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-rw-r--r--fs/f2fs/crypto_fname.c2
-rw-r--r--fs/f2fs/crypto_policy.c65
-rw-r--r--fs/f2fs/dir.c32
-rw-r--r--fs/f2fs/f2fs.h3
-rw-r--r--fs/f2fs/hash.c7
-rw-r--r--fs/f2fs/inline.c4
-rw-r--r--fs/f2fs/segment.c9
-rw-r--r--fs/f2fs/super.c18
8 files changed, 107 insertions, 33 deletions
diff --git a/fs/f2fs/crypto_fname.c b/fs/f2fs/crypto_fname.c
index ab377d496a39..38349ed5ea51 100644
--- a/fs/f2fs/crypto_fname.c
+++ b/fs/f2fs/crypto_fname.c
@@ -333,7 +333,7 @@ int f2fs_fname_disk_to_usr(struct inode *inode,
memset(buf + 4, 0, 4);
} else
memset(buf, 0, 8);
- memcpy(buf + 8, iname->name + iname->len - 16, 16);
+ memcpy(buf + 8, iname->name + ((iname->len - 17) & ~15), 16);
oname->name[0] = '_';
ret = digest_encode(buf, 24, oname->name + 1);
oname->len = ret + 1;
diff --git a/fs/f2fs/crypto_policy.c b/fs/f2fs/crypto_policy.c
index 5bbd1989d5e6..884f3f0fe29d 100644
--- a/fs/f2fs/crypto_policy.c
+++ b/fs/f2fs/crypto_policy.c
@@ -141,25 +141,38 @@ int f2fs_get_policy(struct inode *inode, struct f2fs_encryption_policy *policy)
int f2fs_is_child_context_consistent_with_parent(struct inode *parent,
struct inode *child)
{
- struct f2fs_crypt_info *parent_ci, *child_ci;
+ const struct f2fs_crypt_info *parent_ci, *child_ci;
+ struct f2fs_encryption_context parent_ctx, child_ctx;
int res;
- if ((parent == NULL) || (child == NULL)) {
- pr_err("parent %p child %p\n", parent, child);
- BUG_ON(1);
- }
-
/* No restrictions on file types which are never encrypted */
if (!S_ISREG(child->i_mode) && !S_ISDIR(child->i_mode) &&
!S_ISLNK(child->i_mode))
return 1;
- /* no restrictions if the parent directory is not encrypted */
+ /* No restrictions if the parent directory is unencrypted */
if (!f2fs_encrypted_inode(parent))
return 1;
- /* if the child directory is not encrypted, this is always a problem */
+
+ /* Encrypted directories must not contain unencrypted files */
if (!f2fs_encrypted_inode(child))
return 0;
+
+ /*
+ * Both parent and child are encrypted, so verify they use the same
+ * encryption policy. Compare the fscrypt_info structs if the keys are
+ * available, otherwise retrieve and compare the fscrypt_contexts.
+ *
+ * Note that the fscrypt_context retrieval will be required frequently
+ * when accessing an encrypted directory tree without the key.
+ * Performance-wise this is not a big deal because we already don't
+ * really optimize for file access without the key (to the extent that
+ * such access is even possible), given that any attempted access
+ * already causes a fscrypt_context retrieval and keyring search.
+ *
+ * In any case, if an unexpected error occurs, fall back to "forbidden".
+ */
+
res = f2fs_get_encryption_info(parent);
if (res)
return 0;
@@ -168,17 +181,35 @@ int f2fs_is_child_context_consistent_with_parent(struct inode *parent,
return 0;
parent_ci = F2FS_I(parent)->i_crypt_info;
child_ci = F2FS_I(child)->i_crypt_info;
- if (!parent_ci && !child_ci)
- return 1;
- if (!parent_ci || !child_ci)
+ if (parent_ci && child_ci) {
+ return memcmp(parent_ci->ci_master_key, child_ci->ci_master_key,
+ F2FS_KEY_DESCRIPTOR_SIZE) == 0 &&
+ (parent_ci->ci_data_mode == child_ci->ci_data_mode) &&
+ (parent_ci->ci_filename_mode ==
+ child_ci->ci_filename_mode) &&
+ (parent_ci->ci_flags == child_ci->ci_flags);
+ }
+
+ res = f2fs_getxattr(parent, F2FS_XATTR_INDEX_ENCRYPTION,
+ F2FS_XATTR_NAME_ENCRYPTION_CONTEXT,
+ &parent_ctx, sizeof(parent_ctx), NULL);
+ if (res != sizeof(parent_ctx))
+ return 0;
+
+ res = f2fs_getxattr(child, F2FS_XATTR_INDEX_ENCRYPTION,
+ F2FS_XATTR_NAME_ENCRYPTION_CONTEXT,
+ &child_ctx, sizeof(child_ctx), NULL);
+ if (res != sizeof(child_ctx))
return 0;
- return (memcmp(parent_ci->ci_master_key,
- child_ci->ci_master_key,
- F2FS_KEY_DESCRIPTOR_SIZE) == 0 &&
- (parent_ci->ci_data_mode == child_ci->ci_data_mode) &&
- (parent_ci->ci_filename_mode == child_ci->ci_filename_mode) &&
- (parent_ci->ci_flags == child_ci->ci_flags));
+ return memcmp(parent_ctx.master_key_descriptor,
+ child_ctx.master_key_descriptor,
+ F2FS_KEY_DESCRIPTOR_SIZE) == 0 &&
+ (parent_ctx.contents_encryption_mode ==
+ child_ctx.contents_encryption_mode) &&
+ (parent_ctx.filenames_encryption_mode ==
+ child_ctx.filenames_encryption_mode) &&
+ (parent_ctx.flags == child_ctx.flags);
}
/**
diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 7c1678ba8f92..60972a559685 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -124,19 +124,29 @@ struct f2fs_dir_entry *find_target_dentry(struct f2fs_filename *fname,
de = &d->dentry[bit_pos];
- /* encrypted case */
+ if (de->hash_code != namehash)
+ goto not_match;
+
de_name.name = d->filename[bit_pos];
de_name.len = le16_to_cpu(de->name_len);
- /* show encrypted name */
- if (fname->hash) {
- if (de->hash_code == fname->hash)
- goto found;
- } else if (de_name.len == name->len &&
- de->hash_code == namehash &&
- !memcmp(de_name.name, name->name, name->len))
+#ifdef CONFIG_F2FS_FS_ENCRYPTION
+ if (unlikely(!name->name)) {
+ if (fname->usr_fname->name[0] == '_') {
+ if (de_name.len > 32 &&
+ !memcmp(de_name.name + ((de_name.len - 17) & ~15),
+ fname->crypto_buf.name + 8, 16))
+ goto found;
+ goto not_match;
+ }
+ name->name = fname->crypto_buf.name;
+ name->len = fname->crypto_buf.len;
+ }
+#endif
+ if (de_name.len == name->len &&
+ !memcmp(de_name.name, name->name, name->len))
goto found;
-
+not_match:
if (max_slots && max_len > *max_slots)
*max_slots = max_len;
max_len = 0;
@@ -170,7 +180,7 @@ static struct f2fs_dir_entry *find_in_level(struct inode *dir,
int max_slots;
f2fs_hash_t namehash;
- namehash = f2fs_dentry_hash(&name);
+ namehash = f2fs_dentry_hash(&name, fname);
f2fs_bug_on(F2FS_I_SB(dir), level > MAX_DIR_HASH_DEPTH);
@@ -547,7 +557,7 @@ int __f2fs_add_link(struct inode *dir, const struct qstr *name,
level = 0;
slots = GET_DENTRY_SLOTS(new_name.len);
- dentry_hash = f2fs_dentry_hash(&new_name);
+ dentry_hash = f2fs_dentry_hash(&new_name, NULL);
current_depth = F2FS_I(dir)->i_current_depth;
if (F2FS_I(dir)->chash == dentry_hash) {
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 3c7594b9d109..9dfbfe6dc775 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1723,7 +1723,8 @@ void f2fs_msg(struct super_block *, const char *, const char *, ...);
/*
* hash.c
*/
-f2fs_hash_t f2fs_dentry_hash(const struct qstr *);
+f2fs_hash_t f2fs_dentry_hash(const struct qstr *name_info,
+ struct f2fs_filename *fname);
/*
* node.c
diff --git a/fs/f2fs/hash.c b/fs/f2fs/hash.c
index 71b7206c431e..b238d2fec3e5 100644
--- a/fs/f2fs/hash.c
+++ b/fs/f2fs/hash.c
@@ -70,7 +70,8 @@ static void str2hashbuf(const unsigned char *msg, size_t len,
*buf++ = pad;
}
-f2fs_hash_t f2fs_dentry_hash(const struct qstr *name_info)
+f2fs_hash_t f2fs_dentry_hash(const struct qstr *name_info,
+ struct f2fs_filename *fname)
{
__u32 hash;
f2fs_hash_t f2fs_hash;
@@ -79,6 +80,10 @@ f2fs_hash_t f2fs_dentry_hash(const struct qstr *name_info)
const unsigned char *name = name_info->name;
size_t len = name_info->len;
+ /* encrypted bigname case */
+ if (fname && !fname->disk_name.name)
+ return cpu_to_le32(fname->hash);
+
if (is_dot_dotdot(name_info))
return 0;
diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
index dbb2cc4df603..f35f3eb3541f 100644
--- a/fs/f2fs/inline.c
+++ b/fs/f2fs/inline.c
@@ -321,7 +321,7 @@ struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir,
if (IS_ERR(ipage))
return NULL;
- namehash = f2fs_dentry_hash(&name);
+ namehash = f2fs_dentry_hash(&name, fname);
inline_dentry = inline_data_addr(ipage);
@@ -486,7 +486,7 @@ int f2fs_add_inline_entry(struct inode *dir, const struct qstr *name,
f2fs_wait_on_page_writeback(ipage, NODE);
- name_hash = f2fs_dentry_hash(name);
+ name_hash = f2fs_dentry_hash(name, NULL);
make_dentry_ptr(NULL, &d, (void *)dentry_blk, 2);
f2fs_update_dentry(ino, mode, &d, name, name_hash, bit_pos);
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index f77b3258454a..7965957dd0e6 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1623,6 +1623,10 @@ static int read_normal_summaries(struct f2fs_sb_info *sbi, int type)
static int restore_curseg_summaries(struct f2fs_sb_info *sbi)
{
+ struct f2fs_summary_block *s_sits =
+ CURSEG_I(sbi, CURSEG_COLD_DATA)->sum_blk;
+ struct f2fs_summary_block *s_nats =
+ CURSEG_I(sbi, CURSEG_HOT_DATA)->sum_blk;
int type = CURSEG_HOT_DATA;
int err;
@@ -1649,6 +1653,11 @@ static int restore_curseg_summaries(struct f2fs_sb_info *sbi)
return err;
}
+ /* sanity check for summary blocks */
+ if (nats_in_cursum(s_nats) > NAT_JOURNAL_ENTRIES ||
+ sits_in_cursum(s_sits) > SIT_JOURNAL_ENTRIES)
+ return -EINVAL;
+
return 0;
}
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index ba5e702b19b4..5d3e745d33ae 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1078,6 +1078,8 @@ static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
unsigned int total, fsmeta;
struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
+ unsigned int main_segs, blocks_per_seg;
+ int i;
total = le32_to_cpu(raw_super->segment_count);
fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
@@ -1089,6 +1091,22 @@ static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
if (unlikely(fsmeta >= total))
return 1;
+ main_segs = le32_to_cpu(sbi->raw_super->segment_count_main);
+ blocks_per_seg = sbi->blocks_per_seg;
+
+ for (i = 0; i < NR_CURSEG_NODE_TYPE; i++) {
+ if (le32_to_cpu(ckpt->cur_node_segno[i]) >= main_segs ||
+ le16_to_cpu(ckpt->cur_node_blkoff[i]) >= blocks_per_seg) {
+ return 1;
+ }
+ }
+ for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
+ if (le32_to_cpu(ckpt->cur_data_segno[i]) >= main_segs ||
+ le16_to_cpu(ckpt->cur_data_blkoff[i]) >= blocks_per_seg) {
+ return 1;
+ }
+ }
+
if (unlikely(f2fs_cp_error(sbi))) {
f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
return 1;
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-23 07:51:51 +0000