cef94e096e
m_out is shared between threads as the reply message, and it can happen results get overwritten by another thread before the reply is sent. This change . makes m_out local to the message handling function, declared on the stack of the caller . forces callers of reply() to give it a message, or declare the reply message has no significant fields except for the return code by calling replycode() Change-Id: Id06300083a63c72c00f34f86a5c7d96e4bbdf9f6
323 lines
8.9 KiB
C
323 lines
8.9 KiB
C
/* This file contains the code for performing four system calls relating to
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* status and directories.
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*
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* The entry points into this file are
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* do_chdir: perform the CHDIR system call
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* do_chroot: perform the CHROOT system call
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* do_lstat: perform the LSTAT system call
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* do_stat: perform the STAT system call
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* do_fstat: perform the FSTAT system call
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* do_fstatfs: perform the FSTATFS system call
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* do_statvfs: perform the STATVFS system call
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* do_fstatvfs: perform the FSTATVFS system call
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*/
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#include "fs.h"
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#include <sys/stat.h>
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#include <sys/statfs.h>
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#include <minix/com.h>
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#include <minix/u64.h>
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#include <string.h>
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#include "file.h"
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#include "fproc.h"
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#include "path.h"
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#include "param.h"
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#include <minix/vfsif.h>
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#include <minix/callnr.h>
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#include "vnode.h"
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#include "vmnt.h"
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static int change_into(struct vnode **iip, struct vnode *vp);
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/*===========================================================================*
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* do_fchdir *
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*===========================================================================*/
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int do_fchdir(message *UNUSED(m_out))
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{
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/* Change directory on already-opened fd. */
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struct filp *rfilp;
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int r, rfd;
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rfd = job_m_in.fd;
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/* Is the file descriptor valid? */
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if ((rfilp = get_filp(rfd, VNODE_READ)) == NULL) return(err_code);
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r = change_into(&fp->fp_wd, rfilp->filp_vno);
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unlock_filp(rfilp);
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return(r);
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}
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/*===========================================================================*
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* do_chdir *
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*===========================================================================*/
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int do_chdir(message *UNUSED(m_out))
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{
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/* Perform the chdir(name) system call.
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* syscall might provide 'name' embedded in the message.
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*/
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int r;
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struct vnode *vp;
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struct vmnt *vmp;
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char fullpath[PATH_MAX];
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struct lookup resolve;
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vir_bytes vname;
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size_t vname_length;
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vname = (vir_bytes) job_m_in.name;
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vname_length = (size_t) job_m_in.name_length;
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if (copy_name(vname_length, fullpath) != OK) {
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/* Direct copy failed, try fetching from user space */
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if (fetch_name(vname, vname_length, fullpath) != OK)
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return(err_code);
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}
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/* Try to open the directory */
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lookup_init(&resolve, fullpath, PATH_NOFLAGS, &vmp, &vp);
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resolve.l_vmnt_lock = VMNT_READ;
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resolve.l_vnode_lock = VNODE_READ;
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if ((vp = eat_path(&resolve, fp)) == NULL) return(err_code);
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r = change_into(&fp->fp_wd, vp);
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unlock_vnode(vp);
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unlock_vmnt(vmp);
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put_vnode(vp);
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return(r);
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}
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/*===========================================================================*
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* do_chroot *
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*===========================================================================*/
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int do_chroot(message *UNUSED(m_out))
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{
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/* Perform the chroot(name) system call.
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* syscall might provide 'name' embedded in the message.
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*/
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int r;
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struct vnode *vp;
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struct vmnt *vmp;
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char fullpath[PATH_MAX];
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struct lookup resolve;
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vir_bytes vname;
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size_t vname_length;
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vname = (vir_bytes) job_m_in.name;
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vname_length = (size_t) job_m_in.name_length;
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if (!super_user) return(EPERM); /* only su may chroot() */
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if (copy_name(vname_length, fullpath) != OK) {
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/* Direct copy failed, try fetching from user space */
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if (fetch_name(vname, vname_length, fullpath) != OK)
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return(err_code);
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}
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/* Try to open the directory */
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lookup_init(&resolve, fullpath, PATH_NOFLAGS, &vmp, &vp);
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resolve.l_vmnt_lock = VMNT_READ;
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resolve.l_vnode_lock = VNODE_READ;
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if ((vp = eat_path(&resolve, fp)) == NULL) return(err_code);
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r = change_into(&fp->fp_rd, vp);
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unlock_vnode(vp);
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unlock_vmnt(vmp);
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put_vnode(vp);
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return(r);
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}
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/*===========================================================================*
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* change_into *
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*===========================================================================*/
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static int change_into(struct vnode **result, struct vnode *vp)
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{
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int r;
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if (*result == vp) return(OK); /* Nothing to do */
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/* It must be a directory and also be searchable */
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if (!S_ISDIR(vp->v_mode))
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r = ENOTDIR;
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else
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r = forbidden(fp, vp, X_BIT); /* Check if dir is searchable*/
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if (r != OK) return(r);
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/* Everything is OK. Make the change. */
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put_vnode(*result); /* release the old directory */
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dup_vnode(vp);
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*result = vp; /* acquire the new one */
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return(OK);
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}
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/*===========================================================================*
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* do_stat *
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*===========================================================================*/
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int do_stat(message *UNUSED(m_out))
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{
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/* Perform the stat(name, buf) system call. */
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int r;
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struct vnode *vp;
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struct vmnt *vmp;
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char fullpath[PATH_MAX];
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struct lookup resolve;
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vir_bytes vname1, statbuf;
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size_t vname1_length;
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vname1 = (vir_bytes) job_m_in.name1;
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vname1_length = (size_t) job_m_in.name1_length;
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statbuf = (vir_bytes) job_m_in.m1_p2;
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lookup_init(&resolve, fullpath, PATH_NOFLAGS, &vmp, &vp);
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resolve.l_vmnt_lock = VMNT_READ;
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resolve.l_vnode_lock = VNODE_READ;
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if (fetch_name(vname1, vname1_length, fullpath) != OK) return(err_code);
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if ((vp = eat_path(&resolve, fp)) == NULL) return(err_code);
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r = req_stat(vp->v_fs_e, vp->v_inode_nr, who_e, statbuf);
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unlock_vnode(vp);
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unlock_vmnt(vmp);
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put_vnode(vp);
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return r;
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}
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/*===========================================================================*
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* do_fstat *
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*===========================================================================*/
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int do_fstat(message *UNUSED(m_out))
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{
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/* Perform the fstat(fd, buf) system call. */
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register struct filp *rfilp;
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int r, rfd;
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vir_bytes statbuf;
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statbuf = (vir_bytes) job_m_in.buffer;
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rfd = job_m_in.fd;
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/* Is the file descriptor valid? */
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if ((rfilp = get_filp(rfd, VNODE_READ)) == NULL) return(err_code);
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r = req_stat(rfilp->filp_vno->v_fs_e, rfilp->filp_vno->v_inode_nr,
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who_e, statbuf);
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unlock_filp(rfilp);
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return(r);
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}
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/*===========================================================================*
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* do_fstatfs *
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*===========================================================================*/
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int do_fstatfs(message *UNUSED(m_out))
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{
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/* Perform the fstatfs(fd, buf) system call. */
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struct filp *rfilp;
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int r, rfd;
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vir_bytes statbuf;
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rfd = job_m_in.fd;
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statbuf = (vir_bytes) job_m_in.buffer;
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/* Is the file descriptor valid? */
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if( (rfilp = get_filp(rfd, VNODE_READ)) == NULL) return(err_code);
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r = req_fstatfs(rfilp->filp_vno->v_fs_e, who_e, statbuf);
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unlock_filp(rfilp);
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return(r);
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}
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/*===========================================================================*
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* do_statvfs *
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*===========================================================================*/
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int do_statvfs(message *UNUSED(m_out))
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{
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/* Perform the stat(name, buf) system call. */
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int r;
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struct vnode *vp;
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struct vmnt *vmp;
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char fullpath[PATH_MAX];
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struct lookup resolve;
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vir_bytes vname1, statbuf;
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size_t vname1_length;
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vname1 = (vir_bytes) job_m_in.name1;
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vname1_length = (size_t) job_m_in.name1_length;
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statbuf = (vir_bytes) job_m_in.name2;
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lookup_init(&resolve, fullpath, PATH_NOFLAGS, &vmp, &vp);
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resolve.l_vmnt_lock = VMNT_READ;
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resolve.l_vnode_lock = VNODE_READ;
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if (fetch_name(vname1, vname1_length, fullpath) != OK) return(err_code);
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if ((vp = eat_path(&resolve, fp)) == NULL) return(err_code);
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r = req_statvfs(vp->v_fs_e, who_e, statbuf);
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unlock_vnode(vp);
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unlock_vmnt(vmp);
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put_vnode(vp);
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return r;
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}
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/*===========================================================================*
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* do_fstatvfs *
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*===========================================================================*/
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int do_fstatvfs(message *UNUSED(m_out))
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{
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/* Perform the fstat(fd, buf) system call. */
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register struct filp *rfilp;
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int r, rfd;
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vir_bytes statbuf;
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rfd = job_m_in.fd;
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statbuf = (vir_bytes) job_m_in.name2;
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/* Is the file descriptor valid? */
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if ((rfilp = get_filp(rfd, VNODE_READ)) == NULL) return(err_code);
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r = req_statvfs(rfilp->filp_vno->v_fs_e, who_e, statbuf);
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unlock_filp(rfilp);
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return(r);
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}
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/*===========================================================================*
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* do_lstat *
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*===========================================================================*/
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int do_lstat(message *UNUSED(m_out))
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{
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/* Perform the lstat(name, buf) system call. */
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struct vnode *vp;
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struct vmnt *vmp;
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int r;
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char fullpath[PATH_MAX];
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struct lookup resolve;
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vir_bytes vname1, statbuf;
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size_t vname1_length;
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vname1 = (vir_bytes) job_m_in.name1;
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vname1_length = (size_t) job_m_in.name1_length;
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statbuf = (vir_bytes) job_m_in.name2;
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lookup_init(&resolve, fullpath, PATH_RET_SYMLINK, &vmp, &vp);
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resolve.l_vmnt_lock = VMNT_READ;
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resolve.l_vnode_lock = VNODE_READ;
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if (fetch_name(vname1, vname1_length, fullpath) != OK) return(err_code);
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if ((vp = eat_path(&resolve, fp)) == NULL) return(err_code);
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r = req_stat(vp->v_fs_e, vp->v_inode_nr, who_e, statbuf);
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unlock_vnode(vp);
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unlock_vmnt(vmp);
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put_vnode(vp);
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return(r);
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}
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