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-rw-r--r--fs/fat/file.c182
1 files changed, 94 insertions, 88 deletions
diff --git a/fs/fat/file.c b/fs/fat/file.c
index 6214287210f5..9b94094c7010 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -18,106 +18,112 @@
18#include <linux/security.h> 18#include <linux/security.h>
19#include "fat.h" 19#include "fat.h"
20 20
21int fat_generic_ioctl(struct inode *inode, struct file *filp, 21static int fat_ioctl_get_attributes(struct inode *inode, u32 __user *user_attr)
22 unsigned int cmd, unsigned long arg)
23{ 22{
23 u32 attr;
24
25 mutex_lock(&inode->i_mutex);
26 attr = fat_make_attrs(inode);
27 mutex_unlock(&inode->i_mutex);
28
29 return put_user(attr, user_attr);
30}
31
32static int fat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
33{
34 struct inode *inode = file->f_path.dentry->d_inode;
24 struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); 35 struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
25 u32 __user *user_attr = (u32 __user *)arg; 36 int is_dir = S_ISDIR(inode->i_mode);
37 u32 attr, oldattr;
38 struct iattr ia;
39 int err;
26 40
27 switch (cmd) { 41 err = get_user(attr, user_attr);
28 case FAT_IOCTL_GET_ATTRIBUTES: 42 if (err)
29 { 43 goto out;
30 u32 attr;
31 44
32 mutex_lock(&inode->i_mutex); 45 mutex_lock(&inode->i_mutex);
33 attr = fat_make_attrs(inode); 46 err = mnt_want_write(file->f_path.mnt);
34 mutex_unlock(&inode->i_mutex); 47 if (err)
48 goto out_unlock_inode;
35 49
36 return put_user(attr, user_attr); 50 /*
51 * ATTR_VOLUME and ATTR_DIR cannot be changed; this also
52 * prevents the user from turning us into a VFAT
53 * longname entry. Also, we obviously can't set
54 * any of the NTFS attributes in the high 24 bits.
55 */
56 attr &= 0xff & ~(ATTR_VOLUME | ATTR_DIR);
57 /* Merge in ATTR_VOLUME and ATTR_DIR */
58 attr |= (MSDOS_I(inode)->i_attrs & ATTR_VOLUME) |
59 (is_dir ? ATTR_DIR : 0);
60 oldattr = fat_make_attrs(inode);
61
62 /* Equivalent to a chmod() */
63 ia.ia_valid = ATTR_MODE | ATTR_CTIME;
64 ia.ia_ctime = current_fs_time(inode->i_sb);
65 if (is_dir)
66 ia.ia_mode = fat_make_mode(sbi, attr, S_IRWXUGO);
67 else {
68 ia.ia_mode = fat_make_mode(sbi, attr,
69 S_IRUGO | S_IWUGO | (inode->i_mode & S_IXUGO));
37 } 70 }
38 case FAT_IOCTL_SET_ATTRIBUTES:
39 {
40 u32 attr, oldattr;
41 int err, is_dir = S_ISDIR(inode->i_mode);
42 struct iattr ia;
43 71
44 err = get_user(attr, user_attr); 72 /* The root directory has no attributes */
45 if (err) 73 if (inode->i_ino == MSDOS_ROOT_INO && attr != ATTR_DIR) {
46 return err; 74 err = -EINVAL;
75 goto out_drop_write;
76 }
47 77
48 mutex_lock(&inode->i_mutex); 78 if (sbi->options.sys_immutable &&
49 79 ((attr | oldattr) & ATTR_SYS) &&
50 err = mnt_want_write(filp->f_path.mnt); 80 !capable(CAP_LINUX_IMMUTABLE)) {
51 if (err) 81 err = -EPERM;
52 goto up_no_drop_write; 82 goto out_drop_write;
53 83 }
54 /*
55 * ATTR_VOLUME and ATTR_DIR cannot be changed; this also
56 * prevents the user from turning us into a VFAT
57 * longname entry. Also, we obviously can't set
58 * any of the NTFS attributes in the high 24 bits.
59 */
60 attr &= 0xff & ~(ATTR_VOLUME | ATTR_DIR);
61 /* Merge in ATTR_VOLUME and ATTR_DIR */
62 attr |= (MSDOS_I(inode)->i_attrs & ATTR_VOLUME) |
63 (is_dir ? ATTR_DIR : 0);
64 oldattr = fat_make_attrs(inode);
65
66 /* Equivalent to a chmod() */
67 ia.ia_valid = ATTR_MODE | ATTR_CTIME;
68 ia.ia_ctime = current_fs_time(inode->i_sb);
69 if (is_dir)
70 ia.ia_mode = fat_make_mode(sbi, attr, S_IRWXUGO);
71 else {
72 ia.ia_mode = fat_make_mode(sbi, attr,
73 S_IRUGO | S_IWUGO | (inode->i_mode & S_IXUGO));
74 }
75 84
76 /* The root directory has no attributes */ 85 /*
77 if (inode->i_ino == MSDOS_ROOT_INO && attr != ATTR_DIR) { 86 * The security check is questionable... We single
78 err = -EINVAL; 87 * out the RO attribute for checking by the security
79 goto up; 88 * module, just because it maps to a file mode.
80 } 89 */
90 err = security_inode_setattr(file->f_path.dentry, &ia);
91 if (err)
92 goto out_drop_write;
81 93
82 if (sbi->options.sys_immutable) { 94 /* This MUST be done before doing anything irreversible... */
83 if ((attr | oldattr) & ATTR_SYS) { 95 err = fat_setattr(file->f_path.dentry, &ia);
84 if (!capable(CAP_LINUX_IMMUTABLE)) { 96 if (err)
85 err = -EPERM; 97 goto out_drop_write;
86 goto up; 98
87 } 99 fsnotify_change(file->f_path.dentry, ia.ia_valid);
88 } 100 if (sbi->options.sys_immutable) {
89 } 101 if (attr & ATTR_SYS)
102 inode->i_flags |= S_IMMUTABLE;
103 else
104 inode->i_flags &= S_IMMUTABLE;
105 }
90 106
91 /* 107 fat_save_attrs(inode, attr);
92 * The security check is questionable... We single 108 mark_inode_dirty(inode);
93 * out the RO attribute for checking by the security 109out_drop_write:
94 * module, just because it maps to a file mode. 110 mnt_drop_write(file->f_path.mnt);
95 */ 111out_unlock_inode:
96 err = security_inode_setattr(filp->f_path.dentry, &ia); 112 mutex_unlock(&inode->i_mutex);
97 if (err) 113out:
98 goto up; 114 return err;
99 115}
100 /* This MUST be done before doing anything irreversible... */
101 err = fat_setattr(filp->f_path.dentry, &ia);
102 if (err)
103 goto up;
104
105 fsnotify_change(filp->f_path.dentry, ia.ia_valid);
106 if (sbi->options.sys_immutable) {
107 if (attr & ATTR_SYS)
108 inode->i_flags |= S_IMMUTABLE;
109 else
110 inode->i_flags &= S_IMMUTABLE;
111 }
112 116
113 fat_save_attrs(inode, attr); 117int fat_generic_ioctl(struct inode *inode, struct file *filp,
114 mark_inode_dirty(inode); 118 unsigned int cmd, unsigned long arg)
115up: 119{
116 mnt_drop_write(filp->f_path.mnt); 120 u32 __user *user_attr = (u32 __user *)arg;
117up_no_drop_write: 121
118 mutex_unlock(&inode->i_mutex); 122 switch (cmd) {
119 return err; 123 case FAT_IOCTL_GET_ATTRIBUTES:
120 } 124 return fat_ioctl_get_attributes(inode, user_attr);
125 case FAT_IOCTL_SET_ATTRIBUTES:
126 return fat_ioctl_set_attributes(filp, user_attr);
121 default: 127 default:
122 return -ENOTTY; /* Inappropriate ioctl for device */ 128 return -ENOTTY; /* Inappropriate ioctl for device */
123 } 129 }
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-01 09:35:21 -0500