diff options
Diffstat (limited to 'sys/fs/devfs/devfs_vnops.c')
| -rw-r--r-- | sys/fs/devfs/devfs_vnops.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/sys/fs/devfs/devfs_vnops.c b/sys/fs/devfs/devfs_vnops.c index 552ddd2..fe8e9ef 100644 --- a/sys/fs/devfs/devfs_vnops.c +++ b/sys/fs/devfs/devfs_vnops.c @@ -51,6 +51,7 @@ #include <sys/kernel.h> #include <sys/lock.h> #include <sys/malloc.h> +#include <sys/mman.h> #include <sys/mount.h> #include <sys/namei.h> #include <sys/priv.h> @@ -71,6 +72,10 @@ static struct fileops devfs_ops_f; #include <security/mac/mac_framework.h> +#include <vm/vm.h> +#include <vm/vm_extern.h> +#include <vm/vm_object.h> + static MALLOC_DEFINE(M_CDEVPDATA, "DEVFSP", "Metainfo for cdev-fp data"); struct mtx devfs_de_interlock; @@ -1738,6 +1743,65 @@ devfs_write_f(struct file *fp, struct uio *uio, struct ucred *cred, return (error); } +static int +devfs_mmap_f(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size, + vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff, + struct thread *td) +{ + struct cdev *dev; + struct cdevsw *dsw; + struct mount *mp; + struct vnode *vp; + struct file *fpop; + vm_object_t object; + vm_prot_t maxprot; + int error, ref; + + vp = fp->f_vnode; + + /* + * Ensure that file and memory protections are + * compatible. + */ + mp = vp->v_mount; + if (mp != NULL && (mp->mnt_flag & MNT_NOEXEC) != 0) + maxprot = VM_PROT_NONE; + else + maxprot = VM_PROT_EXECUTE; + if ((fp->f_flag & FREAD) != 0) + maxprot |= VM_PROT_READ; + else if ((prot & VM_PROT_READ) != 0) + return (EACCES); + + /* + * Character devices always share mappings, so + * require a writable fd for writable mappings. + */ + if ((fp->f_flag & FWRITE) != 0) + maxprot |= VM_PROT_WRITE; + else if ((prot & VM_PROT_WRITE) != 0) + return (EACCES); + maxprot &= cap_maxprot; + + fpop = td->td_fpop; + error = devfs_fp_check(fp, &dev, &dsw, &ref); + if (error != 0) + return (error); + + error = vm_mmap_cdev(td, size, prot, &maxprot, &flags, dev, dsw, &foff, + &object); + td->td_fpop = fpop; + dev_relthread(dev, ref); + if (error != 0) + return (error); + + error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object, + foff, FALSE, td); + if (error != 0) + vm_object_deallocate(object); + return (error); +} + dev_t dev2udev(struct cdev *x) { @@ -1760,6 +1824,7 @@ static struct fileops devfs_ops_f = { .fo_sendfile = vn_sendfile, .fo_seek = vn_seek, .fo_fill_kinfo = vn_fill_kinfo, + .fo_mmap = devfs_mmap_f, .fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE }; |
