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authorAKASHI Takahiro <takahiro.akashi@linaro.org>2014-03-15 01:48:00 -0400
committerEric Paris <eparis@redhat.com>2014-03-20 10:11:35 -0400
commit4b58841149dcaa500ceba1d5378ae70622fe4899 (patch)
tree0be5b9be6b140e6250a416acff517067fb6d5efd
parent7a017721283d3fd011a41884fd8e99beae8fe831 (diff)
audit: Add generic compat syscall support
lib/audit.c provides a generic function for auditing system calls. This patch extends it for compat syscall support on bi-architectures (32/64-bit) by adding lib/compat_audit.c. What is required to support this feature are: * add asm/unistd32.h for compat system call names * select CONFIG_AUDIT_ARCH_COMPAT_GENERIC Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Acked-by: Richard Guy Briggs <rgb@redhat.com> Signed-off-by: Eric Paris <eparis@redhat.com>
-rw-r--r--include/linux/audit.h8
-rw-r--r--include/uapi/linux/audit.h6
-rw-r--r--lib/Kconfig9
-rw-r--r--lib/Makefile1
-rw-r--r--lib/audit.c15
-rw-r--r--lib/compat_audit.c50
6 files changed, 88 insertions, 1 deletions
diff --git a/include/linux/audit.h b/include/linux/audit.h
index ec1464df4c60..4b2983e25ce0 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -79,6 +79,14 @@ extern int is_audit_feature_set(int which);
79extern int __init audit_register_class(int class, unsigned *list); 79extern int __init audit_register_class(int class, unsigned *list);
80extern int audit_classify_syscall(int abi, unsigned syscall); 80extern int audit_classify_syscall(int abi, unsigned syscall);
81extern int audit_classify_arch(int arch); 81extern int audit_classify_arch(int arch);
82/* only for compat system calls */
83extern unsigned compat_write_class[];
84extern unsigned compat_read_class[];
85extern unsigned compat_dir_class[];
86extern unsigned compat_chattr_class[];
87extern unsigned compat_signal_class[];
88
89extern int __weak audit_classify_compat_syscall(int abi, unsigned syscall);
82 90
83/* audit_names->type values */ 91/* audit_names->type values */
84#define AUDIT_TYPE_UNKNOWN 0 /* we don't know yet */ 92#define AUDIT_TYPE_UNKNOWN 0 /* we don't know yet */
diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index 4315ee99b967..9af01d77dc44 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -362,6 +362,12 @@ enum {
362#define AUDIT_ARCH_SPARC64 (EM_SPARCV9|__AUDIT_ARCH_64BIT) 362#define AUDIT_ARCH_SPARC64 (EM_SPARCV9|__AUDIT_ARCH_64BIT)
363#define AUDIT_ARCH_X86_64 (EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE) 363#define AUDIT_ARCH_X86_64 (EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
364 364
365#ifdef CONFIG_COMPAT
366#define audit_is_compat(arch) (!((arch) & __AUDIT_ARCH_64BIT))
367#else
368#define audit_is_compat(arch) false
369#endif
370
365#define AUDIT_PERM_EXEC 1 371#define AUDIT_PERM_EXEC 1
366#define AUDIT_PERM_WRITE 2 372#define AUDIT_PERM_WRITE 2
367#define AUDIT_PERM_READ 4 373#define AUDIT_PERM_READ 4
diff --git a/lib/Kconfig b/lib/Kconfig
index 991c98bc4a3f..1e80cb3c77a9 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -182,6 +182,15 @@ config AUDIT_GENERIC
182 depends on AUDIT && !AUDIT_ARCH 182 depends on AUDIT && !AUDIT_ARCH
183 default y 183 default y
184 184
185config AUDIT_ARCH_COMPAT_GENERIC
186 bool
187 default n
188
189config AUDIT_COMPAT_GENERIC
190 bool
191 depends on AUDIT_GENERIC && AUDIT_ARCH_COMPAT_GENERIC && COMPAT
192 default y
193
185config RANDOM32_SELFTEST 194config RANDOM32_SELFTEST
186 bool "PRNG perform self test on init" 195 bool "PRNG perform self test on init"
187 default n 196 default n
diff --git a/lib/Makefile b/lib/Makefile
index a459c31e8c6b..972552b39cf5 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -93,6 +93,7 @@ obj-$(CONFIG_TEXTSEARCH_BM) += ts_bm.o
93obj-$(CONFIG_TEXTSEARCH_FSM) += ts_fsm.o 93obj-$(CONFIG_TEXTSEARCH_FSM) += ts_fsm.o
94obj-$(CONFIG_SMP) += percpu_counter.o 94obj-$(CONFIG_SMP) += percpu_counter.o
95obj-$(CONFIG_AUDIT_GENERIC) += audit.o 95obj-$(CONFIG_AUDIT_GENERIC) += audit.o
96obj-$(CONFIG_AUDIT_COMPAT_GENERIC) += compat_audit.o
96 97
97obj-$(CONFIG_SWIOTLB) += swiotlb.o 98obj-$(CONFIG_SWIOTLB) += swiotlb.o
98obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o 99obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o
diff --git a/lib/audit.c b/lib/audit.c
index 76bbed4a20e5..1d726a22565b 100644
--- a/lib/audit.c
+++ b/lib/audit.c
@@ -30,11 +30,17 @@ static unsigned signal_class[] = {
30 30
31int audit_classify_arch(int arch) 31int audit_classify_arch(int arch)
32{ 32{
33 return 0; 33 if (audit_is_compat(arch))
34 return 1;
35 else
36 return 0;
34} 37}
35 38
36int audit_classify_syscall(int abi, unsigned syscall) 39int audit_classify_syscall(int abi, unsigned syscall)
37{ 40{
41 if (audit_is_compat(abi))
42 return audit_classify_compat_syscall(abi, syscall);
43
38 switch(syscall) { 44 switch(syscall) {
39#ifdef __NR_open 45#ifdef __NR_open
40 case __NR_open: 46 case __NR_open:
@@ -57,6 +63,13 @@ int audit_classify_syscall(int abi, unsigned syscall)
57 63
58static int __init audit_classes_init(void) 64static int __init audit_classes_init(void)
59{ 65{
66#ifdef CONFIG_AUDIT_COMPAT_GENERIC
67 audit_register_class(AUDIT_CLASS_WRITE_32, compat_write_class);
68 audit_register_class(AUDIT_CLASS_READ_32, compat_read_class);
69 audit_register_class(AUDIT_CLASS_DIR_WRITE_32, compat_dir_class);
70 audit_register_class(AUDIT_CLASS_CHATTR_32, compat_chattr_class);
71 audit_register_class(AUDIT_CLASS_SIGNAL_32, compat_signal_class);
72#endif
60 audit_register_class(AUDIT_CLASS_WRITE, write_class); 73 audit_register_class(AUDIT_CLASS_WRITE, write_class);
61 audit_register_class(AUDIT_CLASS_READ, read_class); 74 audit_register_class(AUDIT_CLASS_READ, read_class);
62 audit_register_class(AUDIT_CLASS_DIR_WRITE, dir_class); 75 audit_register_class(AUDIT_CLASS_DIR_WRITE, dir_class);
diff --git a/lib/compat_audit.c b/lib/compat_audit.c
new file mode 100644
index 000000000000..873f75b640ab
--- /dev/null
+++ b/lib/compat_audit.c
@@ -0,0 +1,50 @@
1#include <linux/init.h>
2#include <linux/types.h>
3#include <asm/unistd32.h>
4
5unsigned compat_dir_class[] = {
6#include <asm-generic/audit_dir_write.h>
7~0U
8};
9
10unsigned compat_read_class[] = {
11#include <asm-generic/audit_read.h>
12~0U
13};
14
15unsigned compat_write_class[] = {
16#include <asm-generic/audit_write.h>
17~0U
18};
19
20unsigned compat_chattr_class[] = {
21#include <asm-generic/audit_change_attr.h>
22~0U
23};
24
25unsigned compat_signal_class[] = {
26#include <asm-generic/audit_signal.h>
27~0U
28};
29
30int audit_classify_compat_syscall(int abi, unsigned syscall)
31{
32 switch (syscall) {
33#ifdef __NR_open
34 case __NR_open:
35 return 2;
36#endif
37#ifdef __NR_openat
38 case __NR_openat:
39 return 3;
40#endif
41#ifdef __NR_socketcall
42 case __NR_socketcall:
43 return 4;
44#endif
45 case __NR_execve:
46 return 5;
47 default:
48 return 1;
49 }
50}