提交 a810087a 编写于 作者: E Eric Biggers 提交者: Zheng Zengkai

ext4: report correct st_size for encrypted symlinks

stable inclusion
from stable-5.10.63
commit 894a02236d0d20305556af4bfba3259f28c0b86b
bugzilla: 182231 https://gitee.com/openeuler/kernel/issues/I4EFS1

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=894a02236d0d20305556af4bfba3259f28c0b86b

--------------------------------

commit 8c4bca10 upstream.

The stat() family of syscalls report the wrong size for encrypted
symlinks, which has caused breakage in several userspace programs.

Fix this by calling fscrypt_symlink_getattr() after ext4_getattr() for
encrypted symlinks.  This function computes the correct size by reading
and decrypting the symlink target (if it's not already cached).

For more details, see the commit which added fscrypt_symlink_getattr().

Fixes: f348c252 ("ext4 crypto: add symlink encryption")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210702065350.209646-3-ebiggers@kernel.orgSigned-off-by: NEric Biggers <ebiggers@google.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
上级 337717e5
......@@ -52,10 +52,19 @@ static const char *ext4_encrypted_get_link(struct dentry *dentry,
return paddr;
}
static int ext4_encrypted_symlink_getattr(const struct path *path,
struct kstat *stat, u32 request_mask,
unsigned int query_flags)
{
ext4_getattr(path, stat, request_mask, query_flags);
return fscrypt_symlink_getattr(path, stat);
}
const struct inode_operations ext4_encrypted_symlink_inode_operations = {
.get_link = ext4_encrypted_get_link,
.setattr = ext4_setattr,
.getattr = ext4_getattr,
.getattr = ext4_encrypted_symlink_getattr,
.listxattr = ext4_listxattr,
};
......
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