diff options
Diffstat (limited to 'meta-rcar-gen2/recipes-kernel/linux/linux-renesas/smack/0017-Smack-Make-the-syslog-control-configurable.patch')
| -rw-r--r-- | meta-rcar-gen2/recipes-kernel/linux/linux-renesas/smack/0017-Smack-Make-the-syslog-control-configurable.patch | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/smack/0017-Smack-Make-the-syslog-control-configurable.patch b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/smack/0017-Smack-Make-the-syslog-control-configurable.patch new file mode 100644 index 0000000..a1bb4bf --- /dev/null +++ b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/smack/0017-Smack-Make-the-syslog-control-configurable.patch @@ -0,0 +1,252 @@ +From c7928b67e3b2cd91da4cec3ae3bff33306efebe4 Mon Sep 17 00:00:00 2001 +From: Casey Schaufler <casey@schaufler-ca.com> +Date: Mon, 23 Dec 2013 11:07:10 -0800 +Subject: [PATCH 17/54] Smack: Make the syslog control configurable + +The syslog control requires that the calling proccess +have the floor ("_") Smack label. Tizen does not run any +processes except for kernel helpers with the floor label. +This changes allows the admin to configure a specific +label for syslog. The default value is the star ("*") +label, effectively removing the restriction. The value +can be set using smackfs/syslog for anyone who wants +a more restrictive behavior. + +Targeted for git://git.gitorious.org/smack-next/kernel.git + +Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> +--- + security/smack/smack.h | 5 ++- + security/smack/smack_lsm.c | 4 +- + security/smack/smackfs.c | 103 +++++++++++++++++++++++++++++++++++++++++---- + 3 files changed, 99 insertions(+), 13 deletions(-) + +diff --git a/security/smack/smack.h b/security/smack/smack.h +index 364cc64..d072fd3 100644 +--- a/security/smack/smack.h ++++ b/security/smack/smack.h +@@ -241,7 +241,8 @@ u32 smack_to_secid(const char *); + extern int smack_cipso_direct; + extern int smack_cipso_mapped; + extern struct smack_known *smack_net_ambient; +-extern char *smack_onlycap; ++extern struct smack_known *smack_onlycap; ++extern struct smack_known *smack_syslog_label; + extern const char *smack_cipso_option; + + extern struct smack_known smack_known_floor; +@@ -312,7 +313,7 @@ static inline int smack_privileged(int cap) + + if (!capable(cap)) + return 0; +- if (smack_onlycap == NULL || smack_onlycap == skp->smk_known) ++ if (smack_onlycap == NULL || smack_onlycap == skp) + return 1; + return 0; + } +diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c +index 62ebf4f..67b7381d 100644 +--- a/security/smack/smack_lsm.c ++++ b/security/smack/smack_lsm.c +@@ -219,8 +219,6 @@ static int smack_ptrace_traceme(struct task_struct *ptp) + * smack_syslog - Smack approval on syslog + * @type: message type + * +- * Require that the task has the floor label +- * + * Returns 0 on success, error code otherwise. + */ + static int smack_syslog(int typefrom_file) +@@ -231,7 +229,7 @@ static int smack_syslog(int typefrom_file) + if (smack_privileged(CAP_MAC_OVERRIDE)) + return 0; + +- if (skp != &smack_known_floor) ++ if (smack_syslog_label != NULL && smack_syslog_label != skp) + rc = -EACCES; + + return rc; +diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c +index 1c89ade..f5a6bb8 100644 +--- a/security/smack/smackfs.c ++++ b/security/smack/smackfs.c +@@ -52,6 +52,7 @@ enum smk_inos { + SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */ + SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */ + SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */ ++ SMK_SYSLOG = 20, /* change syslog label) */ + }; + + /* +@@ -59,6 +60,7 @@ enum smk_inos { + */ + static DEFINE_MUTEX(smack_cipso_lock); + static DEFINE_MUTEX(smack_ambient_lock); ++static DEFINE_MUTEX(smack_syslog_lock); + static DEFINE_MUTEX(smk_netlbladdr_lock); + + /* +@@ -90,7 +92,13 @@ int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT; + * everyone. It is expected that the hat (^) label + * will be used if any label is used. + */ +-char *smack_onlycap; ++struct smack_known *smack_onlycap; ++ ++/* ++ * If this value is set restrict syslog use to the label specified. ++ * It can be reset via smackfs/syslog ++ */ ++struct smack_known *smack_syslog_label; + + /* + * Certain IP addresses may be designated as single label hosts. +@@ -1603,7 +1611,7 @@ static const struct file_operations smk_ambient_ops = { + }; + + /** +- * smk_read_onlycap - read() for /smack/onlycap ++ * smk_read_onlycap - read() for smackfs/onlycap + * @filp: file pointer, not actually used + * @buf: where to put the result + * @cn: maximum to send along +@@ -1622,7 +1630,7 @@ static ssize_t smk_read_onlycap(struct file *filp, char __user *buf, + return 0; + + if (smack_onlycap != NULL) +- smack = smack_onlycap; ++ smack = smack_onlycap->smk_known; + + asize = strlen(smack) + 1; + +@@ -1633,7 +1641,7 @@ static ssize_t smk_read_onlycap(struct file *filp, char __user *buf, + } + + /** +- * smk_write_onlycap - write() for /smack/onlycap ++ * smk_write_onlycap - write() for smackfs/onlycap + * @file: file pointer, not actually used + * @buf: where to get the data from + * @count: bytes sent +@@ -1656,7 +1664,7 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, + * explicitly for clarity. The smk_access() implementation + * would use smk_access(smack_onlycap, MAY_WRITE) + */ +- if (smack_onlycap != NULL && smack_onlycap != skp->smk_known) ++ if (smack_onlycap != NULL && smack_onlycap != skp) + return -EPERM; + + data = kzalloc(count, GFP_KERNEL); +@@ -1676,7 +1684,7 @@ static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, + if (copy_from_user(data, buf, count) != 0) + rc = -EFAULT; + else +- smack_onlycap = smk_import(data, count); ++ smack_onlycap = smk_import_entry(data, count); + + kfree(data); + return rc; +@@ -2159,12 +2167,89 @@ static const struct file_operations smk_change_rule_ops = { + }; + + /** +- * smk_fill_super - fill the /smackfs superblock ++ * smk_read_syslog - read() for smackfs/syslog ++ * @filp: file pointer, not actually used ++ * @buf: where to put the result ++ * @cn: maximum to send along ++ * @ppos: where to start ++ * ++ * Returns number of bytes read or error code, as appropriate ++ */ ++static ssize_t smk_read_syslog(struct file *filp, char __user *buf, ++ size_t cn, loff_t *ppos) ++{ ++ struct smack_known *skp; ++ ssize_t rc = -EINVAL; ++ int asize; ++ ++ if (*ppos != 0) ++ return 0; ++ ++ if (smack_syslog_label == NULL) ++ skp = &smack_known_star; ++ else ++ skp = smack_syslog_label; ++ ++ asize = strlen(skp->smk_known) + 1; ++ ++ if (cn >= asize) ++ rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known, ++ asize); ++ ++ return rc; ++} ++ ++/** ++ * smk_write_syslog - write() for smackfs/syslog ++ * @file: file pointer, not actually used ++ * @buf: where to get the data from ++ * @count: bytes sent ++ * @ppos: where to start ++ * ++ * Returns number of bytes written or error code, as appropriate ++ */ ++static ssize_t smk_write_syslog(struct file *file, const char __user *buf, ++ size_t count, loff_t *ppos) ++{ ++ char *data; ++ struct smack_known *skp; ++ int rc = count; ++ ++ if (!smack_privileged(CAP_MAC_ADMIN)) ++ return -EPERM; ++ ++ data = kzalloc(count, GFP_KERNEL); ++ if (data == NULL) ++ return -ENOMEM; ++ ++ if (copy_from_user(data, buf, count) != 0) ++ rc = -EFAULT; ++ else { ++ skp = smk_import_entry(data, count); ++ if (skp == NULL) ++ rc = -EINVAL; ++ else ++ smack_syslog_label = smk_import_entry(data, count); ++ } ++ ++ kfree(data); ++ return rc; ++} ++ ++static const struct file_operations smk_syslog_ops = { ++ .read = smk_read_syslog, ++ .write = smk_write_syslog, ++ .llseek = default_llseek, ++}; ++ ++ ++/** ++ * smk_fill_super - fill the smackfs superblock + * @sb: the empty superblock + * @data: unused + * @silent: unused + * +- * Fill in the well known entries for /smack ++ * Fill in the well known entries for the smack filesystem + * + * Returns 0 on success, an error code on failure + */ +@@ -2209,6 +2294,8 @@ static int smk_fill_super(struct super_block *sb, void *data, int silent) + S_IRUGO|S_IWUSR}, + [SMK_CHANGE_RULE] = { + "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR}, ++ [SMK_SYSLOG] = { ++ "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR}, + /* last one */ + {""} + }; +-- +2.1.4 + |