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don't carry MAY_OPEN in op->acc_mode 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-12-26 22:33:24 -05:00
parent b40ef8696f
commit 62fb4a155f
3 changed files with 12 additions and 18 deletions
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4
fs/exec.c
View File

@ -119,7 +119,7 @@ SYSCALL_DEFINE1(uselib, const char __user *, library)
int error = PTR_ERR(tmp);
static const struct open_flags uselib_flags = {
.open_flag = O_LARGEFILE | O_RDONLY | __FMODE_EXEC,
.acc_mode = MAY_READ | MAY_EXEC | MAY_OPEN,
.acc_mode = MAY_READ | MAY_EXEC,
.intent = LOOKUP_OPEN,
.lookup_flags = LOOKUP_FOLLOW,
};
@ -763,7 +763,7 @@ static struct file *do_open_execat(int fd, struct filename *name, int flags)
int err;
struct open_flags open_exec_flags = {
.open_flag = O_LARGEFILE | O_RDONLY | __FMODE_EXEC,
.acc_mode = MAY_EXEC | MAY_OPEN,
.acc_mode = MAY_EXEC,
.intent = LOOKUP_OPEN,
.lookup_flags = LOOKUP_FOLLOW,
};

21
fs/namei.c
View File

@ -2663,10 +2663,6 @@ static int may_open(struct path *path, int acc_mode, int flag)
struct inode *inode = dentry->d_inode;
int error;
/* O_PATH? */
if (!acc_mode)
return 0;
if (!inode)
return -ENOENT;
@ -2688,7 +2684,7 @@ static int may_open(struct path *path, int acc_mode, int flag)
break;
}
error = inode_permission(inode, acc_mode);
error = inode_permission(inode, MAY_OPEN | acc_mode);
if (error)
return error;
@ -2880,7 +2876,7 @@ static int atomic_open(struct nameidata *nd, struct dentry *dentry,
if (*opened & FILE_CREATED) {
WARN_ON(!(open_flag & O_CREAT));
fsnotify_create(dir, dentry);
acc_mode = MAY_OPEN;
acc_mode = 0;
}
error = may_open(&file->f_path, acc_mode, open_flag);
if (error)
@ -3093,7 +3089,7 @@ static int do_last(struct nameidata *nd,
/* Don't check for write permission, don't truncate */
open_flag &= ~O_TRUNC;
will_truncate = false;
acc_mode = MAY_OPEN;
acc_mode = 0;
path_to_nameidata(&path, nd);
goto finish_open_created;
}
@ -3177,10 +3173,11 @@ static int do_last(struct nameidata *nd,
got_write = true;
}
finish_open_created:
error = may_open(&nd->path, acc_mode, open_flag);
if (error)
goto out;
if (likely(!(open_flag & O_PATH))) {
error = may_open(&nd->path, acc_mode, open_flag);
if (error)
goto out;
}
BUG_ON(*opened & FILE_OPENED); /* once it's opened, it's opened */
error = vfs_open(&nd->path, file, current_cred());
if (!error) {
@ -3267,7 +3264,7 @@ static int do_tmpfile(struct nameidata *nd, unsigned flags,
goto out2;
audit_inode(nd->name, child, 0);
/* Don't check for other permissions, the inode was just created */
error = may_open(&path, MAY_OPEN, op->open_flag);
error = may_open(&path, 0, op->open_flag);
if (error)
goto out2;
file->f_path.mnt = path.mnt;

5
fs/open.c
View File

@ -887,7 +887,7 @@ EXPORT_SYMBOL(dentry_open);
static inline int build_open_flags(int flags, umode_t mode, struct open_flags *op)
{
int lookup_flags = 0;
int acc_mode;
int acc_mode = ACC_MODE(flags);
if (flags & (O_CREAT | __O_TMPFILE))
op->mode = (mode & S_IALLUGO) | S_IFREG;
@ -909,7 +909,6 @@ static inline int build_open_flags(int flags, umode_t mode, struct open_flags *o
if (flags & __O_TMPFILE) {
if ((flags & O_TMPFILE_MASK) != O_TMPFILE)
return -EINVAL;
acc_mode = MAY_OPEN | ACC_MODE(flags);
if (!(acc_mode & MAY_WRITE))
return -EINVAL;
} else if (flags & O_PATH) {
@ -919,8 +918,6 @@ static inline int build_open_flags(int flags, umode_t mode, struct open_flags *o
*/
flags &= O_DIRECTORY | O_NOFOLLOW | O_PATH;
acc_mode = 0;
} else {
acc_mode = MAY_OPEN | ACC_MODE(flags);
}
op->open_flag = flags;