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vfs: define struct filename and have getname() return it

Browse source 
getname() is intended to copy pathname strings from userspace into a
kernel buffer. The result is just a string in kernel space. It would
however be quite helpful to be able to attach some ancillary info to
the string.

For instance, we could attach some audit-related info to reduce the
amount of audit-related processing needed. When auditing is enabled,
we could also call getname() on the string more than once and not
need to recopy it from userspace.

This patchset converts the getname()/putname() interfaces to return
a struct instead of a string. For now, the struct just tracks the
string in kernel space and the original userland pointer for it.

Later, we'll add other information to the struct as it becomes
convenient.

Change-Id: Ib690c3dd4d56624f0ddb081e1c1d4f23c2dd0cd1
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Jeff Layton 2012-10-10 15:25:28 -04:00 committed by Artem Borisov
parent aa0c13bbbe
commit 3df0a6646d
39 changed files with 210 additions and 167 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
arch/alpha/kernel/osf_sys.c
View file

@ -289,7 +289,7 @@ osf_ufs_mount(char *dirname, struct ufs_args __user *args, int flags)
{
int retval;
struct cdfs_args tmp;
char *devname;
struct filename *devname;
retval = -EFAULT;
if (copy_from_user(&tmp, args, sizeof(tmp)))
@ -298,7 +298,7 @@ osf_ufs_mount(char *dirname, struct ufs_args __user *args, int flags)
retval = PTR_ERR(devname);
if (IS_ERR(devname))
goto out;
retval = do_mount(devname, dirname, "ext2", flags, NULL);
retval = do_mount(devname->name, dirname, "ext2", flags, NULL);
putname(devname);
out:
return retval;
@ -309,7 +309,7 @@ osf_cdfs_mount(char *dirname, struct cdfs_args __user *args, int flags)
{
int retval;
struct cdfs_args tmp;
char *devname;
struct filename *devname;
retval = -EFAULT;
if (copy_from_user(&tmp, args, sizeof(tmp)))
@ -318,7 +318,7 @@ osf_cdfs_mount(char *dirname, struct cdfs_args __user *args, int flags)
retval = PTR_ERR(devname);
if (IS_ERR(devname))
goto out;
retval = do_mount(devname, dirname, "iso9660", flags, NULL);
retval = do_mount(devname->name, dirname, "iso9660", flags, NULL);
putname(devname);
out:
return retval;
@ -339,7 +339,7 @@ SYSCALL_DEFINE4(osf_mount, unsigned long, typenr, const char __user *, path,
int, flag, void __user *, data)
{
int retval;
char *name;
struct filename *name;
name = getname(path);
retval = PTR_ERR(name);
@ -347,13 +347,13 @@ SYSCALL_DEFINE4(osf_mount, unsigned long, typenr, const char __user *, path,
goto out;
switch (typenr) {
case 1:
retval = osf_ufs_mount(name, data, flag);
retval = osf_ufs_mount(name->name, data, flag);
break;
case 6:
retval = osf_cdfs_mount(name, data, flag);
retval = osf_cdfs_mount(name->name, data, flag);
break;
case 9:
retval = osf_procfs_mount(name, data, flag);
retval = osf_procfs_mount(name->name, data, flag);
break;
default:
retval = -EINVAL;

4
arch/arm/kernel/sys_arm.c
View file

@ -67,13 +67,13 @@ asmlinkage int sys_execve(const char __user *filenamei,
const char __user *const __user *envp, struct pt_regs *regs)
{
int error;
char * filename;
struct filename *filename;
filename = getname(filenamei);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename, argv, envp, regs);
error = do_execve(filename->name, argv, envp, regs);
putname(filename);
out:
return error;

4
arch/avr32/kernel/process.c
View file

@ -388,14 +388,14 @@ asmlinkage int sys_execve(const char __user *ufilename,
struct pt_regs *regs)
{
int error;
char *filename;
struct filename *filename;
filename = getname(ufilename);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename, uargv, uenvp, regs);
error = do_execve(filename->name, uargv, uenvp, regs);
putname(filename);
out:

4
arch/blackfin/kernel/process.c
View file

@ -211,14 +211,14 @@ asmlinkage int sys_execve(const char __user *name,
const char __user *const __user *envp)
{
int error;
char *filename;
struct filename *filename;
struct pt_regs *regs = (struct pt_regs *)((&name) + 6);
filename = getname(name);
error = PTR_ERR(filename);
if (IS_ERR(filename))
return error;
error = do_execve(filename, argv, envp, regs);
error = do_execve(filename->name, argv, envp, regs);
putname(filename);
return error;
}

4
arch/cris/arch-v10/kernel/process.c
View file

@ -212,14 +212,14 @@ asmlinkage int sys_execve(const char *fname,
struct pt_regs *regs)
{
int error;
char *filename;
struct filename *filename;
filename = getname(fname);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename, argv, envp, regs);
error = do_execve(filename->name, argv, envp, regs);
putname(filename);
out:
return error;

4
arch/cris/arch-v32/kernel/process.c
View file

@ -224,7 +224,7 @@ sys_execve(const char *fname,
struct pt_regs *regs)
{
int error;
char *filename;
struct filename *filename;
filename = getname(fname);
error = PTR_ERR(filename);
@ -232,7 +232,7 @@ sys_execve(const char *fname,
if (IS_ERR(filename))
goto out;
error = do_execve(filename, argv, envp, regs);
error = do_execve(filename->name, argv, envp, regs);
putname(filename);
out:
return error;

4
arch/h8300/kernel/process.c
View file

@ -217,14 +217,14 @@ asmlinkage int sys_execve(const char *name,
int dummy, ...)
{
int error;
char * filename;
struct filename *filename;
struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
filename = getname(name);
error = PTR_ERR(filename);
if (IS_ERR(filename))
return error;
error = do_execve(filename, argv, envp, regs);
error = do_execve(filename->name, argv, envp, regs);
putname(filename);
return error;
}

4
arch/hexagon/kernel/syscall.c
View file

@ -40,7 +40,7 @@ asmlinkage int sys_execve(char __user *ufilename,
const char __user *const __user *envp)
{
struct pt_regs *pregs = current_thread_info()->regs;
char *filename;
struct filename *filename;
int retval;
filename = getname(ufilename);
@ -48,7 +48,7 @@ asmlinkage int sys_execve(char __user *ufilename,
if (IS_ERR(filename))
return retval;
retval = do_execve(filename, argv, envp, pregs);
retval = do_execve(filename->name, argv, envp, pregs);
putname(filename);
return retval;

4
arch/ia64/kernel/process.c
View file

@ -636,14 +636,14 @@ sys_execve (const char __user *filename,
const char __user *const __user *envp,
struct pt_regs *regs)
{
char *fname;
struct filename *fname;
int error;
fname = getname(filename);
error = PTR_ERR(fname);
if (IS_ERR(fname))
goto out;
error = do_execve(fname, argv, envp, regs);
error = do_execve(fname->name, argv, envp, regs);
putname(fname);
out:
return error;

4
arch/m32r/kernel/process.c
View file

@ -296,14 +296,14 @@ asmlinkage int sys_execve(const char __user *ufilename,
unsigned long r6, struct pt_regs regs)
{
int error;
char *filename;
struct filename *filename;
filename = getname(ufilename);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename, uargv, uenvp, &regs);
error = do_execve(filename->name, uargv, uenvp, &regs);
putname(filename);
out:
return error;

4
arch/microblaze/kernel/sys_microblaze.c
View file

@ -54,13 +54,13 @@ asmlinkage long microblaze_execve(const char __user *filenamei,
struct pt_regs *regs)
{
int error;
char *filename;
struct filename *filename;
filename = getname(filenamei);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename, argv, envp, regs);
error = do_execve(filename->name, argv, envp, regs);
putname(filename);
out:
return error;

4
arch/mips/kernel/linux32.c
View file

@ -83,13 +83,13 @@ out:
asmlinkage int sys32_execve(nabi_no_regargs struct pt_regs regs)
{
int error;
char * filename;
struct filename *filename;
filename = getname(compat_ptr(regs.regs[4]));
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = compat_do_execve(filename, compat_ptr(regs.regs[5]),
error = compat_do_execve(filename->name, compat_ptr(regs.regs[5]),
compat_ptr(regs.regs[6]), &regs);
putname(filename);

4
arch/mips/kernel/syscall.c
View file

@ -133,13 +133,13 @@ _sys_clone(nabi_no_regargs struct pt_regs regs)
asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
{
int error;
char * filename;
struct filename *filename;
filename = getname((const char __user *) (long)regs.regs[4]);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename,
error = do_execve(filename->name,
(const char __user *const __user *) (long)regs.regs[5],
(const char __user *const __user *) (long)regs.regs[6],
&regs);

4
arch/openrisc/kernel/process.c
View file

@ -271,7 +271,7 @@ asmlinkage long _sys_execve(const char __user *name,
struct pt_regs *regs)
{
int error;
char *filename;
struct filename *filename;
filename = getname(name);
error = PTR_ERR(filename);
@ -279,7 +279,7 @@ asmlinkage long _sys_execve(const char __user *name,
if (IS_ERR(filename))
goto out;
error = do_execve(filename, argv, envp, regs);
error = do_execve(filename->name, argv, envp, regs);
putname(filename);
out:

4
arch/parisc/hpux/fs.c
View file

@ -34,14 +34,14 @@
int hpux_execve(struct pt_regs *regs)
{
int error;
char *filename;
struct filename *filename;
filename = getname((const char __user *) regs->gr[26]);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename,
error = do_execve(filename->name,
(const char __user *const __user *) regs->gr[25],
(const char __user *const __user *) regs->gr[24],
regs);

4
arch/parisc/kernel/process.c
View file

@ -342,13 +342,13 @@ unsigned long thread_saved_pc(struct task_struct *t)
asmlinkage int sys_execve(struct pt_regs *regs)
{
int error;
char *filename;
struct filename *filename;
filename = getname((const char __user *) regs->gr[26]);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename,
error = do_execve(filename->name,
(const char __user *const __user *) regs->gr[25],
(const char __user *const __user *) regs->gr[24],
regs);

4
arch/parisc/kernel/sys_parisc32.c
View file

@ -60,14 +60,14 @@
asmlinkage int sys32_execve(struct pt_regs *regs)
{
int error;
char *filename;
struct filename *filename;
DBG(("sys32_execve(%p) r26 = 0x%lx\n", regs, regs->gr[26]));
filename = getname((const char __user *) regs->gr[26]);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = compat_do_execve(filename, compat_ptr(regs->gr[25]),
error = compat_do_execve(filename->name, compat_ptr(regs->gr[25]),
compat_ptr(regs->gr[24]), regs);
putname(filename);
out:

4
arch/score/kernel/sys_score.c
View file

@ -92,14 +92,14 @@ asmlinkage long
score_execve(struct pt_regs *regs)
{
int error;
char *filename;
struct filename *filename;
filename = getname((char __user*)regs->regs[4]);
error = PTR_ERR(filename);
if (IS_ERR(filename))
return error;
error = do_execve(filename,
error = do_execve(filename->name,
(const char __user *const __user *)regs->regs[5],
(const char __user *const __user *)regs->regs[6],
regs);

4
arch/sh/kernel/process_32.c
View file

@ -302,14 +302,14 @@ asmlinkage int sys_execve(const char __user *ufilename,
{
struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
int error;
char *filename;
struct filename *filename;
filename = getname(ufilename);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename, uargv, uenvp, regs);
error = do_execve(filename->name, uargv, uenvp, regs);
putname(filename);
out:
return error;

4
arch/sh/kernel/process_64.c
View file

@ -490,14 +490,14 @@ asmlinkage int sys_execve(const char *ufilename, char **uargv,
struct pt_regs *pregs)
{
int error;
char *filename;
struct filename *filename;
filename = getname((char __user *)ufilename);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename,
error = do_execve(filename->name,
(const char __user *const __user *)uargv,
(const char __user *const __user *)uenvp,
pregs);

4
arch/sparc/kernel/process_32.c
View file

@ -625,7 +625,7 @@ int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
asmlinkage int sparc_execve(struct pt_regs *regs)
{
int error, base = 0;
char *filename;
struct filename *filename;
/* Check for indirect call. */
if(regs->u_regs[UREG_G1] == 0)
@ -635,7 +635,7 @@ asmlinkage int sparc_execve(struct pt_regs *regs)
error = PTR_ERR(filename);
if(IS_ERR(filename))
goto out;
error = do_execve(filename,
error = do_execve(filename->name,
(const char __user *const __user *)
regs->u_regs[base + UREG_I1],
(const char __user *const __user *)

4
arch/sparc/kernel/process_64.c
View file

@ -722,7 +722,7 @@ EXPORT_SYMBOL(dump_fpu);
asmlinkage int sparc_execve(struct pt_regs *regs)
{
int error, base = 0;
char *filename;
struct filename *filename;
/* User register window flush is done by entry.S */
@ -734,7 +734,7 @@ asmlinkage int sparc_execve(struct pt_regs *regs)
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename,
error = do_execve(filename->name,
(const char __user *const __user *)
regs->u_regs[base + UREG_I1],
(const char __user *const __user *)

4
arch/sparc/kernel/sys_sparc32.c
View file

@ -403,7 +403,7 @@ asmlinkage long compat_sys_rt_sigaction(int sig,
asmlinkage long sparc32_execve(struct pt_regs *regs)
{
int error, base = 0;
char *filename;
struct filename *filename;
/* User register window flush is done by entry.S */
@ -416,7 +416,7 @@ asmlinkage long sparc32_execve(struct pt_regs *regs)
if (IS_ERR(filename))
goto out;
error = compat_do_execve(filename,
error = compat_do_execve(filename->name,
compat_ptr(regs->u_regs[base + UREG_I1]),
compat_ptr(regs->u_regs[base + UREG_I2]), regs);

8
arch/tile/kernel/process.c
View file

@ -619,13 +619,13 @@ SYSCALL_DEFINE4(execve, const char __user *, path,
struct pt_regs *, regs)
{
long error;
char *filename;
struct filename *filename;
filename = getname(path);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename, argv, envp, regs);
error = do_execve(filename->name, argv, envp, regs);
putname(filename);
if (error == 0)
single_step_execve();
@ -640,13 +640,13 @@ long compat_sys_execve(const char __user *path,
struct pt_regs *regs)
{
long error;
char *filename;
struct filename *filename;
filename = getname(path);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = compat_do_execve(filename, argv, envp, regs);
error = compat_do_execve(filename->name, argv, envp, regs);
putname(filename);
if (error == 0)
single_step_execve();

4
arch/unicore32/kernel/sys.c
View file

@ -51,13 +51,13 @@ asmlinkage long __sys_execve(const char __user *filename,
struct pt_regs *regs)
{
int error;
char *fn;
struct filename *fn;
fn = getname(filename);
error = PTR_ERR(fn);
if (IS_ERR(fn))
goto out;
error = do_execve(fn, argv, envp, regs);
error = do_execve(fn->name, argv, envp, regs);
putname(fn);
out:
return error;

4
arch/xtensa/kernel/process.c
View file

@ -325,13 +325,13 @@ long xtensa_execve(const char __user *name,
struct pt_regs *regs)
{
long error;
char * filename;
struct filename *filename;
filename = getname(name);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename, argv, envp, regs);
error = do_execve(filename->name, argv, envp, regs);
putname(filename);
out:
return error;

12
fs/compat.c
View file

@ -780,16 +780,16 @@ asmlinkage long compat_sys_mount(const char __user * dev_name,
char *kernel_type;
unsigned long data_page;
char *kernel_dev;
char *dir_page;
struct filename *dir;
int retval;
retval = copy_mount_string(type, &kernel_type);
if (retval < 0)
goto out;
dir_page = getname(dir_name);
retval = PTR_ERR(dir_page);
if (IS_ERR(dir_page))
dir = getname(dir_name);
retval = PTR_ERR(dir);
if (IS_ERR(dir))
goto out1;
retval = copy_mount_string(dev_name, &kernel_dev);
@ -811,7 +811,7 @@ asmlinkage long compat_sys_mount(const char __user * dev_name,
}
}
retval = do_mount(kernel_dev, dir_page, kernel_type,
retval = do_mount(kernel_dev, dir->name, kernel_type,
flags, (void*)data_page);
out4:
@ -819,7 +819,7 @@ asmlinkage long compat_sys_mount(const char __user * dev_name,
out3:
kfree(kernel_dev);
out2:
putname(dir_page);
putname(dir);
out1:
kfree(kernel_type);
out:

4
fs/exec.c
View file

@ -116,7 +116,7 @@ static inline void put_binfmt(struct linux_binfmt * fmt)
SYSCALL_DEFINE1(uselib, const char __user *, library)
{
struct file *file;
char *tmp = getname(library);
struct filename *tmp = getname(library);
int error = PTR_ERR(tmp);
static const struct open_flags uselib_flags = {
.open_flag = O_LARGEFILE | O_RDONLY | __FMODE_EXEC,
@ -127,7 +127,7 @@ SYSCALL_DEFINE1(uselib, const char __user *, library)
if (IS_ERR(tmp))
goto out;
file = do_filp_open(AT_FDCWD, tmp, &uselib_flags, LOOKUP_FOLLOW);
file = do_filp_open(AT_FDCWD, tmp->name, &uselib_flags, LOOKUP_FOLLOW);
putname(tmp);
error = PTR_ERR(file);
if (IS_ERR(file))

4
fs/filesystems.c
View file

@ -124,7 +124,7 @@ EXPORT_SYMBOL(unregister_filesystem);
static int fs_index(const char __user * __name)
{
struct file_system_type * tmp;
char * name;
struct filename *name;
int err, index;
name = getname(__name);
@ -135,7 +135,7 @@ static int fs_index(const char __user * __name)
err = -EINVAL;
read_lock(&file_systems_lock);
for (tmp=file_systems, index=0 ; tmp ; tmp=tmp->next, index++) {
if (strcmp(tmp->name,name) == 0) {
if (strcmp(tmp->name, name->name) == 0) {
err = index;
break;
}

106
fs/namei.c
View file

@ -116,18 +116,37 @@
* POSIX.1 2.4: an empty pathname is invalid (ENOENT).
* PATH_MAX includes the nul terminator --RR.
*/
static char *getname_flags(const char __user *filename, int flags, int *empty)
void final_putname(struct filename *name)
{
char *result = __getname(), *err;
__putname(name->name);
kfree(name);
}
static struct filename *
getname_flags(const char __user *filename, int flags, int *empty)
{
struct filename *result, *err;
char *kname;
int len;
/* FIXME: create dedicated slabcache? */
result = kzalloc(sizeof(*result), GFP_KERNEL);
if (unlikely(!result))
return ERR_PTR(-ENOMEM);
len = strncpy_from_user(result, filename, PATH_MAX);
kname = __getname();
if (unlikely(!kname)) {
err = ERR_PTR(-ENOMEM);
goto error_free_name;
}
result->name = kname;
result->uptr = filename;
len = strncpy_from_user(kname, filename, PATH_MAX);
if (unlikely(len < 0)) {
err = ERR_PTR(len);
if (unlikely(len < 0))
goto error;
}
/* The empty path is special. */
if (unlikely(!len)) {
@ -145,22 +164,25 @@ static char *getname_flags(const char __user *filename, int flags, int *empty)
}
error:
__putname(result);
__putname(kname);
error_free_name:
kfree(result);
return err;
}
char *getname(const char __user * filename)
struct filename *
getname(const char __user * filename)
{
return getname_flags(filename, 0, NULL);
}
EXPORT_SYMBOL(getname);
#ifdef CONFIG_AUDITSYSCALL
void putname(const char *name)
void putname(struct filename *name)
{
if (unlikely(!audit_dummy_context()))
audit_putname(name);
else
__putname(name);
return audit_putname(name);
final_putname(name);
}
#endif
@ -2126,13 +2148,13 @@ int user_path_at_empty(int dfd, const char __user *name, unsigned flags,
struct path *path, int *empty)
{
struct nameidata nd;
char *tmp = getname_flags(name, flags, empty);
struct filename *tmp = getname_flags(name, flags, empty);
int err = PTR_ERR(tmp);
if (!IS_ERR(tmp)) {
BUG_ON(flags & LOOKUP_PARENT);
err = do_path_lookup(dfd, tmp, flags, &nd);
err = do_path_lookup(dfd, tmp->name, flags, &nd);
putname(tmp);
if (!err)
*path = nd.path;
@ -2146,22 +2168,22 @@ int user_path_at(int dfd, const char __user *name, unsigned flags,
return user_path_at_empty(dfd, name, flags, path, NULL);
}
static int user_path_parent(int dfd, const char __user *path,
struct nameidata *nd, char **name)
static struct filename *
user_path_parent(int dfd, const char __user *path, struct nameidata *nd)
{
char *s = getname(path);
struct filename *s = getname(path);
int error;
if (IS_ERR(s))
return PTR_ERR(s);
return s;
error = do_path_lookup(dfd, s, LOOKUP_PARENT, nd);
if (error)
error = do_path_lookup(dfd, s->name, LOOKUP_PARENT, nd);
if (error) {
putname(s);
else
*name = s;
return ERR_PTR(error);
}
return error;
return s;
}
/*
@ -3086,11 +3108,11 @@ EXPORT_SYMBOL(done_path_create);
struct dentry *user_path_create(int dfd, const char __user *pathname, struct path *path, int is_dir)
{
char *tmp = getname(pathname);
struct filename *tmp = getname(pathname);
struct dentry *res;
if (IS_ERR(tmp))
return ERR_CAST(tmp);
res = kern_path_create(dfd, tmp, path, is_dir);
res = kern_path_create(dfd, tmp->name, path, is_dir);
putname(tmp);
return res;
}
@ -3317,13 +3339,13 @@ EXPORT_SYMBOL(vfs_rmdir);
static long do_rmdir(int dfd, const char __user *pathname)
{
int error = 0;
char * name;
struct filename *name;
struct dentry *dentry;
struct nameidata nd;
error = user_path_parent(dfd, pathname, &nd, &name);
if (error)
return error;
name = user_path_parent(dfd, pathname, &nd);
if (IS_ERR(name))
return PTR_ERR(name);
switch(nd.last_type) {
case LAST_DOTDOT:
@ -3419,14 +3441,14 @@ EXPORT_SYMBOL(vfs_unlink);
static long do_unlinkat(int dfd, const char __user *pathname)
{
int error;
char *name;
struct filename *name;
struct dentry *dentry;
struct nameidata nd;
struct inode *inode = NULL;
error = user_path_parent(dfd, pathname, &nd, &name);
if (error)
return error;
name = user_path_parent(dfd, pathname, &nd);
if (IS_ERR(name))
return PTR_ERR(name);
error = -EISDIR;
if (nd.last_type != LAST_NORM)
@ -3517,7 +3539,7 @@ SYSCALL_DEFINE3(symlinkat, const char __user *, oldname,
int, newdfd, const char __user *, newname)
{
int error;
char *from;
struct filename *from;
struct dentry *dentry;
struct path path;
@ -3530,9 +3552,9 @@ SYSCALL_DEFINE3(symlinkat, const char __user *, oldname,
if (IS_ERR(dentry))
goto out_putname;
error = security_path_symlink(&path, dentry, from);
error = security_path_symlink(&path, dentry, from->name);
if (!error)
error = vfs_symlink2(path.mnt, path.dentry->d_inode, dentry, from);
error = vfs_symlink2(path.mnt, path.dentry->d_inode, dentry, from->name);
done_path_create(&path, dentry);
out_putname:
putname(from);
@ -3829,17 +3851,21 @@ SYSCALL_DEFINE4(renameat, int, olddfd, const char __user *, oldname,
struct dentry *old_dentry, *new_dentry;
struct dentry *trap;
struct nameidata oldnd, newnd;
char *from;
char *to;
struct filename *from;
struct filename *to;
int error;
error = user_path_parent(olddfd, oldname, &oldnd, &from);
if (error)
from = user_path_parent(olddfd, oldname, &oldnd);
if (IS_ERR(from)) {
error = PTR_ERR(from);
goto exit;
}
error = user_path_parent(newdfd, newname, &newnd, &to);
if (error)
to = user_path_parent(newdfd, newname, &newnd);
if (IS_ERR(to)) {
error = PTR_ERR(to);
goto exit1;
}
error = -EXDEV;
if (oldnd.path.mnt != newnd.path.mnt)

4
fs/namespace.c
View file

@ -2445,7 +2445,7 @@ SYSCALL_DEFINE5(mount, char __user *, dev_name, char __user *, dir_name,
{
int ret;
char *kernel_type;
char *kernel_dir;
struct filename *kernel_dir;
char *kernel_dev;
unsigned long data_page;
@ -2467,7 +2467,7 @@ SYSCALL_DEFINE5(mount, char __user *, dev_name, char __user *, dir_name,
if (ret < 0)
goto out_data;
ret = do_mount(kernel_dev, kernel_dir, kernel_type, flags,
ret = do_mount(kernel_dev, kernel_dir->name, kernel_type, flags,
(void *) data_page);
free_page(data_page);

4
fs/open.c
View file

@ -992,13 +992,13 @@ long do_sys_open(int dfd, const char __user *filename, int flags, umode_t mode)
{
struct open_flags op;
int lookup = build_open_flags(flags, mode, &op);
char *tmp = getname(filename);
struct filename *tmp = getname(filename);
int fd = PTR_ERR(tmp);
if (!IS_ERR(tmp)) {
fd = get_unused_fd_flags(flags);
if (fd >= 0) {
struct file *f = do_filp_open(dfd, tmp, &op, lookup);
struct file *f = do_filp_open(dfd, tmp->name, &op, lookup);
if (IS_ERR(f)) {
put_unused_fd(fd);
fd = PTR_ERR(f);

4
fs/quota/quota.c
View file

@ -315,11 +315,11 @@ static struct super_block *quotactl_block(const char __user *special, int cmd)
#ifdef CONFIG_BLOCK
struct block_device *bdev;
struct super_block *sb;
char *tmp = getname(special);
struct filename *tmp = getname(special);
if (IS_ERR(tmp))
return ERR_CAST(tmp);
bdev = lookup_bdev(tmp);
bdev = lookup_bdev(tmp->name);
putname(tmp);
if (IS_ERR(bdev))
return ERR_CAST(bdev);

9
include/linux/audit.h
View file

@ -450,6 +450,9 @@ struct audit_field {
extern int __init audit_register_class(int class, unsigned *list);
extern int audit_classify_syscall(int abi, unsigned syscall);
extern int audit_classify_arch(int arch);
struct filename;
#ifdef CONFIG_AUDITSYSCALL
/* These are defined in auditsc.c */
/* Public API */
@ -459,8 +462,8 @@ extern void __audit_syscall_entry(int arch,
int major, unsigned long a0, unsigned long a1,
unsigned long a2, unsigned long a3);
extern void __audit_syscall_exit(int ret_success, long ret_value);
extern void __audit_getname(const char *name);
extern void audit_putname(const char *name);
extern void __audit_getname(struct filename *name);
extern void audit_putname(struct filename *name);
extern void __audit_inode(const char *name, const struct dentry *dentry);
extern void __audit_inode_child(const struct dentry *dentry,
const struct inode *parent);
@ -493,7 +496,7 @@ static inline void audit_syscall_exit(void *pt_regs)
__audit_syscall_exit(success, return_code);
}
}
static inline void audit_getname(const char *name)
static inline void audit_getname(struct filename *name)
{
if (unlikely(!audit_dummy_context()))
__audit_getname(name);

14
include/linux/fs.h
View file

@ -2085,6 +2085,10 @@ static inline int break_lease(struct inode *inode, unsigned int mode)
#endif /* CONFIG_FILE_LOCKING */
/* fs/open.c */
struct filename {
const char *name; /* pointer to actual string */
const __user char *uptr; /* original userland pointer */
};
extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
struct file *filp);
@ -2100,7 +2104,9 @@ extern struct file *file_open_root(struct dentry *, struct vfsmount *,
extern struct file * dentry_open(struct dentry *, struct vfsmount *, int,
const struct cred *);
extern int filp_close(struct file *, fl_owner_t id);
extern char * getname(const char __user *);
extern struct filename *getname(const char __user *);
enum {
FILE_CREATED = 1,
FILE_OPENED = 2
@ -2120,13 +2126,15 @@ extern void __init vfs_caches_init(unsigned long);
extern struct kmem_cache *names_cachep;
extern void final_putname(struct filename *name);
#define __getname_gfp(gfp) kmem_cache_alloc(names_cachep, (gfp))
#define __getname() __getname_gfp(GFP_KERNEL)
#define __putname(name) kmem_cache_free(names_cachep, (void *)(name))
#ifndef CONFIG_AUDITSYSCALL
#define putname(name) __putname(name)
#define putname(name) final_putname(name)
#else
extern void putname(const char *name);
extern void putname(struct filename *name);
#endif
#ifdef CONFIG_BLOCK

12
ipc/mqueue.c
View file

@ -678,7 +678,7 @@ SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, umode_t, mode,
{
struct dentry *dentry;
struct file *filp;
char *name;
struct filename *name;
struct mq_attr attr;
int fd, error;
struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
@ -696,7 +696,7 @@ SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, umode_t, mode,
goto out_putname;
mutex_lock(&ipc_ns->mq_mnt->mnt_root->d_inode->i_mutex);
dentry = lookup_one_len2(name, ipc_ns->mq_mnt, ipc_ns->mq_mnt->mnt_root, strlen(name));
dentry = lookup_one_len2(name->name, ipc_ns->mq_mnt, ipc_ns->mq_mnt->mnt_root, strlen(name));
if (IS_ERR(dentry)) {
error = PTR_ERR(dentry);
goto out_putfd;
@ -705,7 +705,7 @@ SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, umode_t, mode,
if (oflag & O_CREAT) {
if (dentry->d_inode) { /* entry already exists */
audit_inode(name, dentry);
audit_inode(name->name, path.dentry);
if (oflag & O_EXCL) {
error = -EEXIST;
goto out;
@ -721,7 +721,7 @@ SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, umode_t, mode,
error = -ENOENT;
goto out;
}
audit_inode(name, dentry);
audit_inode(name->name, path.dentry);
filp = do_open(ipc_ns, dentry, oflag);
}
@ -749,7 +749,7 @@ out_putname:
SYSCALL_DEFINE1(mq_unlink, const char __user *, u_name)
{
int err;
char *name;
struct filename *name;
struct dentry *dentry;
struct inode *inode = NULL;
struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
@ -760,7 +760,7 @@ SYSCALL_DEFINE1(mq_unlink, const char __user *, u_name)
mutex_lock_nested(&ipc_ns->mq_mnt->mnt_root->d_inode->i_mutex,
I_MUTEX_PARENT);
dentry = lookup_one_len2(name, ipc_ns->mq_mnt, ipc_ns->mq_mnt->mnt_root,
dentry = lookup_one_len2(name->name, ipc_ns->mq_mnt, ipc_ns->mq_mnt->mnt_root,
strlen(name));
if (IS_ERR(dentry)) {
err = PTR_ERR(dentry);

4
kernel/acct.c
View file

@ -260,10 +260,10 @@ SYSCALL_DEFINE1(acct, const char __user *, name)
return -EPERM;
if (name) {
char *tmp = getname(name);
struct filename *tmp = getname(name);
if (IS_ERR(tmp))
return (PTR_ERR(tmp));
error = acct_on(tmp);
error = acct_on(tmp->name);
putname(tmp);
} else {
struct bsd_acct_struct *acct;

41
kernel/auditsc.c
View file

@ -108,10 +108,11 @@ struct audit_cap_data {
* we don't let putname() free it (instead we free all of the saved
* pointers at syscall exit time).
*
* Further, in fs/namei.c:path_lookup() we store the inode and device. */
* Further, in fs/namei.c:path_lookup() we store the inode and device.
*/
struct audit_names {
struct list_head list; /* audit_context->names_list */
const char *name;
struct filename *name;
unsigned long ino;
dev_t dev;
umode_t mode;
@ -122,6 +123,7 @@ struct audit_names {
struct audit_cap_data fcap;
unsigned int fcap_ver;
int name_len; /* number of name's characters to log */
unsigned char type; /* record type */
bool name_put; /* call __putname() for this name */
/*
* This was an allocated audit_names and not from the array of
@ -1017,7 +1019,7 @@ static inline void audit_free_names(struct audit_context *context)
context->ino_count);
list_for_each_entry(n, &context->names_list, list) {
printk(KERN_ERR "names[%d] = %p = %s\n", i,
n->name, n->name ?: "(null)");
n->name, n->name->name ?: "(null)");
}
dump_stack();
return;
@ -1542,7 +1544,7 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
case AUDIT_NAME_FULL:
/* log the full path */
audit_log_format(ab, " name=");
audit_log_untrustedstring(ab, n->name);
audit_log_untrustedstring(ab, n->name->name);
break;
case 0:
/* name was specified as a relative path and the
@ -1552,7 +1554,7 @@ static void audit_log_name(struct audit_context *context, struct audit_names *n,
default:
/* log the name's directory component */
audit_log_format(ab, " name=");
audit_log_n_untrustedstring(ab, n->name,
audit_log_n_untrustedstring(ab, n->name->name,
n->name_len);
}
} else
@ -2046,7 +2048,7 @@ static struct audit_names *audit_alloc_name(struct audit_context *context)
* Add a name to the list of audit names for this context.
* Called from fs/namei.c:getname().
*/
void __audit_getname(const char *name)
void __audit_getname(struct filename *name)
{
struct audit_context *context = current->audit_context;
struct audit_names *n;
@ -2060,6 +2062,11 @@ void __audit_getname(const char *name)
return;
}
#if AUDIT_DEBUG
/* The filename _must_ have a populated ->name */
BUG_ON(!name->name);
#endif
n = audit_alloc_name(context);
if (!n)
return;
@ -2079,7 +2086,7 @@ void __audit_getname(const char *name)
* then we delay the putname until syscall exit.
* Called from include/linux/fs.h:putname().
*/
void audit_putname(const char *name)
void audit_putname(struct filename *name)
{
struct audit_context *context = current->audit_context;
@ -2094,7 +2101,7 @@ void audit_putname(const char *name)
list_for_each_entry(n, &context->names_list, list)
printk(KERN_ERR "name[%d] = %p = %s\n", i,
n->name, n->name ?: "(null)");
n->name, n->name->name ?: "(null)");
}
#endif
__putname(name);
@ -2108,8 +2115,8 @@ void audit_putname(const char *name)
" put_count=%d\n",
__FILE__, __LINE__,
context->serial, context->major,
context->in_syscall, name, context->name_count,
context->put_count);
context->in_syscall, name->name,
context->name_count, context->put_count);
dump_stack();
}
}
@ -2168,7 +2175,7 @@ void __audit_inode(const char *name, const struct dentry *dentry)
return;
list_for_each_entry_reverse(n, &context->names_list, list) {
if (n->name && (n->name == name))
if (n->name && (n->name->name == name))
goto out;
}
@ -2216,9 +2223,9 @@ void __audit_inode_child(const struct dentry *dentry,
continue;
if (n->ino == parent->i_ino &&
!audit_compare_dname_path(dname, n->name, &dirlen)) {
!audit_compare_dname_path(dname, n->name->name, &dirlen)) {
n->name_len = dirlen; /* update parent data in place */
found_parent = n->name;
found_parent = n->name->name;
goto add_names;
}
}
@ -2229,13 +2236,13 @@ void __audit_inode_child(const struct dentry *dentry,
continue;
/* strcmp() is the more likely scenario */
if (!strcmp(dname, n->name) ||
!audit_compare_dname_path(dname, n->name, &dirlen)) {
if (!strcmp(dname, n->name->name) ||
!audit_compare_dname_path(dname, n->name->name, &dirlen)) {
if (inode)
audit_copy_inode(n, NULL, inode);
else
n->ino = (unsigned long)-1;
found_child = n->name;
found_child = n->name->name;
goto add_names;
}
}
@ -2257,7 +2264,7 @@ add_names:
* directory. All names for this context are relinquished in
* audit_free_names() */
if (found_parent) {
n->name = found_parent;
n->name->name = found_parent;
n->name_len = AUDIT_NAME_FULL;
/* don't call __putname() */
n->name_put = false;

11
mm/swapfile.c
View file

@ -1565,7 +1565,7 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
struct file *swap_file, *victim;
struct address_space *mapping;
struct inode *inode;
char *pathname;
struct filename *pathname;
int oom_score_adj;
int i, type, prev;
int err;
@ -1580,8 +1580,7 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
if (IS_ERR(pathname))
goto out;
victim = filp_open(pathname, O_RDWR|O_LARGEFILE, 0);
putname(pathname);
victim = filp_open(pathname->name, O_RDWR|O_LARGEFILE, 0);
err = PTR_ERR(victim);
if (IS_ERR(victim))
goto out;
@ -2016,7 +2015,7 @@ static int setup_swap_map_and_extents(struct swap_info_struct *p,
SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
{
struct swap_info_struct *p;
char *name;
struct filename *name;
struct file *swap_file = NULL;
struct address_space *mapping;
int i;
@ -2046,7 +2045,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
name = NULL;
goto bad_swap;
}
swap_file = filp_open(name, O_RDWR|O_LARGEFILE, 0);
swap_file = filp_open(name->name, O_RDWR|O_LARGEFILE, 0);
if (IS_ERR(swap_file)) {
error = PTR_ERR(swap_file);
swap_file = NULL;
@ -2129,7 +2128,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
printk(KERN_INFO "Adding %uk swap on %s. "
"Priority:%d extents:%d across:%lluk %s%s\n",
p->pages<<(PAGE_SHIFT-10), name, p->prio,
p->pages<<(PAGE_SHIFT-10), name->name, p->prio,
nr_extents, (unsigned long long)span<<(PAGE_SHIFT-10),
(p->flags & SWP_SOLIDSTATE) ? "SS" : "",
(p->flags & SWP_DISCARDABLE) ? "D" : "");