From d201844dbf7b8b243884be46990133644f71dd4f Mon Sep 17 00:00:00 2001 From: Seung-Woo Kim Date: Mon, 12 Dec 2016 17:21:40 +0900 Subject: [PATCH] Smack: ignore private inode for file functions The access to fd from anon_inode is always failed because there is no set xattr operations. So this patch fixes to ignore private inode including anon_inode for file functions. It was only ignored for smack_file_receive() to share dma-buf fd, but dma-buf has other functions like ioctl and mmap. Reference: https://lkml.org/lkml/2015/4/17/16 Change-Id: I1c6b93107c17e1ca3d96360c5cb8ec18a29ba45e Signed-off-by: Seung-Woo Kim --- security/smack/smack_lsm.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 793c23a43b4f..38135fc9b802 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -1632,6 +1632,9 @@ static int smack_file_ioctl(struct file *file, unsigned int cmd, struct smk_audit_info ad; struct inode *inode = file_inode(file); + if (unlikely(IS_PRIVATE(inode))) + return 0; + smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); smk_ad_setfield_u_fs_path(&ad, file->f_path); @@ -1661,6 +1664,9 @@ static int smack_file_lock(struct file *file, unsigned int cmd) int rc; struct inode *inode = file_inode(file); + if (unlikely(IS_PRIVATE(inode))) + return 0; + smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH); smk_ad_setfield_u_fs_path(&ad, file->f_path); rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad); @@ -1687,6 +1693,9 @@ static int smack_file_fcntl(struct file *file, unsigned int cmd, int rc = 0; struct inode *inode = file_inode(file); + if (unlikely(IS_PRIVATE(inode))) + return 0; + switch (cmd) { case F_GETLK: break; @@ -1739,6 +1748,9 @@ static int smack_mmap_file(struct file *file, if (file == NULL) return 0; + if (unlikely(IS_PRIVATE(file_inode(file)))) + return 0; + isp = file_inode(file)->i_security; if (isp->smk_mmap == NULL) return 0; -- 2.34.1