f2fs crypto: allocate buffer for decrypting filename

We got dentry pages from high_mem, and its address space directly goes into the
decryption path via f2fs_fname_disk_to_usr.
But, sg_init_one assumes the address is not from high_mem, so we can get this
panic since it doesn't call kmap_high but kunmap_high is triggered at the end.

kernel BUG at ../../../../../../kernel/mm/highmem.c:290!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM
...
 (kunmap_high+0xb0/0xb8) from [<c0114534>] (__kunmap_atomic+0xa0/0xa4)
 (__kunmap_atomic+0xa0/0xa4) from [<c035f028>] (blkcipher_walk_done+0x128/0x1ec)
 (blkcipher_walk_done+0x128/0x1ec) from [<c0366c24>] (crypto_cbc_decrypt+0xc0/0x170)
 (crypto_cbc_decrypt+0xc0/0x170) from [<c0367148>] (crypto_cts_decrypt+0xc0/0x114)
 (crypto_cts_decrypt+0xc0/0x114) from [<c035ea98>] (async_decrypt+0x40/0x48)
 (async_decrypt+0x40/0x48) from [<c032ca34>] (f2fs_fname_disk_to_usr+0x124/0x304)
 (f2fs_fname_disk_to_usr+0x124/0x304) from [<c03056fc>] (f2fs_fill_dentries+0xac/0x188)
 (f2fs_fill_dentries+0xac/0x188) from [<c03059c8>] (f2fs_readdir+0x1f0/0x300)
 (f2fs_readdir+0x1f0/0x300) from [<c0218054>] (vfs_readdir+0x90/0xb4)
 (vfs_readdir+0x90/0xb4) from [<c0218418>] (SyS_getdents64+0x64/0xcc)
 (SyS_getdents64+0x64/0xcc) from [<c0105ba0>] (ret_fast_syscall+0x0/0x30)

Cc: <stable@vger.kernel.org>
Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 8f15fc1..6726c4a 100644 (file)
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -787,7 +787,6 @@ bool f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
                else
                        d_type = DT_UNKNOWN;
 
-               /* encrypted case */
                de_name.name = d->filename[bit_pos];
                de_name.len = le16_to_cpu(de->name_len);
 
@@ -795,12 +794,20 @@ bool f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
                        int save_len = fstr->len;
                        int ret;
 
+                       de_name.name = kmalloc(de_name.len, GFP_NOFS);
+                       if (!de_name.name)
+                               return false;
+
+                       memcpy(de_name.name, d->filename[bit_pos], de_name.len);
+
                        ret = f2fs_fname_disk_to_usr(d->inode, &de->hash_code,
                                                        &de_name, fstr);
-                       de_name = *fstr;
-                       fstr->len = save_len;
+                       kfree(de_name.name);
                        if (ret < 0)
                                return true;
+
+                       de_name = *fstr;
+                       fstr->len = save_len;
                }
 
                if (!dir_emit(ctx, de_name.name, de_name.len,

diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index a680bf3..dfa01c8 100644 (file)
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -947,8 +947,13 @@ static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cook
 
        /* Symlink is encrypted */
        sd = (struct f2fs_encrypted_symlink_data *)caddr;
-       cstr.name = sd->encrypted_path;
        cstr.len = le16_to_cpu(sd->len);
+       cstr.name = kmalloc(cstr.len, GFP_NOFS);
+       if (!cstr.name) {
+               res = -ENOMEM;
+               goto errout;
+       }
+       memcpy(cstr.name, sd->encrypted_path, cstr.len);
 
        /* this is broken symlink case */
        if (cstr.name[0] == 0 && cstr.len == 0) {
@@ -970,6 +975,8 @@ static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cook
        if (res < 0)
                goto errout;
 
+       kfree(cstr.name);
+
        paddr = pstr.name;
 
        /* Null-terminate the name */
@@ -979,6 +986,7 @@ static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cook
        page_cache_release(cpage);
        return *cookie = paddr;
 errout:
+       kfree(cstr.name);
        f2fs_fname_crypto_free_buffer(&pstr);
        kunmap(cpage);
        page_cache_release(cpage);