From: Konstantin Khlebnikov Date: Thu, 7 Aug 2014 16:52:33 +0000 (+0400) Subject: Smack: fix behavior of smack_inode_listsecurity X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=fd5c9d230d2ac8a2594dfd15f0cca678fd7a64c7;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git Smack: fix behavior of smack_inode_listsecurity Security operation ->inode_listsecurity is used for generating list of available extended attributes for syscall listxattr. Currently it's used only in nfs4 or if filesystem doesn't provide i_op->listxattr. The list is the set of NULL-terminated names, one after the other. This method must include zero byte at the and into result. Also this function must return length even if string does not fit into output buffer or it is NULL, see similar method in selinux and man listxattr. Signed-off-by: Konstantin Khlebnikov --- diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index e6ab307ce86e..b11ab23b328b 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -1122,13 +1122,12 @@ static int smack_inode_getsecurity(const struct inode *inode, static int smack_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size) { - int len = strlen(XATTR_NAME_SMACK); + int len = sizeof(XATTR_NAME_SMACK); - if (buffer != NULL && len <= buffer_size) { + if (buffer != NULL && len <= buffer_size) memcpy(buffer, XATTR_NAME_SMACK, len); - return len; - } - return -EINVAL; + + return len; } /**