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Merge git://git.infradead.org/users/eparis/audit

Browse source 
Pull audit updates from Eric Paris.

* git://git.infradead.org/users/eparis/audit: (28 commits)
  AUDIT: make audit_is_compat depend on CONFIG_AUDIT_COMPAT_GENERIC
  audit: renumber AUDIT_FEATURE_CHANGE into the 1300 range
  audit: do not cast audit_rule_data pointers pointlesly
  AUDIT: Allow login in non-init namespaces
  audit: define audit_is_compat in kernel internal header
  kernel: Use RCU_INIT_POINTER(x, NULL) in audit.c
  sched: declare pid_alive as inline
  audit: use uapi/linux/audit.h for AUDIT_ARCH declarations
  syscall_get_arch: remove useless function arguments
  audit: remove stray newline from audit_log_execve_info() audit_panic() call
  audit: remove stray newlines from audit_log_lost messages
  audit: include subject in login records
  audit: remove superfluous new- prefix in AUDIT_LOGIN messages
  audit: allow user processes to log from another PID namespace
  audit: anchor all pid references in the initial pid namespace
  audit: convert PPIDs to the inital PID namespace.
  pid: get pid_t ppid of task in init_pid_ns
  audit: rename the misleading audit_get_context() to audit_take_context()
  audit: Add generic compat syscall support
  audit: Add CONFIG_HAVE_ARCH_AUDITSYSCALL
  ...
This commit is contained in:
Linus Torvalds 2014-04-12 12:38:53 -07:00
commit 0b747172dc
36 changed files with 351 additions and 119 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
arch/alpha/Kconfig
View file

@ -22,6 +22,7 @@ config ALPHA
select GENERIC_SMP_IDLE_THREAD
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select HAVE_ARCH_AUDITSYSCALL
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
select ODD_RT_SIGACTION

1
arch/arm/Kconfig
View file

@ -24,6 +24,7 @@ config ARM
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select HARDIRQS_SW_RESEND
select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL
select HAVE_ARCH_KGDB
select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)

5
arch/arm/include/asm/syscall.h
View file

@ -7,7 +7,7 @@
#ifndef _ASM_ARM_SYSCALL_H
#define _ASM_ARM_SYSCALL_H
#include <linux/audit.h> /* for AUDIT_ARCH_* */
#include <uapi/linux/audit.h> /* for AUDIT_ARCH_* */
#include <linux/elf.h> /* for ELF_EM */
#include <linux/err.h>
#include <linux/sched.h>
@ -103,8 +103,7 @@ static inline void syscall_set_arguments(struct task_struct *task,
memcpy(&regs->ARM_r0 + i, args, n * sizeof(args[0]));
}
static inline int syscall_get_arch(struct task_struct *task,
struct pt_regs *regs)
static inline int syscall_get_arch(void)
{
/* ARM tasks don't change audit architectures on the fly. */
return AUDIT_ARCH_ARM;

1
arch/ia64/Kconfig
View file

@ -45,6 +45,7 @@ config IA64
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
select ARCH_USE_CMPXCHG_LOCKREF
select HAVE_ARCH_AUDITSYSCALL
default y
help
The Itanium Processor Family is Intel's 64-bit successor to

7
arch/mips/include/asm/syscall.h
View file

@ -14,7 +14,7 @@
#define __ASM_MIPS_SYSCALL_H
#include <linux/compiler.h>
#include <linux/audit.h>
#include <uapi/linux/audit.h>
#include <linux/elf-em.h>
#include <linux/kernel.h>
#include <linux/sched.h>
@ -127,12 +127,11 @@ extern const unsigned long sys_call_table[];
extern const unsigned long sys32_call_table[];
extern const unsigned long sysn32_call_table[];
static inline int syscall_get_arch(struct task_struct *task,
struct pt_regs *regs)
static inline int syscall_get_arch(void)
{
int arch = EM_MIPS;
#ifdef CONFIG_64BIT
if (!test_tsk_thread_flag(task, TIF_32BIT_REGS))
if (!test_thread_flag(TIF_32BIT_REGS))
arch |= __AUDIT_ARCH_64BIT;
#endif
#if defined(__LITTLE_ENDIAN)

2
arch/mips/kernel/ptrace.c
View file

@ -649,7 +649,7 @@ asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall)
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
trace_sys_enter(regs, regs->regs[2]);
audit_syscall_entry(syscall_get_arch(current, regs),
audit_syscall_entry(syscall_get_arch(),
syscall,
regs->regs[4], regs->regs[5],
regs->regs[6], regs->regs[7]);

1
arch/parisc/Kconfig
View file

@ -28,6 +28,7 @@ config PARISC
select CLONE_BACKWARDS
select TTY # Needed for pdc_cons.c
select HAVE_DEBUG_STACKOVERFLOW
select HAVE_ARCH_AUDITSYSCALL
help
The PA-RISC microprocessor is designed by Hewlett-Packard and used

1
arch/powerpc/Kconfig
View file

@ -144,6 +144,7 @@ config PPC
select HAVE_DEBUG_STACKOVERFLOW
select HAVE_IRQ_EXIT_ON_IRQ_STACK
select ARCH_USE_CMPXCHG_LOCKREF if PPC64
select HAVE_ARCH_AUDITSYSCALL
config GENERIC_CSUM
def_bool CPU_LITTLE_ENDIAN

1
arch/s390/Kconfig
View file

@ -103,6 +103,7 @@ config S390
select GENERIC_SMP_IDLE_THREAD
select GENERIC_TIME_VSYSCALL
select HAVE_ALIGNED_STRUCT_PAGE if SLUB
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ARCH_TRACEHOOK

7
arch/s390/include/asm/syscall.h
View file

@ -12,7 +12,7 @@
#ifndef _ASM_SYSCALL_H
#define _ASM_SYSCALL_H 1
#include <linux/audit.h>
#include <uapi/linux/audit.h>
#include <linux/sched.h>
#include <linux/err.h>
#include <asm/ptrace.h>
@ -89,11 +89,10 @@ static inline void syscall_set_arguments(struct task_struct *task,
regs->orig_gpr2 = args[0];
}
static inline int syscall_get_arch(struct task_struct *task,
struct pt_regs *regs)
static inline int syscall_get_arch(void)
{
#ifdef CONFIG_COMPAT
if (test_tsk_thread_flag(task, TIF_31BIT))
if (test_tsk_thread_flag(current, TIF_31BIT))
return AUDIT_ARCH_S390;
#endif
return sizeof(long) == 8 ? AUDIT_ARCH_S390X : AUDIT_ARCH_S390;

1
arch/sh/Kconfig
View file

@ -42,6 +42,7 @@ config SUPERH
select MODULES_USE_ELF_RELA
select OLD_SIGSUSPEND
select OLD_SIGACTION
select HAVE_ARCH_AUDITSYSCALL
help
The SuperH is a RISC processor targeted for use in embedded systems
and consumer electronics; it was also used in the Sega Dreamcast

1
arch/sparc/Kconfig
View file

@ -77,6 +77,7 @@ config SPARC64
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select HAVE_C_RECORDMCOUNT
select NO_BOOTMEM
select HAVE_ARCH_AUDITSYSCALL
config ARCH_DEFCONFIG
string

1
arch/um/Kconfig.common
View file

@ -1,6 +1,7 @@
config UML
bool
default y
select HAVE_ARCH_AUDITSYSCALL
select HAVE_UID16
select GENERIC_IRQ_SHOW
select GENERIC_CPU_DEVICES

1
arch/x86/Kconfig
View file

@ -129,6 +129,7 @@ config X86
select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64
select HAVE_CC_STACKPROTECTOR
select GENERIC_CPU_AUTOPROBE
select HAVE_ARCH_AUDITSYSCALL
config INSTRUCTION_DECODER
def_bool y

10
arch/x86/include/asm/syscall.h
View file

@ -13,7 +13,7 @@
#ifndef _ASM_X86_SYSCALL_H
#define _ASM_X86_SYSCALL_H
#include <linux/audit.h>
#include <uapi/linux/audit.h>
#include <linux/sched.h>
#include <linux/err.h>
#include <asm/asm-offsets.h> /* For NR_syscalls */
@ -91,8 +91,7 @@ static inline void syscall_set_arguments(struct task_struct *task,
memcpy(&regs->bx + i, args, n * sizeof(args[0]));
}
static inline int syscall_get_arch(struct task_struct *task,
struct pt_regs *regs)
static inline int syscall_get_arch(void)
{
return AUDIT_ARCH_I386;
}
@ -221,8 +220,7 @@ static inline void syscall_set_arguments(struct task_struct *task,
}
}
static inline int syscall_get_arch(struct task_struct *task,
struct pt_regs *regs)
static inline int syscall_get_arch(void)
{
#ifdef CONFIG_IA32_EMULATION
/*
@ -234,7 +232,7 @@ static inline int syscall_get_arch(struct task_struct *task,
*
* x32 tasks should be considered AUDIT_ARCH_X86_64.
*/
if (task_thread_info(task)->status & TS_COMPAT)
if (task_thread_info(current)->status & TS_COMPAT)
return AUDIT_ARCH_I386;
#endif
/* Both x32 and x86_64 are considered "64-bit". */

3
drivers/tty/tty_audit.c
View file

@ -65,6 +65,7 @@ static void tty_audit_log(const char *description, int major, int minor,
{
struct audit_buffer *ab;
struct task_struct *tsk = current;
pid_t pid = task_pid_nr(tsk);
uid_t uid = from_kuid(&init_user_ns, task_uid(tsk));
uid_t loginuid = from_kuid(&init_user_ns, audit_get_loginuid(tsk));
unsigned int sessionid = audit_get_sessionid(tsk);
@ -74,7 +75,7 @@ static void tty_audit_log(const char *description, int major, int minor,
char name[sizeof(tsk->comm)];
audit_log_format(ab, "%s pid=%u uid=%u auid=%u ses=%u major=%d"
" minor=%d comm=", description, tsk->pid, uid,
" minor=%d comm=", description, pid, uid,
loginuid, sessionid, major, minor);
get_task_comm(name, tsk);
audit_log_untrustedstring(ab, name);

36
fs/proc/base.c
View file

@ -200,41 +200,9 @@ static int proc_root_link(struct dentry *dentry, struct path *path)
return result;
}
static int proc_pid_cmdline(struct task_struct *task, char * buffer)
static int proc_pid_cmdline(struct task_struct *task, char *buffer)
{
int res = 0;
unsigned int len;
struct mm_struct *mm = get_task_mm(task);
if (!mm)
goto out;
if (!mm->arg_end)
goto out_mm; /* Shh! No looking before we're done */
len = mm->arg_end - mm->arg_start;
if (len > PAGE_SIZE)
len = PAGE_SIZE;
res = access_process_vm(task, mm->arg_start, buffer, len, 0);
// If the nul at the end of args has been overwritten, then
// assume application is using setproctitle(3).
if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
len = strnlen(buffer, res);
if (len < res) {
res = len;
} else {
len = mm->env_end - mm->env_start;
if (len > PAGE_SIZE - res)
len = PAGE_SIZE - res;
res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
res = strnlen(buffer, res);
}
}
out_mm:
mmput(mm);
out:
return res;
return get_cmdline(task, buffer, PAGE_SIZE);
}
static int proc_pid_auxv(struct task_struct *task, char *buffer)

4
include/asm-generic/syscall.h
View file

@ -144,8 +144,6 @@ void syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
/**
* syscall_get_arch - return the AUDIT_ARCH for the current system call
* @task: task of interest, must be in system call entry tracing
* @regs: task_pt_regs() of @task
*
* Returns the AUDIT_ARCH_* based on the system call convention in use.
*
@ -155,5 +153,5 @@ void syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
* Architectures which permit CONFIG_HAVE_ARCH_SECCOMP_FILTER must
* provide an implementation of this.
*/
int syscall_get_arch(struct task_struct *task, struct pt_regs *regs);
int syscall_get_arch(void);
#endif /* _ASM_SYSCALL_H */

14
include/linux/audit.h
View file

@ -79,6 +79,14 @@ extern int is_audit_feature_set(int which);
extern int __init audit_register_class(int class, unsigned *list);
extern int audit_classify_syscall(int abi, unsigned syscall);
extern int audit_classify_arch(int arch);
/* only for compat system calls */
extern unsigned compat_write_class[];
extern unsigned compat_read_class[];
extern unsigned compat_dir_class[];
extern unsigned compat_chattr_class[];
extern unsigned compat_signal_class[];
extern int __weak audit_classify_compat_syscall(int abi, unsigned syscall);
/* audit_names->type values */
#define AUDIT_TYPE_UNKNOWN 0 /* we don't know yet */
@ -94,6 +102,12 @@ struct filename;
extern void audit_log_session_info(struct audit_buffer *ab);
#ifdef CONFIG_AUDIT_COMPAT_GENERIC
#define audit_is_compat(arch) (!((arch) & __AUDIT_ARCH_64BIT))
#else
#define audit_is_compat(arch) false
#endif
#ifdef CONFIG_AUDITSYSCALL
/* These are defined in auditsc.c */
/* Public API */

1
include/linux/mm.h
View file

@ -1204,6 +1204,7 @@ void account_page_writeback(struct page *page);
int set_page_dirty(struct page *page);
int set_page_dirty_lock(struct page *page);
int clear_page_dirty_for_io(struct page *page);
int get_cmdline(struct task_struct *task, char *buffer, int buflen);
/* Is the vma a continuation of the stack vma above it? */
static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr)

20
include/linux/sched.h
View file

@ -1719,6 +1719,24 @@ static inline pid_t task_tgid_vnr(struct task_struct *tsk)
}
static inline int pid_alive(const struct task_struct *p);
static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns)
{
pid_t pid = 0;
rcu_read_lock();
if (pid_alive(tsk))
pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns);
rcu_read_unlock();
return pid;
}
static inline pid_t task_ppid_nr(const struct task_struct *tsk)
{
return task_ppid_nr_ns(tsk, &init_pid_ns);
}
static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
struct pid_namespace *ns)
{
@ -1758,7 +1776,7 @@ static inline pid_t task_pgrp_nr(struct task_struct *tsk)
*
* Return: 1 if the process is alive. 0 otherwise.
*/
static inline int pid_alive(struct task_struct *p)
static inline int pid_alive(const struct task_struct *p)
{
return p->pids[PIDTYPE_PID].pid != NULL;
}

3
include/uapi/linux/audit.h
View file

@ -70,7 +70,6 @@
#define AUDIT_TTY_SET 1017 /* Set TTY auditing status */
#define AUDIT_SET_FEATURE 1018 /* Turn an audit feature on or off */
#define AUDIT_GET_FEATURE 1019 /* Get which features are enabled */
#define AUDIT_FEATURE_CHANGE 1020 /* audit log listing feature changes */
#define AUDIT_FIRST_USER_MSG 1100 /* Userspace messages mostly uninteresting to kernel */
#define AUDIT_USER_AVC 1107 /* We filter this differently */
@ -109,6 +108,8 @@
#define AUDIT_NETFILTER_PKT 1324 /* Packets traversing netfilter chains */
#define AUDIT_NETFILTER_CFG 1325 /* Netfilter chain modifications */
#define AUDIT_SECCOMP 1326 /* Secure Computing event */
#define AUDIT_PROCTITLE 1327 /* Proctitle emit event */
#define AUDIT_FEATURE_CHANGE 1328 /* audit log listing feature changes */
#define AUDIT_AVC 1400 /* SE Linux avc denial or grant */
#define AUDIT_SELINUX_ERR 1401 /* Internal SE Linux Errors */

4
include/uapi/linux/capability.h
View file

@ -308,8 +308,12 @@ struct vfs_cap_data {
#define CAP_LEASE 28
/* Allow writing the audit log via unicast netlink socket */
#define CAP_AUDIT_WRITE 29
/* Allow configuration of audit via unicast netlink socket */
#define CAP_AUDIT_CONTROL 30
#define CAP_SETFCAP 31

5
init/Kconfig
View file

@ -292,9 +292,12 @@ config AUDIT
logging of avc messages output). Does not do system-call
auditing without CONFIG_AUDITSYSCALL.
config HAVE_ARCH_AUDITSYSCALL
bool
config AUDITSYSCALL
bool "Enable system-call auditing support"
depends on AUDIT && (X86 || PARISC || PPC || S390 || IA64 || UML || SPARC64 || SUPERH || (ARM && AEABI && !OABI_COMPAT) || ALPHA)
depends on AUDIT && HAVE_ARCH_AUDITSYSCALL
default y if SECURITY_SELINUX
help
Enable low-overhead system-call auditing infrastructure that

27
kernel/audit.c
View file

@ -182,7 +182,7 @@ struct audit_buffer {
struct audit_reply {
__u32 portid;
struct net *net;
struct net *net;
struct sk_buff *skb;
};
@ -396,7 +396,7 @@ static void audit_printk_skb(struct sk_buff *skb)
if (printk_ratelimit())
pr_notice("type=%d %s\n", nlh->nlmsg_type, data);
else
audit_log_lost("printk limit exceeded\n");
audit_log_lost("printk limit exceeded");
}
audit_hold_skb(skb);
@ -412,7 +412,7 @@ static void kauditd_send_skb(struct sk_buff *skb)
BUG_ON(err != -ECONNREFUSED); /* Shouldn't happen */
if (audit_pid) {
pr_err("*NO* daemon at audit_pid=%d\n", audit_pid);
audit_log_lost("auditd disappeared\n");
audit_log_lost("auditd disappeared");
audit_pid = 0;
audit_sock = NULL;
}
@ -607,7 +607,7 @@ static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
{
int err = 0;
/* Only support the initial namespaces for now. */
/* Only support initial user namespace for now. */
/*
* We return ECONNREFUSED because it tricks userspace into thinking
* that audit was not configured into the kernel. Lots of users
@ -618,8 +618,7 @@ static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
* userspace will reject all logins. This should be removed when we
* support non init namespaces!!
*/
if ((current_user_ns() != &init_user_ns) ||
(task_active_pid_ns(current) != &init_pid_ns))
if (current_user_ns() != &init_user_ns)
return -ECONNREFUSED;
switch (msg_type) {
@ -639,6 +638,11 @@ static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
case AUDIT_TTY_SET:
case AUDIT_TRIM:
case AUDIT_MAKE_EQUIV:
/* Only support auditd and auditctl in initial pid namespace
* for now. */
if ((task_active_pid_ns(current) != &init_pid_ns))
return -EPERM;
if (!capable(CAP_AUDIT_CONTROL))
err = -EPERM;
break;
@ -659,6 +663,7 @@ static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type)
{
int rc = 0;
uid_t uid = from_kuid(&init_user_ns, current_uid());
pid_t pid = task_tgid_nr(current);
if (!audit_enabled && msg_type != AUDIT_USER_AVC) {
*ab = NULL;
@ -668,7 +673,7 @@ static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type)
*ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
if (unlikely(!*ab))
return rc;
audit_log_format(*ab, "pid=%d uid=%u", task_tgid_vnr(current), uid);
audit_log_format(*ab, "pid=%d uid=%u", pid, uid);
audit_log_session_info(*ab);
audit_log_task_context(*ab);
@ -1097,7 +1102,7 @@ static void __net_exit audit_net_exit(struct net *net)
audit_sock = NULL;
}
rcu_assign_pointer(aunet->nlsk, NULL);
RCU_INIT_POINTER(aunet->nlsk, NULL);
synchronize_net();
netlink_kernel_release(sock);
}
@ -1829,11 +1834,11 @@ void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
spin_unlock_irq(&tsk->sighand->siglock);
audit_log_format(ab,
" ppid=%ld pid=%d auid=%u uid=%u gid=%u"
" ppid=%d pid=%d auid=%u uid=%u gid=%u"
" euid=%u suid=%u fsuid=%u"
" egid=%u sgid=%u fsgid=%u tty=%s ses=%u",
sys_getppid(),
tsk->pid,
task_ppid_nr(tsk),
task_pid_nr(tsk),
from_kuid(&init_user_ns, audit_get_loginuid(tsk)),
from_kuid(&init_user_ns, cred->uid),
from_kgid(&init_user_ns, cred->gid),

6
kernel/audit.h
View file

@ -106,6 +106,11 @@ struct audit_names {
bool should_free;
};
struct audit_proctitle {
int len; /* length of the cmdline field. */
char *value; /* the cmdline field */
};
/* The per-task audit context. */
struct audit_context {
int dummy; /* must be the first element */
@ -202,6 +207,7 @@ struct audit_context {
} execve;
};
int fds[2];
struct audit_proctitle proctitle;
#if AUDIT_DEBUG
int put_count;

33
kernel/auditfilter.c
View file

@ -19,6 +19,8 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/audit.h>
#include <linux/kthread.h>
@ -226,7 +228,7 @@ static int audit_match_signal(struct audit_entry *entry)
#endif
/* Common user-space to kernel rule translation. */
static inline struct audit_entry *audit_to_entry_common(struct audit_rule *rule)
static inline struct audit_entry *audit_to_entry_common(struct audit_rule_data *rule)
{
unsigned listnr;
struct audit_entry *entry;
@ -249,7 +251,7 @@ static inline struct audit_entry *audit_to_entry_common(struct audit_rule *rule)
;
}
if (unlikely(rule->action == AUDIT_POSSIBLE)) {
printk(KERN_ERR "AUDIT_POSSIBLE is deprecated\n");
pr_err("AUDIT_POSSIBLE is deprecated\n");
goto exit_err;
}
if (rule->action != AUDIT_NEVER && rule->action != AUDIT_ALWAYS)
@ -403,7 +405,7 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
int i;
char *str;
entry = audit_to_entry_common((struct audit_rule *)data);
entry = audit_to_entry_common(data);
if (IS_ERR(entry))
goto exit_nofree;
@ -431,6 +433,19 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
f->val = 0;
}
if ((f->type == AUDIT_PID) || (f->type == AUDIT_PPID)) {
struct pid *pid;
rcu_read_lock();
pid = find_vpid(f->val);
if (!pid) {
rcu_read_unlock();
err = -ESRCH;
goto exit_free;
}
f->val = pid_nr(pid);
rcu_read_unlock();
}
err = audit_field_valid(entry, f);
if (err)
goto exit_free;
@ -479,8 +494,8 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data,
/* Keep currently invalid fields around in case they
* become valid after a policy reload. */
if (err == -EINVAL) {
printk(KERN_WARNING "audit rule for LSM "
"\'%s\' is invalid\n", str);
pr_warn("audit rule for LSM \'%s\' is invalid\n",
str);
err = 0;
}
if (err) {
@ -709,8 +724,8 @@ static inline int audit_dupe_lsm_field(struct audit_field *df,
/* Keep currently invalid fields around in case they
* become valid after a policy reload. */
if (ret == -EINVAL) {
printk(KERN_WARNING "audit rule for LSM \'%s\' is "
"invalid\n", df->lsm_str);
pr_warn("audit rule for LSM \'%s\' is invalid\n",
df->lsm_str);
ret = 0;
}
@ -1240,12 +1255,14 @@ static int audit_filter_user_rules(struct audit_krule *rule, int type,
for (i = 0; i < rule->field_count; i++) {
struct audit_field *f = &rule->fields[i];
pid_t pid;
int result = 0;
u32 sid;
switch (f->type) {
case AUDIT_PID:
result = audit_comparator(task_pid_vnr(current), f->op, f->val);
pid = task_pid_nr(current);
result = audit_comparator(pid, f->op, f->val);
break;
case AUDIT_UID:
result = audit_uid_comparator(current_uid(), f->op, f->uid);

133
kernel/auditsc.c
View file

@ -42,6 +42,8 @@
* and <dustin.kirkland@us.ibm.com> for LSPP certification compliance.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/init.h>
#include <asm/types.h>
#include <linux/atomic.h>
@ -68,6 +70,7 @@
#include <linux/capability.h>
#include <linux/fs_struct.h>
#include <linux/compat.h>
#include <linux/ctype.h>
#include "audit.h"
@ -79,6 +82,9 @@
/* no execve audit message should be longer than this (userspace limits) */
#define MAX_EXECVE_AUDIT_LEN 7500
/* max length to print of cmdline/proctitle value during audit */
#define MAX_PROCTITLE_AUDIT_LEN 128
/* number of audit rules */
int audit_n_rules;
@ -451,15 +457,17 @@ static int audit_filter_rules(struct task_struct *tsk,
struct audit_field *f = &rule->fields[i];
struct audit_names *n;
int result = 0;
pid_t pid;
switch (f->type) {
case AUDIT_PID:
result = audit_comparator(tsk->pid, f->op, f->val);
pid = task_pid_nr(tsk);
result = audit_comparator(pid, f->op, f->val);
break;
case AUDIT_PPID:
if (ctx) {
if (!ctx->ppid)
ctx->ppid = sys_getppid();
ctx->ppid = task_ppid_nr(tsk);
result = audit_comparator(ctx->ppid, f->op, f->val);
}
break;
@ -805,7 +813,8 @@ void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx)
rcu_read_unlock();
}
static inline struct audit_context *audit_get_context(struct task_struct *tsk,
/* Transfer the audit context pointer to the caller, clearing it in the tsk's struct */
static inline struct audit_context *audit_take_context(struct task_struct *tsk,
int return_valid,
long return_code)
{
@ -842,6 +851,13 @@ static inline struct audit_context *audit_get_context(struct task_struct *tsk,
return context;
}
static inline void audit_proctitle_free(struct audit_context *context)
{
kfree(context->proctitle.value);
context->proctitle.value = NULL;
context->proctitle.len = 0;
}
static inline void audit_free_names(struct audit_context *context)
{
struct audit_names *n, *next;
@ -850,16 +866,15 @@ static inline void audit_free_names(struct audit_context *context)
if (context->put_count + context->ino_count != context->name_count) {
int i = 0;
printk(KERN_ERR "%s:%d(:%d): major=%d in_syscall=%d"
" name_count=%d put_count=%d"
" ino_count=%d [NOT freeing]\n",
__FILE__, __LINE__,
pr_err("%s:%d(:%d): major=%d in_syscall=%d"
" name_count=%d put_count=%d ino_count=%d"
" [NOT freeing]\n", __FILE__, __LINE__,
context->serial, context->major, context->in_syscall,
context->name_count, context->put_count,
context->ino_count);
list_for_each_entry(n, &context->names_list, list) {
printk(KERN_ERR "names[%d] = %p = %s\n", i++,
n->name, n->name->name ?: "(null)");
pr_err("names[%d] = %p = %s\n", i++, n->name,
n->name->name ?: "(null)");
}
dump_stack();
return;
@ -955,6 +970,7 @@ static inline void audit_free_context(struct audit_context *context)
audit_free_aux(context);
kfree(context->filterkey);
kfree(context->sockaddr);
audit_proctitle_free(context);
kfree(context);
}
@ -1157,7 +1173,7 @@ static void audit_log_execve_info(struct audit_context *context,
*/
buf = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL);
if (!buf) {
audit_panic("out of memory for argv string\n");
audit_panic("out of memory for argv string");
return;
}
@ -1271,6 +1287,59 @@ static void show_special(struct audit_context *context, int *call_panic)
audit_log_end(ab);
}
static inline int audit_proctitle_rtrim(char *proctitle, int len)
{
char *end = proctitle + len - 1;
while (end > proctitle && !isprint(*end))
end--;
/* catch the case where proctitle is only 1 non-print character */
len = end - proctitle + 1;
len -= isprint(proctitle[len-1]) == 0;
return len;
}
static void audit_log_proctitle(struct task_struct *tsk,
struct audit_context *context)
{
int res;
char *buf;
char *msg = "(null)";
int len = strlen(msg);
struct audit_buffer *ab;
ab = audit_log_start(context, GFP_KERNEL, AUDIT_PROCTITLE);
if (!ab)
return; /* audit_panic or being filtered */
audit_log_format(ab, "proctitle=");
/* Not cached */
if (!context->proctitle.value) {
buf = kmalloc(MAX_PROCTITLE_AUDIT_LEN, GFP_KERNEL);
if (!buf)
goto out;
/* Historically called this from procfs naming */
res = get_cmdline(tsk, buf, MAX_PROCTITLE_AUDIT_LEN);
if (res == 0) {
kfree(buf);
goto out;
}
res = audit_proctitle_rtrim(buf, res);
if (res == 0) {
kfree(buf);
goto out;
}
context->proctitle.value = buf;
context->proctitle.len = res;
}
msg = context->proctitle.value;
len = context->proctitle.len;
out:
audit_log_n_untrustedstring(ab, msg, len);
audit_log_end(ab);
}
static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
{
int i, call_panic = 0;
@ -1388,6 +1457,8 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
audit_log_name(context, n, NULL, i++, &call_panic);
}
audit_log_proctitle(tsk, context);
/* Send end of event record to help user space know we are finished */
ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
if (ab)
@ -1406,7 +1477,7 @@ void __audit_free(struct task_struct *tsk)
{
struct audit_context *context;
context = audit_get_context(tsk, 0, 0);
context = audit_take_context(tsk, 0, 0);
if (!context)
return;
@ -1500,7 +1571,7 @@ void __audit_syscall_exit(int success, long return_code)
else
success = AUDITSC_FAILURE;
context = audit_get_context(tsk, success, return_code);
context = audit_take_context(tsk, success, return_code);
if (!context)
return;
@ -1550,7 +1621,7 @@ static inline void handle_one(const struct inode *inode)
if (likely(put_tree_ref(context, chunk)))
return;
if (unlikely(!grow_tree_refs(context))) {
printk(KERN_WARNING "out of memory, audit has lost a tree reference\n");
pr_warn("out of memory, audit has lost a tree reference\n");
audit_set_auditable(context);
audit_put_chunk(chunk);
unroll_tree_refs(context, p, count);
@ -1609,8 +1680,7 @@ static void handle_path(const struct dentry *dentry)
goto retry;
}
/* too bad */
printk(KERN_WARNING
"out of memory, audit has lost a tree reference\n");
pr_warn("out of memory, audit has lost a tree reference\n");
unroll_tree_refs(context, p, count);
audit_set_auditable(context);
return;
@ -1682,7 +1752,7 @@ void __audit_getname(struct filename *name)
if (!context->in_syscall) {
#if AUDIT_DEBUG == 2
printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n",
pr_err("%s:%d(:%d): ignoring getname(%p)\n",
__FILE__, __LINE__, context->serial, name);
dump_stack();
#endif
@ -1721,15 +1791,15 @@ void audit_putname(struct filename *name)
BUG_ON(!context);
if (!name->aname || !context->in_syscall) {
#if AUDIT_DEBUG == 2
printk(KERN_ERR "%s:%d(:%d): final_putname(%p)\n",
pr_err("%s:%d(:%d): final_putname(%p)\n",
__FILE__, __LINE__, context->serial, name);
if (context->name_count) {
struct audit_names *n;
int i = 0;
list_for_each_entry(n, &context->names_list, list)
printk(KERN_ERR "name[%d] = %p = %s\n", i++,
n->name, n->name->name ?: "(null)");
pr_err("name[%d] = %p = %s\n", i++, n->name,
n->name->name ?: "(null)");
}
#endif
final_putname(name);
@ -1738,9 +1808,8 @@ void audit_putname(struct filename *name)
else {
++context->put_count;
if (context->put_count > context->name_count) {
printk(KERN_ERR "%s:%d(:%d): major=%d"
" in_syscall=%d putname(%p) name_count=%d"
" put_count=%d\n",
pr_err("%s:%d(:%d): major=%d in_syscall=%d putname(%p)"
" name_count=%d put_count=%d\n",
__FILE__, __LINE__,
context->serial, context->major,
context->in_syscall, name->name,
@ -1981,12 +2050,10 @@ static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid,
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_LOGIN);
if (!ab)
return;
audit_log_format(ab, "pid=%d uid=%u"
" old-auid=%u new-auid=%u old-ses=%u new-ses=%u"
" res=%d",
current->pid, uid,
oldloginuid, loginuid, oldsessionid, sessionid,
!rc);
audit_log_format(ab, "pid=%d uid=%u", task_pid_nr(current), uid);
audit_log_task_context(ab);
audit_log_format(ab, " old-auid=%u auid=%u old-ses=%u ses=%u res=%d",
oldloginuid, loginuid, oldsessionid, sessionid, !rc);
audit_log_end(ab);
}
@ -2208,7 +2275,7 @@ void __audit_ptrace(struct task_struct *t)
{
struct audit_context *context = current->audit_context;
context->target_pid = t->pid;
context->target_pid = task_pid_nr(t);
context->target_auid = audit_get_loginuid(t);
context->target_uid = task_uid(t);
context->target_sessionid = audit_get_sessionid(t);
@ -2233,7 +2300,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
if (audit_pid && t->tgid == audit_pid) {
if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) {
audit_sig_pid = tsk->pid;
audit_sig_pid = task_pid_nr(tsk);
if (uid_valid(tsk->loginuid))
audit_sig_uid = tsk->loginuid;
else
@ -2247,7 +2314,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
/* optimize the common case by putting first signal recipient directly
* in audit_context */
if (!ctx->target_pid) {
ctx->target_pid = t->tgid;
ctx->target_pid = task_tgid_nr(t);
ctx->target_auid = audit_get_loginuid(t);
ctx->target_uid = t_uid;
ctx->target_sessionid = audit_get_sessionid(t);
@ -2268,7 +2335,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
}
BUG_ON(axp->pid_count >= AUDIT_AUX_PIDS);
axp->target_pid[axp->pid_count] = t->tgid;
axp->target_pid[axp->pid_count] = task_tgid_nr(t);
axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
axp->target_uid[axp->pid_count] = t_uid;
axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
@ -2368,7 +2435,7 @@ static void audit_log_task(struct audit_buffer *ab)
from_kgid(&init_user_ns, gid),
sessionid);
audit_log_task_context(ab);
audit_log_format(ab, " pid=%d comm=", current->pid);
audit_log_format(ab, " pid=%d comm=", task_pid_nr(current));
audit_log_untrustedstring(ab, current->comm);
if (mm) {
down_read(&mm->mmap_sem);

4
kernel/seccomp.c
View file

@ -71,7 +71,7 @@ static void populate_seccomp_data(struct seccomp_data *sd)
struct pt_regs *regs = task_pt_regs(task);
sd->nr = syscall_get_nr(task, regs);
sd->arch = syscall_get_arch(task, regs);
sd->arch = syscall_get_arch();
/* Unroll syscall_get_args to help gcc on arm. */
syscall_get_arguments(task, regs, 0, 1, (unsigned long *) &sd->args[0]);
@ -348,7 +348,7 @@ static void seccomp_send_sigsys(int syscall, int reason)
info.si_code = SYS_SECCOMP;
info.si_call_addr = (void __user *)KSTK_EIP(current);
info.si_errno = reason;
info.si_arch = syscall_get_arch(current, task_pt_regs(current));
info.si_arch = syscall_get_arch();
info.si_syscall = syscall;
force_sig_info(SIGSYS, &info, current);
}

9
lib/Kconfig
View file

@ -182,6 +182,15 @@ config AUDIT_GENERIC
depends on AUDIT && !AUDIT_ARCH
default y
config AUDIT_ARCH_COMPAT_GENERIC
bool
default n
config AUDIT_COMPAT_GENERIC
bool
depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
default y
config RANDOM32_SELFTEST
bool "PRNG perform self test on init"
default n

1
lib/Makefile
View file

@ -96,6 +96,7 @@ obj-$(CONFIG_TEXTSEARCH_BM) += ts_bm.o
obj-$(CONFIG_TEXTSEARCH_FSM) += ts_fsm.o
obj-$(CONFIG_SMP) += percpu_counter.o
obj-$(CONFIG_AUDIT_GENERIC) += audit.o
obj-$(CONFIG_AUDIT_COMPAT_GENERIC) += compat_audit.o
obj-$(CONFIG_SWIOTLB) += swiotlb.o
obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o

15
lib/audit.c
View file

@ -30,11 +30,17 @@ static unsigned signal_class[] = {
int audit_classify_arch(int arch)
{
return 0;
if (audit_is_compat(arch))
return 1;
else
return 0;
}
int audit_classify_syscall(int abi, unsigned syscall)
{
if (audit_is_compat(abi))
return audit_classify_compat_syscall(abi, syscall);
switch(syscall) {
#ifdef __NR_open
case __NR_open:
@ -57,6 +63,13 @@ int audit_classify_syscall(int abi, unsigned syscall)
static int __init audit_classes_init(void)
{
#ifdef CONFIG_AUDIT_COMPAT_GENERIC
audit_register_class(AUDIT_CLASS_WRITE_32, compat_write_class);
audit_register_class(AUDIT_CLASS_READ_32, compat_read_class);
audit_register_class(AUDIT_CLASS_DIR_WRITE_32, compat_dir_class);
audit_register_class(AUDIT_CLASS_CHATTR_32, compat_chattr_class);
audit_register_class(AUDIT_CLASS_SIGNAL_32, compat_signal_class);
#endif
audit_register_class(AUDIT_CLASS_WRITE, write_class);
audit_register_class(AUDIT_CLASS_READ, read_class);
audit_register_class(AUDIT_CLASS_DIR_WRITE, dir_class);

50
lib/compat_audit.c Normal file
View file

@ -0,0 +1,50 @@
#include <linux/init.h>
#include <linux/types.h>
#include <asm/unistd32.h>
unsigned compat_dir_class[] = {
#include <asm-generic/audit_dir_write.h>
~0U
};
unsigned compat_read_class[] = {
#include <asm-generic/audit_read.h>
~0U
};
unsigned compat_write_class[] = {
#include <asm-generic/audit_write.h>
~0U
};
unsigned compat_chattr_class[] = {
#include <asm-generic/audit_change_attr.h>
~0U
};
unsigned compat_signal_class[] = {
#include <asm-generic/audit_signal.h>
~0U
};
int audit_classify_compat_syscall(int abi, unsigned syscall)
{
switch (syscall) {
#ifdef __NR_open
case __NR_open:
return 2;
#endif
#ifdef __NR_openat
case __NR_openat:
return 3;
#endif
#ifdef __NR_socketcall
case __NR_socketcall:
return 4;
#endif
case __NR_execve:
return 5;
default:
return 1;
}
}

48
mm/util.c
View file

@ -446,6 +446,54 @@ unsigned long vm_commit_limit(void)
return allowed;
}
/**
* get_cmdline() - copy the cmdline value to a buffer.
* @task: the task whose cmdline value to copy.
* @buffer: the buffer to copy to.
* @buflen: the length of the buffer. Larger cmdline values are truncated
* to this length.
* Returns the size of the cmdline field copied. Note that the copy does
* not guarantee an ending NULL byte.
*/
int get_cmdline(struct task_struct *task, char *buffer, int buflen)
{
int res = 0;
unsigned int len;
struct mm_struct *mm = get_task_mm(task);
if (!mm)
goto out;
if (!mm->arg_end)
goto out_mm; /* Shh! No looking before we're done */
len = mm->arg_end - mm->arg_start;
if (len > buflen)
len = buflen;
res = access_process_vm(task, mm->arg_start, buffer, len, 0);
/*
* If the nul at the end of args has been overwritten, then
* assume application is using setproctitle(3).
*/
if (res > 0 && buffer[res-1] != '\0' && len < buflen) {
len = strnlen(buffer, res);
if (len < res) {
res = len;
} else {
len = mm->env_end - mm->env_start;
if (len > buflen - res)
len = buflen - res;
res += access_process_vm(task, mm->env_start,
buffer+res, len, 0);
res = strnlen(buffer, res);
}
}
out_mm:
mmput(mm);
out:
return res;
}
/* Tracepoints definitions. */
EXPORT_TRACEPOINT_SYMBOL(kmalloc);

2
security/integrity/integrity_audit.c
View file

@ -40,7 +40,7 @@ void integrity_audit_msg(int audit_msgno, struct inode *inode,
ab = audit_log_start(current->audit_context, GFP_KERNEL, audit_msgno);
audit_log_format(ab, "pid=%d uid=%u auid=%u ses=%u",
current->pid,
task_pid_nr(current),
from_kuid(&init_user_ns, current_cred()->uid),
from_kuid(&init_user_ns, audit_get_loginuid(current)),
audit_get_sessionid(current));

11
security/lsm_audit.c
View file

@ -220,7 +220,7 @@ static void dump_common_audit_data(struct audit_buffer *ab,
*/
BUILD_BUG_ON(sizeof(a->u) > sizeof(void *)*2);
audit_log_format(ab, " pid=%d comm=", tsk->pid);
audit_log_format(ab, " pid=%d comm=", task_pid_nr(tsk));
audit_log_untrustedstring(ab, tsk->comm);
switch (a->type) {
@ -278,9 +278,12 @@ static void dump_common_audit_data(struct audit_buffer *ab,
}
case LSM_AUDIT_DATA_TASK:
tsk = a->u.tsk;
if (tsk && tsk->pid) {
audit_log_format(ab, " pid=%d comm=", tsk->pid);
audit_log_untrustedstring(ab, tsk->comm);
if (tsk) {
pid_t pid = task_pid_nr(tsk);
if (pid) {
audit_log_format(ab, " pid=%d comm=", pid);
audit_log_untrustedstring(ab, tsk->comm);
}
}
break;
case LSM_AUDIT_DATA_NET: