diff options
Diffstat (limited to 'meta-agl-bsp/meta-qcom/recipes-kernel/linux/files/0001-Smack-File-receive-for-sockets.patch')
| -rw-r--r-- | meta-agl-bsp/meta-qcom/recipes-kernel/linux/files/0001-Smack-File-receive-for-sockets.patch | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/meta-agl-bsp/meta-qcom/recipes-kernel/linux/files/0001-Smack-File-receive-for-sockets.patch b/meta-agl-bsp/meta-qcom/recipes-kernel/linux/files/0001-Smack-File-receive-for-sockets.patch new file mode 100644 index 000000000..4021e5d38 --- /dev/null +++ b/meta-agl-bsp/meta-qcom/recipes-kernel/linux/files/0001-Smack-File-receive-for-sockets.patch @@ -0,0 +1,65 @@ +From 2b206c36b16e72cfe41cd22448d8527359ffd962 Mon Sep 17 00:00:00 2001 +From: Casey Schaufler <casey@schaufler-ca.com> +Date: Mon, 7 Dec 2015 14:34:32 -0800 +Subject: [PATCH 1/4] Smack: File receive for sockets + +The existing file receive hook checks for access on +the file inode even for UDS. This is not right, as +the inode is not used by Smack to make access checks +for sockets. This change checks for an appropriate +access relationship between the receiving (current) +process and the socket. If the process can't write +to the socket's send label or the socket's receive +label can't write to the process fail. + +This will allow the legitimate cases, where the +socket sender and socket receiver can freely communicate. +Only strangly set socket labels should cause a problem. + +Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> +--- + security/smack/smack_lsm.c | 22 ++++++++++++++++++++++ + 1 file changed, 22 insertions(+) + +diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c +index ff81026..b20ef06 100644 +--- a/security/smack/smack_lsm.c ++++ b/security/smack/smack_lsm.c +@@ -1860,12 +1860,34 @@ static int smack_file_receive(struct file *file) + int may = 0; + struct smk_audit_info ad; + struct inode *inode = file_inode(file); ++ struct socket *sock; ++ struct task_smack *tsp; ++ struct socket_smack *ssp; + + 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); ++ ++ if (S_ISSOCK(inode->i_mode)) { ++ sock = SOCKET_I(inode); ++ ssp = sock->sk->sk_security; ++ tsp = current_security(); ++ /* ++ * If the receiving process can't write to the ++ * passed socket or if the passed socket can't ++ * write to the receiving process don't accept ++ * the passed socket. ++ */ ++ rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad); ++ rc = smk_bu_file(file, may, rc); ++ if (rc < 0) ++ return rc; ++ rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad); ++ rc = smk_bu_file(file, may, rc); ++ return rc; ++ } + /* + * This code relies on bitmasks. + */ +-- +2.7.4 + |