) return err;
return fuse_chan_send_notify_reply(fc->chan, args, unique);}