signal audit (v3)

PATCH New Amy Griffis 1 participant 3 messages Mar 29, 2007

Subsystems (5)

PowerPC Library code s390 Generic include/asm header files +1 more subsystems

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Amy Griffis

author

2007-03-29 22:02 UTC #0 lore raw

cover signal audit (v3)

Several changes since last version:
- use arch rule field to determine which signal class to check, check both if arch is unspecified
- don't check AUDIT_CLASS_SIGNAL_32 if it doesn't exist
- group target pids in aux structs (initially 16)
- on syscall exit, initialize context's aux ptrs for re-use
- don't convert sid to string until we log a record

Applies on top of ptrace patch.

Amy Griffis

author

2007-03-29 22:02 UTC #1 lore raw

PATCH 1/2 add SIGNAL syscall class (v3)

Add a syscall class for sending signals.

Signed-off-by Amy Griffis <[email protected]>

---
 arch/ia64/ia32/audit.c             |    5 +++++
 arch/ia64/kernel/audit.c           |    8 ++++++++
 arch/powerpc/kernel/audit.c        |    8 ++++++++
 arch/powerpc/kernel/compat_audit.c |    5 +++++
 arch/s390/kernel/audit.c           |    8 ++++++++
 arch/s390/kernel/compat_audit.c    |    5 +++++
 arch/sparc64/kernel/audit.c        |    8 ++++++++
 arch/sparc64/kernel/compat_audit.c |    5 +++++
 arch/x86_64/ia32/audit.c           |    5 +++++
 arch/x86_64/kernel/audit.c         |    8 ++++++++
 include/asm-generic/audit_signal.h |    3 +++
 include/linux/audit.h              |    2 ++
 lib/audit.c                        |    6 ++++++
 13 files changed, 76 insertions(+), 0 deletions(-)

arch/ia64/ia32/audit.c +5 -0

index 92d7d0c..8850fe4 100644
@@ -20,6 +20,11 @@ unsigned ia32_read_class[] = {
 ~0U
 };
 
+unsigned ia32_signal_class[] = {
+#include <asm-generic/audit_signal.h>
+~0U
+};
+
 int ia32_classify_syscall(unsigned syscall)
 {
 	switch(syscall) {

arch/ia64/kernel/audit.c +8 -0

index 0468255..538312a 100644
@@ -23,6 +23,11 @@ static unsigned chattr_class[] = {
 ~0U
 };
 
+static unsigned signal_class[] = {
+#include <asm-generic/audit_signal.h>
+~0U
+};
+
 int audit_classify_syscall(int abi, unsigned syscall)
 {
 #ifdef CONFIG_IA32_SUPPORT

@@ -49,15 +54,18 @@ static int __init audit_classes_init(void)
 	extern __u32 ia32_write_class[];
 	extern __u32 ia32_read_class[];
 	extern __u32 ia32_chattr_class[];
+	extern __u32 ia32_signal_class[];
 	audit_register_class(AUDIT_CLASS_WRITE_32, ia32_write_class);
 	audit_register_class(AUDIT_CLASS_READ_32, ia32_read_class);
 	audit_register_class(AUDIT_CLASS_DIR_WRITE_32, ia32_dir_class);
 	audit_register_class(AUDIT_CLASS_CHATTR_32, ia32_chattr_class);
+	audit_register_class(AUDIT_CLASS_SIGNAL_32, ia32_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);
 	audit_register_class(AUDIT_CLASS_CHATTR, chattr_class);
+	audit_register_class(AUDIT_CLASS_SIGNAL, signal_class);
 	return 0;
 }

arch/powerpc/kernel/audit.c +8 -0

index 7fe5e63..66d54ba 100644
@@ -23,6 +23,11 @@ static unsigned chattr_class[] = {
 ~0U
 };
 
+static unsigned signal_class[] = {
+#include <asm-generic/audit_signal.h>
+~0U
+};
+
 int audit_classify_syscall(int abi, unsigned syscall)
 {
 #ifdef CONFIG_PPC64

@@ -51,15 +56,18 @@ static int __init audit_classes_init(void)
 	extern __u32 ppc32_write_class[];
 	extern __u32 ppc32_read_class[];
 	extern __u32 ppc32_chattr_class[];
+	extern __u32 ppc32_signal_class[];
 	audit_register_class(AUDIT_CLASS_WRITE_32, ppc32_write_class);
 	audit_register_class(AUDIT_CLASS_READ_32, ppc32_read_class);
 	audit_register_class(AUDIT_CLASS_DIR_WRITE_32, ppc32_dir_class);
 	audit_register_class(AUDIT_CLASS_CHATTR_32, ppc32_chattr_class);
+	audit_register_class(AUDIT_CLASS_SIGNAL_32, ppc32_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);
 	audit_register_class(AUDIT_CLASS_CHATTR, chattr_class);
+	audit_register_class(AUDIT_CLASS_SIGNAL, signal_class);
 	return 0;
 }

arch/powerpc/kernel/compat_audit.c +5 -0

index 640d4bb..108ff14 100644
@@ -21,6 +21,11 @@ unsigned ppc32_read_class[] = {
 ~0U
 };
 
+unsigned ppc32_signal_class[] = {
+#include <asm-generic/audit_signal.h>
+~0U
+};
+
 int ppc32_classify_syscall(unsigned syscall)
 {
 	switch(syscall) {

arch/s390/kernel/audit.c +8 -0

index 0741d91..7affafe 100644
@@ -23,6 +23,11 @@ static unsigned chattr_class[] = {
 ~0U
 };
 
+static unsigned signal_class[] = {
+#include <asm-generic/audit_signal.h>
+~0U
+};
+
 int audit_classify_syscall(int abi, unsigned syscall)
 {
 #ifdef CONFIG_COMPAT

@@ -51,15 +56,18 @@ static int __init audit_classes_init(void)
 	extern __u32 s390_write_class[];
 	extern __u32 s390_read_class[];
 	extern __u32 s390_chattr_class[];
+	extern __u32 s390_signal_class[];
 	audit_register_class(AUDIT_CLASS_WRITE_32, s390_write_class);
 	audit_register_class(AUDIT_CLASS_READ_32, s390_read_class);
 	audit_register_class(AUDIT_CLASS_DIR_WRITE_32, s390_dir_class);
 	audit_register_class(AUDIT_CLASS_CHATTR_32, s390_chattr_class);
+	audit_register_class(AUDIT_CLASS_SIGNAL_32, s390_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);
 	audit_register_class(AUDIT_CLASS_CHATTR, chattr_class);
+	audit_register_class(AUDIT_CLASS_SIGNAL, signal_class);
 	return 0;
 }

arch/s390/kernel/compat_audit.c +5 -0

index 16d9436..0569f51 100644
@@ -21,6 +21,11 @@ unsigned s390_read_class[] = {
 ~0U
 };
 
+unsigned s390_signal_class[] = {
+#include <asm-generic/audit_signal.h>
+~0U
+};
+
 int s390_classify_syscall(unsigned syscall)
 {
 	switch(syscall) {

arch/sparc64/kernel/audit.c +8 -0

index aef19cc..d57a9da 100644
@@ -23,6 +23,11 @@ static unsigned chattr_class[] = {
 ~0U
 };
 
+static unsigned signal_class[] = {
+#include <asm-generic/audit_signal.h>
+~0U
+};
+
 int audit_classify_syscall(int abi, unsigned syscall)
 {
 #ifdef CONFIG_SPARC32_COMPAT

@@ -51,15 +56,18 @@ static int __init audit_classes_init(void)
 	extern __u32 sparc32_write_class[];
 	extern __u32 sparc32_read_class[];
 	extern __u32 sparc32_chattr_class[];
+	extern __u32 sparc32_signal_class[];
 	audit_register_class(AUDIT_CLASS_WRITE_32, sparc32_write_class);
 	audit_register_class(AUDIT_CLASS_READ_32, sparc32_read_class);
 	audit_register_class(AUDIT_CLASS_DIR_WRITE_32, sparc32_dir_class);
 	audit_register_class(AUDIT_CLASS_CHATTR_32, sparc32_chattr_class);
+	audit_register_class(AUDIT_CLASS_SIGNAL_32, sparc32_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);
 	audit_register_class(AUDIT_CLASS_CHATTR, chattr_class);
+	audit_register_class(AUDIT_CLASS_SIGNAL, signal_class);
 	return 0;
 }

arch/sparc64/kernel/compat_audit.c +5 -0

index cca96c9..c197948 100644
@@ -20,6 +20,11 @@ unsigned sparc32_read_class[] = {
 ~0U
 };
 
+unsigned sparc32_signal_class[] = {
+#include <asm-generic/audit_signal.h>
+~0U
+};
+
 int sparc32_classify_syscall(unsigned syscall)
 {
 	switch(syscall) {

arch/x86_64/ia32/audit.c +5 -0

index 92d7d0c..8850fe4 100644
@@ -20,6 +20,11 @@ unsigned ia32_read_class[] = {
 ~0U
 };
 
+unsigned ia32_signal_class[] = {
+#include <asm-generic/audit_signal.h>
+~0U
+};
+
 int ia32_classify_syscall(unsigned syscall)
 {
 	switch(syscall) {

arch/x86_64/kernel/audit.c +8 -0

index 21f3338..b970de6 100644
@@ -23,6 +23,11 @@ static unsigned chattr_class[] = {
 ~0U
 };
 
+static unsigned signal_class[] = {
+#include <asm-generic/audit_signal.h>
+~0U
+};
+
 int audit_classify_syscall(int abi, unsigned syscall)
 {
 #ifdef CONFIG_IA32_EMULATION

@@ -49,15 +54,18 @@ static int __init audit_classes_init(void)
 	extern __u32 ia32_write_class[];
 	extern __u32 ia32_read_class[];
 	extern __u32 ia32_chattr_class[];
+	extern __u32 ia32_signal_class[];
 	audit_register_class(AUDIT_CLASS_WRITE_32, ia32_write_class);
 	audit_register_class(AUDIT_CLASS_READ_32, ia32_read_class);
 	audit_register_class(AUDIT_CLASS_DIR_WRITE_32, ia32_dir_class);
 	audit_register_class(AUDIT_CLASS_CHATTR_32, ia32_chattr_class);
+	audit_register_class(AUDIT_CLASS_SIGNAL_32, ia32_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);
 	audit_register_class(AUDIT_CLASS_CHATTR, chattr_class);
+	audit_register_class(AUDIT_CLASS_SIGNAL, signal_class);
 	return 0;
 }

include/asm-generic/audit_signal.h new file +3 -0

new file mode 100644
index 0000000..6feab7f
@@ -0,0 +1,3 @@
+__NR_kill,
+__NR_tgkill,
+__NR_tkill,

include/linux/audit.h +2 -0

index c024c82..e4bd622 100644
@@ -149,6 +149,8 @@
 #define AUDIT_CLASS_READ_32 5
 #define AUDIT_CLASS_WRITE 6
 #define AUDIT_CLASS_WRITE_32 7
+#define AUDIT_CLASS_SIGNAL 8
+#define AUDIT_CLASS_SIGNAL_32 9
 
 /* This bitmask is used to validate user input.  It represents all bits that
  * are currently used in an audit field constant understood by the kernel.

lib/audit.c +6 -0

index 3b1289f..50e9152 100644
@@ -23,6 +23,11 @@ static unsigned chattr_class[] = {
 ~0U
 };
 
+static unsigned signal_class[] = {
+#include <asm-generic/audit_signal.h>
+~0U
+};
+
 int audit_classify_syscall(int abi, unsigned syscall)
 {
 	switch(syscall) {

@@ -49,6 +54,7 @@ static int __init audit_classes_init(void)
 	audit_register_class(AUDIT_CLASS_READ, read_class);
 	audit_register_class(AUDIT_CLASS_DIR_WRITE, dir_class);
 	audit_register_class(AUDIT_CLASS_CHATTR, chattr_class);
+	audit_register_class(AUDIT_CLASS_SIGNAL, signal_class);
 	return 0;
 }

Signature · 1 line

1.4.4.4

Amy Griffis

author

2007-03-29 22:01 UTC #2 lore raw

PATCH 2/2 audit signal recipients (v3)

In reply to Amy Griffis

When auditing syscalls that send signals, log the pid and security context for each target process. Optimize the data collection by adding a counter for signal-related rules, and avoiding allocating an aux struct unless we have more than one target process. For process groups, collect pid/context data in blocks of 16. Move the audit_signal_info() hook up in check_kill_permission() so we audit attempts where permission is denied.

Signed-off-by Amy Griffis <[email protected]>

---
 arch/ia64/kernel/audit.c    |    9 +++
 arch/powerpc/kernel/audit.c |    9 +++
 arch/s390/kernel/audit.c    |    9 +++
 arch/sparc64/kernel/audit.c |    9 +++
 arch/x86_64/kernel/audit.c  |    9 +++
 include/linux/audit.h       |    3 +
 kernel/audit.h              |   13 +++--
 kernel/auditfilter.c        |   48 +++++++++++++++++-
 kernel/auditsc.c            |  116 ++++++++++++++++++++++++++++++++++--------
 kernel/signal.c             |   10 ++--
 lib/audit.c                 |    5 ++
 11 files changed, 208 insertions(+), 32 deletions(-)

arch/ia64/kernel/audit.c +9 -0

index 538312a..f3802ae 100644
@@ -28,6 +28,15 @@ static unsigned signal_class[] = {
 ~0U
 };
 
+int audit_classify_arch(int arch)
+{
+#ifdef CONFIG_IA32_SUPPORT
+	if (arch == AUDIT_ARCH_I386)
+		return 1;
+#endif
+	return 0;
+}
+
 int audit_classify_syscall(int abi, unsigned syscall)
 {
 #ifdef CONFIG_IA32_SUPPORT

arch/powerpc/kernel/audit.c +9 -0

index 66d54ba..a4dab7c 100644
@@ -28,6 +28,15 @@ static unsigned signal_class[] = {
 ~0U
 };
 
+int audit_classify_arch(int arch)
+{
+#ifdef CONFIG_PPC64
+	if (arch == AUDIT_ARCH_PPC)
+		return 1;
+#endif
+	return 0;
+}
+
 int audit_classify_syscall(int abi, unsigned syscall)
 {
 #ifdef CONFIG_PPC64

arch/s390/kernel/audit.c +9 -0

index 7affafe..d1c76fe 100644
@@ -28,6 +28,15 @@ static unsigned signal_class[] = {
 ~0U
 };
 
+int audit_classify_arch(int arch)
+{
+#ifdef CONFIG_COMPAT
+	if (arch == AUDIT_ARCH_S390)
+		return 1;
+#endif
+	return 0;
+}
+
 int audit_classify_syscall(int abi, unsigned syscall)
 {
 #ifdef CONFIG_COMPAT

arch/sparc64/kernel/audit.c +9 -0

index d57a9da..24d7f4b 100644
@@ -28,6 +28,15 @@ static unsigned signal_class[] = {
 ~0U
 };
 
+int audit_classify_arch(int arch)
+{
+#ifdef CONFIG_SPARC32_COMPAT
+	if (arch == AUDIT_ARCH_SPARC)
+		return 1;
+#endif
+	return 0;
+}
+
 int audit_classify_syscall(int abi, unsigned syscall)
 {
 #ifdef CONFIG_SPARC32_COMPAT

arch/x86_64/kernel/audit.c +9 -0

index b970de6..06d3e5a 100644
@@ -28,6 +28,15 @@ static unsigned signal_class[] = {
 ~0U
 };
 
+int audit_classify_arch(int arch)
+{
+#ifdef CONFIG_IA32_EMULATION
+	if (arch == AUDIT_ARCH_I386)
+		return 1;
+#endif
+	return 0;
+}
+
 int audit_classify_syscall(int abi, unsigned syscall)
 {
 #ifdef CONFIG_IA32_EMULATION

include/linux/audit.h +3 -0

index e4bd622..ac84347 100644
@@ -344,6 +344,7 @@ struct mqstat;
 #define AUDITSC_RESULT(x) ( ((long)(x))<0?AUDITSC_FAILURE:AUDITSC_SUCCESS )
 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);
 #ifdef CONFIG_AUDITSYSCALL
 /* These are defined in auditsc.c */
 				/* Public API */

@@ -456,6 +457,7 @@ static inline int audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 	return 0;
 }
 extern int audit_n_rules;
+extern int audit_signals;
 #else
 #define audit_alloc(t) ({ 0; })
 #define audit_free(t) do { ; } while (0)

@@ -486,6 +488,7 @@ extern int audit_n_rules;
 #define audit_mq_getsetattr(d,s) ({ 0; })
 #define audit_ptrace(t) ((void)0)
 #define audit_n_rules 0
+#define audit_signals 0
 #endif
 
 #ifdef CONFIG_AUDIT

kernel/audit.h +8 -5

index a337023..815d6f5 100644
@@ -83,6 +83,7 @@ struct audit_krule {
 	u32			field_count;
 	char			*filterkey; /* ties events to rules */
 	struct audit_field	*fields;
+	struct audit_field	*arch_f; /* quick access to arch field */
 	struct audit_field	*inode_f; /* quick access to an inode field */
 	struct audit_watch	*watch;	/* associated watch */
 	struct list_head	rlist;	/* entry in audit_watch.rules list */

@@ -131,17 +132,19 @@ extern void audit_handle_ievent(struct inotify_watch *, u32, u32, u32,
 extern int selinux_audit_rule_update(void);
 
 #ifdef CONFIG_AUDITSYSCALL
-extern void __audit_signal_info(int sig, struct task_struct *t);
-static inline void audit_signal_info(int sig, struct task_struct *t)
+extern int __audit_signal_info(int sig, struct task_struct *t);
+static inline int audit_signal_info(int sig, struct task_struct *t)
 {
-	if (unlikely(audit_pid && t->tgid == audit_pid))
-		__audit_signal_info(sig, t);
+	if (unlikely((audit_pid && t->tgid == audit_pid) ||
+		     (audit_signals && !audit_dummy_context())))
+		return __audit_signal_info(sig, t);
+	return 0;
 }
 extern enum audit_state audit_filter_inodes(struct task_struct *,
 					    struct audit_context *);
 extern void audit_set_auditable(struct audit_context *);
 #else
-#define audit_signal_info(s,t)
+#define audit_signal_info(s,t) AUDIT_DISABLED
 #define audit_filter_inodes(t,c) AUDIT_DISABLED
 #define audit_set_auditable(c)
 #endif

kernel/auditfilter.c +47 -1

84 lines not on this page · raw message

kernel/auditsc.c +94 ~~-22~~

202 lines not on this page · raw message

kernel/signal.c +6 -4

index 3670225..91d88eb 100644
@@ -607,6 +607,11 @@ static int check_kill_permission(int sig, struct siginfo *info,
 	int error = -EINVAL;
 	if (!valid_signal(sig))
 		return error;
+
+	error = audit_signal_info(sig, t); /* Let audit system see the signal */
+	if (error)
+		return error;
+
 	error = -EPERM;
 	if ((info == SEND_SIG_NOINFO || (!is_si_special(info) && SI_FROMUSER(info)))
 	    && ((sig != SIGCONT) ||

@@ -616,10 +621,7 @@ static int check_kill_permission(int sig, struct siginfo *info,
 	    && !capable(CAP_KILL))
 		return error;
 
-	error = security_task_kill(t, info, sig, 0);
-	if (!error)
-		audit_signal_info(sig, t); /* Let audit system see the signal */
-	return error;
+	return security_task_kill(t, info, sig, 0);
 }
 
 /* forward decl */

lib/audit.c +5 -0

index 50e9152..8e7dc1c 100644
@@ -28,6 +28,11 @@ static unsigned signal_class[] = {
 ~0U
 };
 
+int audit_classify_arch(int arch)
+{
+	return 0;
+}
+
 int audit_classify_syscall(int abi, unsigned syscall)
 {
 	switch(syscall) {

Signature · 1 line

1.4.4.4