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-rw-r--r--fs/f2fs/Makefile1
-rw-r--r--fs/f2fs/data.c75
-rw-r--r--fs/f2fs/f2fs.h20
-rw-r--r--fs/f2fs/file.c120
-rw-r--r--fs/f2fs/inode.c5
-rw-r--r--fs/f2fs/super.c5
-rw-r--r--fs/f2fs/sysfs.c11
-rw-r--r--fs/f2fs/verity.c247
-rw-r--r--fs/f2fs/xattr.h2
9 files changed, 463 insertions, 23 deletions
diff --git a/fs/f2fs/Makefile b/fs/f2fs/Makefile
index 776c4b936504..2aaecc63834f 100644
--- a/fs/f2fs/Makefile
+++ b/fs/f2fs/Makefile
@@ -8,3 +8,4 @@ f2fs-$(CONFIG_F2FS_STAT_FS) += debug.o
f2fs-$(CONFIG_F2FS_FS_XATTR) += xattr.o
f2fs-$(CONFIG_F2FS_FS_POSIX_ACL) += acl.o
f2fs-$(CONFIG_F2FS_IO_TRACE) += trace.o
+f2fs-$(CONFIG_FS_VERITY) += verity.o
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index adc64d514b79..5755e897a5f0 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -74,6 +74,7 @@ static enum count_type __read_io_type(struct page *page)
enum bio_post_read_step {
STEP_INITIAL = 0,
STEP_DECRYPT,
+ STEP_VERITY,
};
struct bio_post_read_ctx {
@@ -120,8 +121,23 @@ static void decrypt_work(struct work_struct *work)
bio_post_read_processing(ctx);
}
+static void verity_work(struct work_struct *work)
+{
+ struct bio_post_read_ctx *ctx =
+ container_of(work, struct bio_post_read_ctx, work);
+
+ fsverity_verify_bio(ctx->bio);
+
+ bio_post_read_processing(ctx);
+}
+
static void bio_post_read_processing(struct bio_post_read_ctx *ctx)
{
+ /*
+ * We use different work queues for decryption and for verity because
+ * verity may require reading metadata pages that need decryption, and
+ * we shouldn't recurse to the same workqueue.
+ */
switch (++ctx->cur_step) {
case STEP_DECRYPT:
if (ctx->enabled_steps & (1 << STEP_DECRYPT)) {
@@ -131,6 +147,14 @@ static void bio_post_read_processing(struct bio_post_read_ctx *ctx)
}
ctx->cur_step++;
/* fall-through */
+ case STEP_VERITY:
+ if (ctx->enabled_steps & (1 << STEP_VERITY)) {
+ INIT_WORK(&ctx->work, verity_work);
+ fsverity_enqueue_verify_work(&ctx->work);
+ return;
+ }
+ ctx->cur_step++;
+ /* fall-through */
default:
__read_end_io(ctx->bio);
}
@@ -643,8 +667,15 @@ out:
up_write(&io->io_rwsem);
}
+static inline bool f2fs_need_verity(const struct inode *inode, pgoff_t idx)
+{
+ return fsverity_active(inode) &&
+ idx < DIV_ROUND_UP(inode->i_size, PAGE_SIZE);
+}
+
static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
- unsigned nr_pages, unsigned op_flag)
+ unsigned nr_pages, unsigned op_flag,
+ pgoff_t first_idx)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
struct bio *bio;
@@ -660,6 +691,10 @@ static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
if (f2fs_encrypted_file(inode))
post_read_steps |= 1 << STEP_DECRYPT;
+
+ if (f2fs_need_verity(inode, first_idx))
+ post_read_steps |= 1 << STEP_VERITY;
+
if (post_read_steps) {
ctx = mempool_alloc(bio_post_read_ctx_pool, GFP_NOFS);
if (!ctx) {
@@ -681,7 +716,7 @@ static int f2fs_submit_page_read(struct inode *inode, struct page *page,
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
struct bio *bio;
- bio = f2fs_grab_read_bio(inode, blkaddr, 1, 0);
+ bio = f2fs_grab_read_bio(inode, blkaddr, 1, 0, page->index);
if (IS_ERR(bio))
return PTR_ERR(bio);
@@ -1604,6 +1639,15 @@ out:
return ret;
}
+static inline loff_t f2fs_readpage_limit(struct inode *inode)
+{
+ if (IS_ENABLED(CONFIG_FS_VERITY) &&
+ (IS_VERITY(inode) || f2fs_verity_in_progress(inode)))
+ return inode->i_sb->s_maxbytes;
+
+ return i_size_read(inode);
+}
+
static int f2fs_read_single_page(struct inode *inode, struct page *page,
unsigned nr_pages,
struct f2fs_map_blocks *map,
@@ -1622,7 +1666,7 @@ static int f2fs_read_single_page(struct inode *inode, struct page *page,
block_in_file = (sector_t)page_index(page);
last_block = block_in_file + nr_pages;
- last_block_in_file = (i_size_read(inode) + blocksize - 1) >>
+ last_block_in_file = (f2fs_readpage_limit(inode) + blocksize - 1) >>
blkbits;
if (last_block > last_block_in_file)
last_block = last_block_in_file;
@@ -1667,6 +1711,11 @@ got_it:
} else {
zero_out:
zero_user_segment(page, 0, PAGE_SIZE);
+ if (f2fs_need_verity(inode, page->index) &&
+ !fsverity_verify_page(page)) {
+ ret = -EIO;
+ goto out;
+ }
if (!PageUptodate(page))
SetPageUptodate(page);
unlock_page(page);
@@ -1685,7 +1734,7 @@ submit_and_realloc:
}
if (bio == NULL) {
bio = f2fs_grab_read_bio(inode, block_nr, nr_pages,
- is_readahead ? REQ_RAHEAD : 0);
+ is_readahead ? REQ_RAHEAD : 0, page->index);
if (IS_ERR(bio)) {
ret = PTR_ERR(bio);
bio = NULL;
@@ -2087,7 +2136,7 @@ static int __write_data_page(struct page *page, bool *submitted,
if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
goto redirty_out;
- if (page->index < end_index)
+ if (page->index < end_index || f2fs_verity_in_progress(inode))
goto write;
/*
@@ -2462,7 +2511,8 @@ static void f2fs_write_failed(struct address_space *mapping, loff_t to)
struct inode *inode = mapping->host;
loff_t i_size = i_size_read(inode);
- if (to > i_size) {
+ /* In the fs-verity case, f2fs_end_enable_verity() does the truncate */
+ if (to > i_size && !f2fs_verity_in_progress(inode)) {
down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
down_write(&F2FS_I(inode)->i_mmap_sem);
@@ -2493,7 +2543,8 @@ static int prepare_write_begin(struct f2fs_sb_info *sbi,
* the block addresses when there is no need to fill the page.
*/
if (!f2fs_has_inline_data(inode) && len == PAGE_SIZE &&
- !is_inode_flag_set(inode, FI_NO_PREALLOC))
+ !is_inode_flag_set(inode, FI_NO_PREALLOC) &&
+ !f2fs_verity_in_progress(inode))
return 0;
/* f2fs_lock_op avoids race between write CP and convert_inline_page */
@@ -2633,7 +2684,8 @@ repeat:
if (len == PAGE_SIZE || PageUptodate(page))
return 0;
- if (!(pos & (PAGE_SIZE - 1)) && (pos + len) >= i_size_read(inode)) {
+ if (!(pos & (PAGE_SIZE - 1)) && (pos + len) >= i_size_read(inode) &&
+ !f2fs_verity_in_progress(inode)) {
zero_user_segment(page, len, PAGE_SIZE);
return 0;
}
@@ -2696,7 +2748,8 @@ static int f2fs_write_end(struct file *file,
set_page_dirty(page);
- if (pos + copied > i_size_read(inode))
+ if (pos + copied > i_size_read(inode) &&
+ !f2fs_verity_in_progress(inode))
f2fs_i_size_write(inode, pos + copied);
unlock_out:
f2fs_put_page(page, 1);
@@ -3140,7 +3193,9 @@ void f2fs_clear_page_cache_dirty_tag(struct page *page)
int __init f2fs_init_post_read_processing(void)
{
- bio_post_read_ctx_cache = KMEM_CACHE(bio_post_read_ctx, 0);
+ bio_post_read_ctx_cache =
+ kmem_cache_create("f2fs_bio_post_read_ctx",
+ sizeof(struct bio_post_read_ctx), 0, 0, NULL);
if (!bio_post_read_ctx_cache)
goto fail;
bio_post_read_ctx_pool =
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 11c5a6d9f849..4024790028aa 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -25,6 +25,7 @@
#include <crypto/hash.h>
#include <linux/fscrypt.h>
+#include <linux/fsverity.h>
#ifdef CONFIG_F2FS_CHECK_FS
#define f2fs_bug_on(sbi, condition) BUG_ON(condition)
@@ -151,7 +152,7 @@ struct f2fs_mount_info {
#define F2FS_FEATURE_QUOTA_INO 0x0080
#define F2FS_FEATURE_INODE_CRTIME 0x0100
#define F2FS_FEATURE_LOST_FOUND 0x0200
-#define F2FS_FEATURE_VERITY 0x0400 /* reserved */
+#define F2FS_FEATURE_VERITY 0x0400
#define F2FS_FEATURE_SB_CHKSUM 0x0800
#define F2FS_FEATURE_CASEFOLD 0x1000
@@ -634,7 +635,7 @@ enum {
#define FADVISE_ENC_NAME_BIT 0x08
#define FADVISE_KEEP_SIZE_BIT 0x10
#define FADVISE_HOT_BIT 0x20
-#define FADVISE_VERITY_BIT 0x40 /* reserved */
+#define FADVISE_VERITY_BIT 0x40
#define FADVISE_MODIFIABLE_BITS (FADVISE_COLD_BIT | FADVISE_HOT_BIT)
@@ -654,6 +655,8 @@ enum {
#define file_is_hot(inode) is_file(inode, FADVISE_HOT_BIT)
#define file_set_hot(inode) set_file(inode, FADVISE_HOT_BIT)
#define file_clear_hot(inode) clear_file(inode, FADVISE_HOT_BIT)
+#define file_is_verity(inode) is_file(inode, FADVISE_VERITY_BIT)
+#define file_set_verity(inode) set_file(inode, FADVISE_VERITY_BIT)
#define DEF_DIR_LEVEL 0
@@ -2427,6 +2430,7 @@ enum {
FI_PROJ_INHERIT, /* indicate file inherits projectid */
FI_PIN_FILE, /* indicate file should not be gced */
FI_ATOMIC_REVOKE_REQUEST, /* request to drop atomic data */
+ FI_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */
};
static inline void __mark_inode_dirty_flag(struct inode *inode,
@@ -2466,6 +2470,12 @@ static inline void clear_inode_flag(struct inode *inode, int flag)
__mark_inode_dirty_flag(inode, flag, false);
}
+static inline bool f2fs_verity_in_progress(struct inode *inode)
+{
+ return IS_ENABLED(CONFIG_FS_VERITY) &&
+ is_inode_flag_set(inode, FI_VERITY_IN_PROGRESS);
+}
+
static inline void set_acl_inode(struct inode *inode, umode_t mode)
{
F2FS_I(inode)->i_acl_mode = mode;
@@ -3544,6 +3554,9 @@ void f2fs_exit_sysfs(void);
int f2fs_register_sysfs(struct f2fs_sb_info *sbi);
void f2fs_unregister_sysfs(struct f2fs_sb_info *sbi);
+/* verity.c */
+extern const struct fsverity_operations f2fs_verityops;
+
/*
* crypto support
*/
@@ -3566,7 +3579,7 @@ static inline void f2fs_set_encrypted_inode(struct inode *inode)
*/
static inline bool f2fs_post_read_required(struct inode *inode)
{
- return f2fs_encrypted_file(inode);
+ return f2fs_encrypted_file(inode) || fsverity_active(inode);
}
#define F2FS_FEATURE_FUNCS(name, flagname) \
@@ -3584,6 +3597,7 @@ F2FS_FEATURE_FUNCS(flexible_inline_xattr, FLEXIBLE_INLINE_XATTR);
F2FS_FEATURE_FUNCS(quota_ino, QUOTA_INO);
F2FS_FEATURE_FUNCS(inode_crtime, INODE_CRTIME);
F2FS_FEATURE_FUNCS(lost_found, LOST_FOUND);
+F2FS_FEATURE_FUNCS(verity, VERITY);
F2FS_FEATURE_FUNCS(sb_chksum, SB_CHKSUM);
F2FS_FEATURE_FUNCS(casefold, CASEFOLD);
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index e4b78fb3fc79..29bc0a542759 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -502,6 +502,10 @@ static int f2fs_file_open(struct inode *inode, struct file *filp)
if (err)
return err;
+ err = fsverity_file_open(inode, filp);
+ if (err)
+ return err;
+
filp->f_mode |= FMODE_NOWAIT;
return dquot_file_open(inode, filp);
@@ -747,15 +751,18 @@ static void __setattr_copy(struct inode *inode, const struct iattr *attr)
inode->i_uid = attr->ia_uid;
if (ia_valid & ATTR_GID)
inode->i_gid = attr->ia_gid;
- if (ia_valid & ATTR_ATIME)
- inode->i_atime = timespec64_trunc(attr->ia_atime,
- inode->i_sb->s_time_gran);
- if (ia_valid & ATTR_MTIME)
- inode->i_mtime = timespec64_trunc(attr->ia_mtime,
- inode->i_sb->s_time_gran);
- if (ia_valid & ATTR_CTIME)
- inode->i_ctime = timespec64_trunc(attr->ia_ctime,
- inode->i_sb->s_time_gran);
+ if (ia_valid & ATTR_ATIME) {
+ inode->i_atime = timestamp_truncate(attr->ia_atime,
+ inode);
+ }
+ if (ia_valid & ATTR_MTIME) {
+ inode->i_mtime = timestamp_truncate(attr->ia_mtime,
+ inode);
+ }
+ if (ia_valid & ATTR_CTIME) {
+ inode->i_ctime = timestamp_truncate(attr->ia_ctime,
+ inode);
+ }
if (ia_valid & ATTR_MODE) {
umode_t mode = attr->ia_mode;
@@ -784,6 +791,10 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
if (err)
return err;
+ err = fsverity_prepare_setattr(dentry, attr);
+ if (err)
+ return err;
+
if (is_quota_modification(inode, attr)) {
err = dquot_initialize(inode);
if (err)
@@ -1722,6 +1733,7 @@ static const struct {
FS_ENCRYPT_FL | \
FS_INLINE_DATA_FL | \
FS_NOCOW_FL | \
+ FS_VERITY_FL | \
FS_CASEFOLD_FL)
#define F2FS_SETTABLE_FS_FL ( \
@@ -1768,6 +1780,8 @@ static int f2fs_ioc_getflags(struct file *filp, unsigned long arg)
if (IS_ENCRYPTED(inode))
fsflags |= FS_ENCRYPT_FL;
+ if (IS_VERITY(inode))
+ fsflags |= FS_VERITY_FL;
if (f2fs_has_inline_data(inode) || f2fs_has_inline_dentry(inode))
fsflags |= FS_INLINE_DATA_FL;
if (is_inode_flag_set(inode, FI_PIN_FILE))
@@ -2210,6 +2224,49 @@ out_err:
return err;
}
+static int f2fs_ioc_get_encryption_policy_ex(struct file *filp,
+ unsigned long arg)
+{
+ if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
+ return -EOPNOTSUPP;
+
+ return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg);
+}
+
+static int f2fs_ioc_add_encryption_key(struct file *filp, unsigned long arg)
+{
+ if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
+ return -EOPNOTSUPP;
+
+ return fscrypt_ioctl_add_key(filp, (void __user *)arg);
+}
+
+static int f2fs_ioc_remove_encryption_key(struct file *filp, unsigned long arg)
+{
+ if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
+ return -EOPNOTSUPP;
+
+ return fscrypt_ioctl_remove_key(filp, (void __user *)arg);
+}
+
+static int f2fs_ioc_remove_encryption_key_all_users(struct file *filp,
+ unsigned long arg)
+{
+ if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
+ return -EOPNOTSUPP;
+
+ return fscrypt_ioctl_remove_key_all_users(filp, (void __user *)arg);
+}
+
+static int f2fs_ioc_get_encryption_key_status(struct file *filp,
+ unsigned long arg)
+{
+ if (!f2fs_sb_has_encrypt(F2FS_I_SB(file_inode(filp))))
+ return -EOPNOTSUPP;
+
+ return fscrypt_ioctl_get_key_status(filp, (void __user *)arg);
+}
+
static int f2fs_ioc_gc(struct file *filp, unsigned long arg)
{
struct inode *inode = file_inode(filp);
@@ -3088,6 +3145,30 @@ static int f2fs_ioc_resize_fs(struct file *filp, unsigned long arg)
return ret;
}
+static int f2fs_ioc_enable_verity(struct file *filp, unsigned long arg)
+{
+ struct inode *inode = file_inode(filp);
+
+ f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
+
+ if (!f2fs_sb_has_verity(F2FS_I_SB(inode))) {
+ f2fs_warn(F2FS_I_SB(inode),
+ "Can't enable fs-verity on inode %lu: the verity feature is not enabled on this filesystem.\n",
+ inode->i_ino);
+ return -EOPNOTSUPP;
+ }
+
+ return fsverity_ioctl_enable(filp, (const void __user *)arg);
+}
+
+static int f2fs_ioc_measure_verity(struct file *filp, unsigned long arg)
+{
+ if (!f2fs_sb_has_verity(F2FS_I_SB(file_inode(filp))))
+ return -EOPNOTSUPP;
+
+ return fsverity_ioctl_measure(filp, (void __user *)arg);
+}
+
static int f2fs_get_volume_name(struct file *filp, unsigned long arg)
{
struct inode *inode = file_inode(filp);
@@ -3184,6 +3265,16 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
return f2fs_ioc_get_encryption_policy(filp, arg);
case F2FS_IOC_GET_ENCRYPTION_PWSALT:
return f2fs_ioc_get_encryption_pwsalt(filp, arg);
+ case FS_IOC_GET_ENCRYPTION_POLICY_EX:
+ return f2fs_ioc_get_encryption_policy_ex(filp, arg);
+ case FS_IOC_ADD_ENCRYPTION_KEY:
+ return f2fs_ioc_add_encryption_key(filp, arg);
+ case FS_IOC_REMOVE_ENCRYPTION_KEY:
+ return f2fs_ioc_remove_encryption_key(filp, arg);
+ case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
+ return f2fs_ioc_remove_encryption_key_all_users(filp, arg);
+ case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
+ return f2fs_ioc_get_encryption_key_status(filp, arg);
case F2FS_IOC_GARBAGE_COLLECT:
return f2fs_ioc_gc(filp, arg);
case F2FS_IOC_GARBAGE_COLLECT_RANGE:
@@ -3210,6 +3301,10 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
return f2fs_ioc_precache_extents(filp, arg);
case F2FS_IOC_RESIZE_FS:
return f2fs_ioc_resize_fs(filp, arg);
+ case FS_IOC_ENABLE_VERITY:
+ return f2fs_ioc_enable_verity(filp, arg);
+ case FS_IOC_MEASURE_VERITY:
+ return f2fs_ioc_measure_verity(filp, arg);
case F2FS_IOC_GET_VOLUME_NAME:
return f2fs_get_volume_name(filp, arg);
case F2FS_IOC_SET_VOLUME_NAME:
@@ -3311,6 +3406,11 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case F2FS_IOC_SET_ENCRYPTION_POLICY:
case F2FS_IOC_GET_ENCRYPTION_PWSALT:
case F2FS_IOC_GET_ENCRYPTION_POLICY:
+ case FS_IOC_GET_ENCRYPTION_POLICY_EX:
+ case FS_IOC_ADD_ENCRYPTION_KEY:
+ case FS_IOC_REMOVE_ENCRYPTION_KEY:
+ case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
+ case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
case F2FS_IOC_GARBAGE_COLLECT:
case F2FS_IOC_GARBAGE_COLLECT_RANGE:
case F2FS_IOC_WRITE_CHECKPOINT:
@@ -3324,6 +3424,8 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case F2FS_IOC_SET_PIN_FILE:
case F2FS_IOC_PRECACHE_EXTENTS:
case F2FS_IOC_RESIZE_FS:
+ case FS_IOC_ENABLE_VERITY:
+ case FS_IOC_MEASURE_VERITY:
case F2FS_IOC_GET_VOLUME_NAME:
case F2FS_IOC_SET_VOLUME_NAME:
break;
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index 87214414936b..db4fec30c30d 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -46,11 +46,13 @@ void f2fs_set_inode_flags(struct inode *inode)
new_fl |= S_DIRSYNC;
if (file_is_encrypt(inode))
new_fl |= S_ENCRYPTED;
+ if (file_is_verity(inode))
+ new_fl |= S_VERITY;
if (flags & F2FS_CASEFOLD_FL)
new_fl |= S_CASEFOLD;
inode_set_flags(inode, new_fl,
S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|
- S_ENCRYPTED|S_CASEFOLD);
+ S_ENCRYPTED|S_VERITY|S_CASEFOLD);
}
static void __get_inode_rdev(struct inode *inode, struct f2fs_inode *ri)
@@ -736,6 +738,7 @@ no_delete:
}
out_clear:
fscrypt_put_encryption_info(inode);
+ fsverity_cleanup_inode(inode);
clear_inode(inode);
}
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 04788a6f9bcf..1443cee15863 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -965,6 +965,8 @@ static int f2fs_drop_inode(struct inode *inode)
return 0;
}
ret = generic_drop_inode(inode);
+ if (!ret)
+ ret = fscrypt_drop_inode(inode);
trace_f2fs_drop_inode(inode, ret);
return ret;
}
@@ -3278,6 +3280,9 @@ try_onemore:
#ifdef CONFIG_FS_ENCRYPTION
sb->s_cop = &f2fs_cryptops;
#endif
+#ifdef CONFIG_FS_VERITY
+ sb->s_vop = &f2fs_verityops;
+#endif
sb->s_xattr = f2fs_xattr_handlers;
sb->s_export_op = &f2fs_export_ops;
sb->s_magic = F2FS_SUPER_MAGIC;
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index f9fcca695db9..b558b64a4c9c 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -145,6 +145,9 @@ static ssize_t features_show(struct f2fs_attr *a,
if (f2fs_sb_has_lost_found(sbi))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "lost_found");
+ if (f2fs_sb_has_verity(sbi))
+ len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
+ len ? ", " : "", "verity");
if (f2fs_sb_has_sb_chksum(sbi))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "sb_checksum");
@@ -381,6 +384,7 @@ enum feat_id {
FEAT_QUOTA_INO,
FEAT_INODE_CRTIME,
FEAT_LOST_FOUND,
+ FEAT_VERITY,
FEAT_SB_CHECKSUM,
FEAT_CASEFOLD,
};
@@ -399,6 +403,7 @@ static ssize_t f2fs_feature_show(struct f2fs_attr *a,
case FEAT_QUOTA_INO:
case FEAT_INODE_CRTIME:
case FEAT_LOST_FOUND:
+ case FEAT_VERITY:
case FEAT_SB_CHECKSUM:
case FEAT_CASEFOLD:
return snprintf(buf, PAGE_SIZE, "supported\n");
@@ -490,6 +495,9 @@ F2FS_FEATURE_RO_ATTR(flexible_inline_xattr, FEAT_FLEXIBLE_INLINE_XATTR);
F2FS_FEATURE_RO_ATTR(quota_ino, FEAT_QUOTA_INO);
F2FS_FEATURE_RO_ATTR(inode_crtime, FEAT_INODE_CRTIME);
F2FS_FEATURE_RO_ATTR(lost_found, FEAT_LOST_FOUND);
+#ifdef CONFIG_FS_VERITY
+F2FS_FEATURE_RO_ATTR(verity, FEAT_VERITY);
+#endif
F2FS_FEATURE_RO_ATTR(sb_checksum, FEAT_SB_CHECKSUM);
F2FS_FEATURE_RO_ATTR(casefold, FEAT_CASEFOLD);
@@ -556,6 +564,9 @@ static struct attribute *f2fs_feat_attrs[] = {
ATTR_LIST(quota_ino),
ATTR_LIST(inode_crtime),
ATTR_LIST(lost_found),
+#ifdef CONFIG_FS_VERITY
+ ATTR_LIST(verity),
+#endif
ATTR_LIST(sb_checksum),
ATTR_LIST(casefold),
NULL,
diff --git a/fs/f2fs/verity.c b/fs/f2fs/verity.c
new file mode 100644
index 000000000000..a401ef72bc82
--- /dev/null
+++ b/fs/f2fs/verity.c
@@ -0,0 +1,247 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * fs/f2fs/verity.c: fs-verity support for f2fs
+ *
+ * Copyright 2019 Google LLC
+ */
+
+/*
+ * Implementation of fsverity_operations for f2fs.
+ *
+ * Like ext4, f2fs stores the verity metadata (Merkle tree and
+ * fsverity_descriptor) past the end of the file, starting at the first 64K
+ * boundary beyond i_size. This approach works because (a) verity files are
+ * readonly, and (b) pages fully beyond i_size aren't visible to userspace but
+ * can be read/written internally by f2fs with only some relatively small
+ * changes to f2fs. Extended attributes cannot be used because (a) f2fs limits
+ * the total size of an inode's xattr entries to 4096 bytes, which wouldn't be
+ * enough for even a single Merkle tree block, and (b) f2fs encryption doesn't
+ * encrypt xattrs, yet the verity metadata *must* be encrypted when the file is
+ * because it contains hashes of the plaintext data.
+ *
+ * Using a 64K boundary rather than a 4K one keeps things ready for
+ * architectures with 64K pages, and it doesn't necessarily waste space on-disk
+ * since there can be a hole between i_size and the start of the Merkle tree.
+ */
+
+#include <linux/f2fs_fs.h>
+
+#include "f2fs.h"
+#include "xattr.h"
+
+static inline loff_t f2fs_verity_metadata_pos(const struct inode *inode)
+{
+ return round_up(inode->i_size, 65536);
+}
+
+/*
+ * Read some verity metadata from the inode. __vfs_read() can't be used because
+ * we need to read beyond i_size.
+ */
+static int pagecache_read(struct inode *inode, void *buf, size_t count,
+ loff_t pos)
+{
+ while (count) {
+ size_t n = min_t(size_t, count,
+ PAGE_SIZE - offset_in_page(pos));
+ struct page *page;
+ void *addr;
+
+ page = read_mapping_page(inode->i_mapping, pos >> PAGE_SHIFT,
+ NULL);
+ if (IS_ERR(page))
+ return PTR_ERR(page);
+
+ addr = kmap_atomic(page);
+ memcpy(buf, addr + offset_in_page(pos), n);
+ kunmap_atomic(addr);
+
+ put_page(page);
+
+ buf += n;
+ pos += n;
+ count -= n;
+ }
+ return 0;
+}
+
+/*
+ * Write some verity metadata to the inode for FS_IOC_ENABLE_VERITY.
+ * kernel_write() can't be used because the file descriptor is readonly.
+ */
+static int pagecache_write(struct inode *inode, const void *buf, size_t count,
+ loff_t pos)
+{
+ if (pos + count > inode->i_sb->s_maxbytes)
+ return -EFBIG;
+
+ while (count) {
+ size_t n = min_t(size_t, count,
+ PAGE_SIZE - offset_in_page(pos));
+ struct page *page;
+ void *fsdata;
+ void *addr;
+ int res;
+
+ res = pagecache_write_begin(NULL, inode->i_mapping, pos, n, 0,
+ &page, &fsdata);
+ if (res)
+ return res;
+
+ addr = kmap_atomic(page);
+ memcpy(addr + offset_in_page(pos), buf, n);
+ kunmap_atomic(addr);
+
+ res = pagecache_write_end(NULL, inode->i_mapping, pos, n, n,
+ page, fsdata);
+ if (res < 0)
+ return res;
+ if (res != n)
+ return -EIO;
+
+ buf += n;
+ pos += n;
+ count -= n;
+ }
+ return 0;
+}
+
+/*
+ * Format of f2fs verity xattr. This points to the location of the verity
+ * descriptor within the file data rather than containing it directly because
+ * the verity descriptor *must* be encrypted when f2fs encryption is used. But,
+ * f2fs encryption does not encrypt xattrs.
+ */
+struct fsverity_descriptor_location {
+ __le32 version;
+ __le32 size;
+ __le64 pos;
+};
+
+static int f2fs_begin_enable_verity(struct file *filp)
+{
+ struct inode *inode = file_inode(filp);
+ int err;
+
+ if (f2fs_verity_in_progress(inode))
+ return -EBUSY;
+
+ if (f2fs_is_atomic_file(inode) || f2fs_is_volatile_file(inode))
+ return -EOPNOTSUPP;
+
+ /*
+ * Since the file was opened readonly, we have to initialize the quotas
+ * here and not rely on ->open() doing it. This must be done before
+ * evicting the inline data.
+ */
+ err = dquot_initialize(inode);
+ if (err)
+ return err;
+
+ err = f2fs_convert_inline_inode(inode);
+ if (err)
+ return err;
+
+ set_inode_flag(inode, FI_VERITY_IN_PROGRESS);
+ return 0;
+}
+
+static int f2fs_end_enable_verity(struct file *filp, const void *desc,
+ size_t desc_size, u64 merkle_tree_size)
+{
+ struct inode *inode = file_inode(filp);
+ u64 desc_pos = f2fs_verity_metadata_pos(inode) + merkle_tree_size;
+ struct fsverity_descriptor_location dloc = {
+ .version = cpu_to_le32(1),
+ .size = cpu_to_le32(desc_size),
+ .pos = cpu_to_le64(desc_pos),
+ };
+ int err = 0;
+
+ if (desc != NULL) {
+ /* Succeeded; write the verity descriptor. */
+ err = pagecache_write(inode, desc, desc_size, desc_pos);
+
+ /* Write all pages before clearing FI_VERITY_IN_PROGRESS. */
+ if (!err)
+ err = filemap_write_and_wait(inode->i_mapping);
+ }
+
+ /* If we failed, truncate anything we wrote past i_size. */
+ if (desc == NULL || err)
+ f2fs_truncate(inode);
+
+ clear_inode_flag(inode, FI_VERITY_IN_PROGRESS);
+
+ if (desc != NULL && !err) {
+ err = f2fs_setxattr(inode, F2FS_XATTR_INDEX_VERITY,
+ F2FS_XATTR_NAME_VERITY, &dloc, sizeof(dloc),
+ NULL, XATTR_CREATE);
+ if (!err) {
+ file_set_verity(inode);
+ f2fs_set_inode_flags(inode);
+ f2fs_mark_inode_dirty_sync(inode, true);
+ }
+ }
+ return err;
+}
+
+static int f2fs_get_verity_descriptor(struct inode *inode, void *buf,
+ size_t buf_size)
+{
+ struct fsverity_descriptor_location dloc;
+ int res;
+ u32 size;
+ u64 pos;
+
+ /* Get the descriptor location */
+ res = f2fs_getxattr(inode, F2FS_XATTR_INDEX_VERITY,
+ F2FS_XATTR_NAME_VERITY, &dloc, sizeof(dloc), NULL);
+ if (res < 0 && res != -ERANGE)
+ return res;
+ if (res != sizeof(dloc) || dloc.version != cpu_to_le32(1)) {
+ f2fs_warn(F2FS_I_SB(inode), "unknown verity xattr format");
+ return -EINVAL;
+ }
+ size = le32_to_cpu(dloc.size);
+ pos = le64_to_cpu(dloc.pos);
+
+ /* Get the descriptor */
+ if (pos + size < pos || pos + size > inode->i_sb->s_maxbytes ||
+ pos < f2fs_verity_metadata_pos(inode) || size > INT_MAX) {
+ f2fs_warn(F2FS_I_SB(inode), "invalid verity xattr");
+ return -EFSCORRUPTED;
+ }
+ if (buf_size) {
+ if (size > buf_size)
+ return -ERANGE;
+ res = pagecache_read(inode, buf, size, pos);
+ if (res)
+ return res;
+ }
+ return size;
+}
+
+static struct page *f2fs_read_merkle_tree_page(struct inode *inode,
+ pgoff_t index)
+{
+ index += f2fs_verity_metadata_pos(inode) >> PAGE_SHIFT;
+
+ return read_mapping_page(inode->i_mapping, index, NULL);
+}
+
+static int f2fs_write_merkle_tree_block(struct inode *inode, const void *buf,
+ u64 index, int log_blocksize)
+{
+ loff_t pos = f2fs_verity_metadata_pos(inode) + (index << log_blocksize);
+
+ return pagecache_write(inode, buf, 1 << log_blocksize, pos);
+}
+
+const struct fsverity_operations f2fs_verityops = {
+ .begin_enable_verity = f2fs_begin_enable_verity,
+ .end_enable_verity = f2fs_end_enable_verity,
+ .get_verity_descriptor = f2fs_get_verity_descriptor,
+ .read_merkle_tree_page = f2fs_read_merkle_tree_page,
+ .write_merkle_tree_block = f2fs_write_merkle_tree_block,
+};
diff --git a/fs/f2fs/xattr.h b/fs/f2fs/xattr.h
index a90920e2f949..de0c600b9cab 100644
--- a/fs/f2fs/xattr.h
+++ b/fs/f2fs/xattr.h
@@ -34,8 +34,10 @@
#define F2FS_XATTR_INDEX_ADVISE 7
/* Should be same as EXT4_XATTR_INDEX_ENCRYPTION */
#define F2FS_XATTR_INDEX_ENCRYPTION 9
+#define F2FS_XATTR_INDEX_VERITY 11
#define F2FS_XATTR_NAME_ENCRYPTION_CONTEXT "c"
+#define F2FS_XATTR_NAME_VERITY "v"
struct f2fs_xattr_header {
__le32 h_magic; /* magic number for identification */
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-19 00:52:35 +0300