@@ -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,
@@ -940,8 +940,13 @@ 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) {
@@ -963,6 +968,8 @@ 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 */
@@ -972,6 +979,7 @@ 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);
This is a note to let you know that I have just added a patch titled f2fs crypto: allocate buffer for decrypting filename to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree which can be found at: http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue This patch is scheduled to be released in version 4.2.8-ckt1. If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 4.2.y-ckt tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Kamal ------ From d0342759a2b8810f7aa358d23a96612aedf30b1f Mon Sep 17 00:00:00 2001 From: Jaegeuk Kim <jaegeuk@kernel.org> Date: Thu, 3 Sep 2015 13:38:23 -0700 Subject: f2fs crypto: allocate buffer for decrypting filename commit 569cf1876a32e574ba8a7fb825cd91bafd003882 upstream. 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) Reviewed-by: Chao Yu <chao2.yu@samsung.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- fs/f2fs/dir.c | 13 ++++++++++--- fs/f2fs/namei.c | 10 +++++++++- 2 files changed, 19 insertions(+), 4 deletions(-) -- 1.9.1