Move the truncation code out of vn_open and into the open system call
after the acquisition of any advisory locks. This fix corrects a case in which a process tries to open a file with a non-blocking exclusive lock. Even if it fails to get the lock it would still truncate the file even though its open failed. With this change, the truncation is done only after the lock is successfully acquired. Obtained from: BSD/OS
This commit is contained in:
parent
3764219663
commit
e6796b67d9
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=62550
@ -1538,10 +1538,11 @@ ccdlookup(path, p, vpp)
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{
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struct nameidata nd;
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struct vnode *vp;
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int error;
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int error, flags;
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, path, p);
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if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0) {
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flags = FREAD | FWRITE;
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if ((error = vn_open(&nd, &flags, 0)) != 0) {
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#ifdef DEBUG
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if (ccddebug & CCDB_FOLLOW|CCDB_INIT)
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printf("ccdlookup: vn_open error = %d\n", error);
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@ -539,13 +539,13 @@ vniocattach_file(vn, vio, dev, flag, p)
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flags = FREAD|FWRITE;
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, vio->vn_file, p);
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error = vn_open(&nd, flags, 0);
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error = vn_open(&nd, &flags, 0);
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if (error) {
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if (error != EACCES && error != EPERM && error != EROFS)
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return (error);
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flags &= ~FWRITE;
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, vio->vn_file, p);
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error = vn_open(&nd, flags, 0);
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error = vn_open(&nd, &flags, 0);
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if (error)
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return (error);
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}
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@ -1538,10 +1538,11 @@ ccdlookup(path, p, vpp)
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{
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struct nameidata nd;
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struct vnode *vp;
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int error;
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int error, flags;
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, path, p);
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if ((error = vn_open(&nd, FREAD|FWRITE, 0)) != 0) {
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flags = FREAD | FWRITE;
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if ((error = vn_open(&nd, &flags, 0)) != 0) {
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#ifdef DEBUG
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if (ccddebug & CCDB_FOLLOW|CCDB_INIT)
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printf("ccdlookup: vn_open error = %d\n", error);
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@ -117,7 +117,7 @@ acct(a1, uap)
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{
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struct proc *p = curproc; /* XXX */
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struct nameidata nd;
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int error;
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int error, flags;
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/* Make sure that the caller is root. */
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error = suser(p);
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@ -131,7 +131,8 @@ acct(a1, uap)
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if (SCARG(uap, path) != NULL) {
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NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path),
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p);
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error = vn_open(&nd, FWRITE, 0);
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flags = FWRITE;
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error = vn_open(&nd, &flags, 0);
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if (error)
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return (error);
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NDFREE(&nd, NDF_ONLY_PNBUF);
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@ -253,7 +253,7 @@ ktrace(curp, uap)
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int ops = KTROP(uap->ops);
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int descend = uap->ops & KTRFLAG_DESCEND;
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int ret = 0;
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int error = 0;
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int flags, error = 0;
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struct nameidata nd;
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curp->p_traceflag |= KTRFAC_ACTIVE;
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@ -262,7 +262,8 @@ ktrace(curp, uap)
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* an operation which requires a file argument.
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*/
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NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->fname, curp);
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error = vn_open(&nd, FREAD|FWRITE|O_NOFOLLOW, 0);
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flags = FREAD | FWRITE | O_NOFOLLOW;
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error = vn_open(&nd, &flags, 0);
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if (error) {
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curp->p_traceflag &= ~KTRFAC_ACTIVE;
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return (error);
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@ -1175,7 +1175,7 @@ linker_search_path(const char *name)
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struct nameidata nd;
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struct proc *p = curproc; /* XXX */
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char *cp, *ep, *result, **cpp;
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int error, extlen, len;
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int error, extlen, len, flags;
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enum vtype type;
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/* qualified at all? */
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@ -1211,7 +1211,8 @@ linker_search_path(const char *name)
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* and it's a regular file.
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*/
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, p);
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error = vn_open(&nd, FREAD, 0);
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flags = FREAD;
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error = vn_open(&nd, &flags, 0);
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if (error == 0) {
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NDFREE(&nd, NDF_ONLY_PNBUF);
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type = nd.ni_vp->v_type;
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@ -1598,7 +1598,7 @@ coredump(p)
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register struct ucred *cred = p->p_ucred;
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struct nameidata nd;
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struct vattr vattr;
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int error, error1;
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int error, error1, flags;
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char *name; /* name of corefile */
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off_t limit;
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@ -1621,7 +1621,8 @@ coredump(p)
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name = expand_name(p->p_comm, p->p_ucred->cr_uid, p->p_pid);
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NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, name, p);
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error = vn_open(&nd, O_CREAT | FWRITE | O_NOFOLLOW, S_IRUSR | S_IWUSR);
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flags = O_CREAT | FWRITE | O_NOFOLLOW;
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error = vn_open(&nd, &flags, S_IRUSR | S_IWUSR);
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free(name, M_TEMP);
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if (error)
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return (error);
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@ -192,13 +192,14 @@ link_aout_load_file(linker_class_t lc, const char* filename, linker_file_t* resu
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struct nameidata nd;
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struct proc* p = curproc; /* XXX */
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int error = 0;
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int resid;
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int resid, flags;
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struct exec header;
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aout_file_t af;
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linker_file_t lf = 0;
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, filename, p);
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error = vn_open(&nd, FREAD, 0);
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flags = FREAD;
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error = vn_open(&nd, &flags, 0);
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if (error)
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return error;
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NDFREE(&nd, NDF_ONLY_PNBUF);
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@ -504,7 +504,7 @@ link_elf_load_file(linker_class_t cls, const char* filename, linker_file_t* resu
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Elf_Addr base_vaddr;
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Elf_Addr base_vlimit;
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int error = 0;
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int resid;
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int resid, flags;
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elf_file_t ef;
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linker_file_t lf;
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Elf_Shdr *shdr;
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@ -517,7 +517,8 @@ link_elf_load_file(linker_class_t cls, const char* filename, linker_file_t* resu
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lf = NULL;
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, filename, p);
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error = vn_open(&nd, FREAD, 0);
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flags = FREAD;
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error = vn_open(&nd, &flags, 0);
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if (error)
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return error;
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NDFREE(&nd, NDF_ONLY_PNBUF);
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@ -504,7 +504,7 @@ link_elf_load_file(linker_class_t cls, const char* filename, linker_file_t* resu
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Elf_Addr base_vaddr;
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Elf_Addr base_vlimit;
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int error = 0;
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int resid;
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int resid, flags;
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elf_file_t ef;
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linker_file_t lf;
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Elf_Shdr *shdr;
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@ -517,7 +517,8 @@ link_elf_load_file(linker_class_t cls, const char* filename, linker_file_t* resu
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lf = NULL;
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, filename, p);
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error = vn_open(&nd, FREAD, 0);
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flags = FREAD;
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error = vn_open(&nd, &flags, 0);
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if (error)
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return error;
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NDFREE(&nd, NDF_ONLY_PNBUF);
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@ -968,9 +968,10 @@ open(p, uap)
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syscallarg(int) mode;
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} */ *uap;
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{
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register struct filedesc *fdp = p->p_fd;
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register struct file *fp;
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register struct vnode *vp;
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struct filedesc *fdp = p->p_fd;
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struct file *fp;
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struct vnode *vp;
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struct vattr vat;
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int cmode, flags, oflags;
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struct file *nfp;
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int type, indx, error;
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@ -988,7 +989,7 @@ open(p, uap)
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cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT;
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
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p->p_dupfd = -indx - 1; /* XXX check for fdopen */
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error = vn_open(&nd, flags, cmode);
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error = vn_open(&nd, &flags, cmode);
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if (error) {
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ffree(fp);
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if ((error == ENODEV || error == ENXIO) &&
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@ -1011,6 +1012,7 @@ open(p, uap)
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fp->f_flag = flags & FMASK;
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fp->f_ops = &vnops;
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fp->f_type = (vp->v_type == VFIFO ? DTYPE_FIFO : DTYPE_VNODE);
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VOP_UNLOCK(vp, 0, p);
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if (flags & (O_EXLOCK | O_SHLOCK)) {
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lf.l_whence = SEEK_SET;
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lf.l_start = 0;
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@ -1022,22 +1024,30 @@ open(p, uap)
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type = F_FLOCK;
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if ((flags & FNONBLOCK) == 0)
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type |= F_WAIT;
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VOP_UNLOCK(vp, 0, p);
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if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) {
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(void) vn_close(vp, fp->f_flag, fp->f_cred, p);
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ffree(fp);
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fdp->fd_ofiles[indx] = NULL;
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return (error);
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}
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
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if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0)
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goto bad;
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fp->f_flag |= FHASLOCK;
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}
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if (flags & O_TRUNC) {
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VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
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VATTR_NULL(&vat);
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vat.va_size = 0;
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
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error = VOP_SETATTR(vp, &vat, p->p_ucred, p);
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VOP_UNLOCK(vp, 0, p);
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if (error)
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goto bad;
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}
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/* assert that vn_open created a backing object if one is needed */
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KASSERT(!vn_canvmio(vp) || vp->v_object != NULL,
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("open: vmio vnode has no backing object after vn_open"));
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VOP_UNLOCK(vp, 0, p);
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p->p_retval[0] = indx;
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return (0);
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bad:
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(void) vn_close(vp, fp->f_flag, fp->f_cred, p);
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ffree(fp);
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fdp->fd_ofiles[indx] = NULL;
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return (error);
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}
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#ifdef COMPAT_43
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@ -968,9 +968,10 @@ open(p, uap)
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syscallarg(int) mode;
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} */ *uap;
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{
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register struct filedesc *fdp = p->p_fd;
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register struct file *fp;
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register struct vnode *vp;
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struct filedesc *fdp = p->p_fd;
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struct file *fp;
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struct vnode *vp;
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struct vattr vat;
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int cmode, flags, oflags;
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struct file *nfp;
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int type, indx, error;
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@ -988,7 +989,7 @@ open(p, uap)
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cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT;
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
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p->p_dupfd = -indx - 1; /* XXX check for fdopen */
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error = vn_open(&nd, flags, cmode);
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error = vn_open(&nd, &flags, cmode);
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if (error) {
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ffree(fp);
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if ((error == ENODEV || error == ENXIO) &&
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@ -1011,6 +1012,7 @@ open(p, uap)
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fp->f_flag = flags & FMASK;
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fp->f_ops = &vnops;
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fp->f_type = (vp->v_type == VFIFO ? DTYPE_FIFO : DTYPE_VNODE);
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VOP_UNLOCK(vp, 0, p);
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if (flags & (O_EXLOCK | O_SHLOCK)) {
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lf.l_whence = SEEK_SET;
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lf.l_start = 0;
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@ -1022,22 +1024,30 @@ open(p, uap)
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type = F_FLOCK;
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if ((flags & FNONBLOCK) == 0)
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type |= F_WAIT;
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VOP_UNLOCK(vp, 0, p);
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if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0) {
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(void) vn_close(vp, fp->f_flag, fp->f_cred, p);
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ffree(fp);
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fdp->fd_ofiles[indx] = NULL;
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return (error);
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}
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
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if ((error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) != 0)
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goto bad;
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fp->f_flag |= FHASLOCK;
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}
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if (flags & O_TRUNC) {
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VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
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VATTR_NULL(&vat);
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vat.va_size = 0;
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
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error = VOP_SETATTR(vp, &vat, p->p_ucred, p);
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VOP_UNLOCK(vp, 0, p);
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if (error)
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goto bad;
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}
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/* assert that vn_open created a backing object if one is needed */
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KASSERT(!vn_canvmio(vp) || vp->v_object != NULL,
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("open: vmio vnode has no backing object after vn_open"));
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VOP_UNLOCK(vp, 0, p);
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p->p_retval[0] = indx;
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return (0);
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bad:
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(void) vn_close(vp, fp->f_flag, fp->f_cred, p);
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ffree(fp);
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fdp->fd_ofiles[indx] = NULL;
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return (error);
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}
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#ifdef COMPAT_43
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|
@ -98,25 +98,25 @@ struct filterops vn_rwfiltops[] = {
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* due to the NDINIT being done elsewhere.
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*/
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int
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vn_open(ndp, fmode, cmode)
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vn_open(ndp, flagp, cmode)
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register struct nameidata *ndp;
|
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int fmode, cmode;
|
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int *flagp, cmode;
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{
|
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register struct vnode *vp;
|
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register struct proc *p = ndp->ni_cnd.cn_proc;
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register struct ucred *cred = p->p_ucred;
|
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struct vnode *vp;
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struct proc *p = ndp->ni_cnd.cn_proc;
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struct ucred *cred = p->p_ucred;
|
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struct vattr vat;
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struct vattr *vap = &vat;
|
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int mode, error;
|
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int mode, fmode, error;
|
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|
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fmode = *flagp;
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if (fmode & O_CREAT) {
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ndp->ni_cnd.cn_nameiop = CREATE;
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ndp->ni_cnd.cn_flags = LOCKPARENT | LOCKLEAF;
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if ((fmode & O_EXCL) == 0 && (fmode & O_NOFOLLOW) == 0)
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ndp->ni_cnd.cn_flags |= FOLLOW;
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bwillwrite();
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error = namei(ndp);
|
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if (error)
|
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if ((error = namei(ndp)) != 0)
|
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return (error);
|
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if (ndp->ni_vp == NULL) {
|
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VATTR_NULL(vap);
|
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@ -127,12 +127,11 @@ vn_open(ndp, fmode, cmode)
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VOP_LEASE(ndp->ni_dvp, p, cred, LEASE_WRITE);
|
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error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
|
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&ndp->ni_cnd, vap);
|
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vput(ndp->ni_dvp);
|
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if (error) {
|
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NDFREE(ndp, NDF_ONLY_PNBUF);
|
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vput(ndp->ni_dvp);
|
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return (error);
|
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}
|
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vput(ndp->ni_dvp);
|
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ASSERT_VOP_UNLOCKED(ndp->ni_dvp, "create");
|
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ASSERT_VOP_LOCKED(ndp->ni_vp, "create");
|
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fmode &= ~O_TRUNC;
|
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@ -154,8 +153,7 @@ vn_open(ndp, fmode, cmode)
|
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ndp->ni_cnd.cn_nameiop = LOOKUP;
|
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ndp->ni_cnd.cn_flags =
|
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((fmode & O_NOFOLLOW) ? NOFOLLOW : FOLLOW) | LOCKLEAF;
|
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error = namei(ndp);
|
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if (error)
|
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if ((error = namei(ndp)) != 0)
|
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return (error);
|
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vp = ndp->ni_vp;
|
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}
|
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@ -187,18 +185,7 @@ vn_open(ndp, fmode, cmode)
|
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goto bad;
|
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}
|
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}
|
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if (fmode & O_TRUNC) {
|
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VOP_UNLOCK(vp, 0, p); /* XXX */
|
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VOP_LEASE(vp, p, cred, LEASE_WRITE);
|
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); /* XXX */
|
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VATTR_NULL(vap);
|
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vap->va_size = 0;
|
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error = VOP_SETATTR(vp, vap, cred, p);
|
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if (error)
|
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goto bad;
|
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}
|
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error = VOP_OPEN(vp, fmode, cred, p);
|
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if (error)
|
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if ((error = VOP_OPEN(vp, fmode, cred, p)) != 0)
|
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goto bad;
|
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/*
|
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* Make sure that a VM object is created for VMIO support.
|
||||
@ -210,10 +197,12 @@ vn_open(ndp, fmode, cmode)
|
||||
|
||||
if (fmode & FWRITE)
|
||||
vp->v_writecount++;
|
||||
*flagp = fmode;
|
||||
return (0);
|
||||
bad:
|
||||
NDFREE(ndp, NDF_ONLY_PNBUF);
|
||||
vput(vp);
|
||||
*flagp = fmode;
|
||||
return (error);
|
||||
}
|
||||
|
||||
|
@ -579,7 +579,7 @@ int debug_vn_lock __P((struct vnode *vp, int flags, struct proc *p,
|
||||
const char *filename, int line));
|
||||
#define vn_lock(vp,flags,p) debug_vn_lock(vp,flags,p,__FILE__,__LINE__)
|
||||
#endif
|
||||
int vn_open __P((struct nameidata *ndp, int fmode, int cmode));
|
||||
int vn_open __P((struct nameidata *ndp, int *flagp, int cmode));
|
||||
void vn_pollevent __P((struct vnode *vp, int events));
|
||||
void vn_pollgone __P((struct vnode *vp));
|
||||
int vn_pollrecord __P((struct vnode *vp, struct proc *p, int events));
|
||||
|
@ -307,7 +307,7 @@ ufs_extattrctl(struct mount *mp, int cmd, char *attrname,
|
||||
struct vnode *vp;
|
||||
char local_attrname[UFS_EXTATTR_MAXEXTATTRNAME]; /* inc null */
|
||||
char *filename;
|
||||
int error, len;
|
||||
int error, len, flags;
|
||||
|
||||
if ((error = suser_xxx(p->p_cred->pc_ucred, p, 0)))
|
||||
return (error);
|
||||
@ -329,7 +329,8 @@ ufs_extattrctl(struct mount *mp, int cmd, char *attrname,
|
||||
|
||||
filename = (char *) arg;
|
||||
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, filename, p);
|
||||
error = vn_open(&nd, FREAD|FWRITE, 0);
|
||||
flags = FREAD | FWRITE;
|
||||
error = vn_open(&nd, &flags, 0);
|
||||
if (error)
|
||||
return (error);
|
||||
|
||||
|
@ -393,12 +393,13 @@ quotaon(p, mp, type, fname)
|
||||
struct vnode *vp, **vpp;
|
||||
struct vnode *nextvp;
|
||||
struct dquot *dq;
|
||||
int error;
|
||||
int error, flags;
|
||||
struct nameidata nd;
|
||||
|
||||
vpp = &ump->um_quotas[type];
|
||||
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, fname, p);
|
||||
error = vn_open(&nd, FREAD|FWRITE, 0);
|
||||
flags = FREAD | FWRITE;
|
||||
error = vn_open(&nd, &flags, 0);
|
||||
if (error)
|
||||
return (error);
|
||||
NDFREE(&nd, NDF_ONLY_PNBUF);
|
||||
|
Loading…
Reference in New Issue
Block a user