arm64: fix AUDIT_ARCH_AARCH64ILP32 bug on audit subsystem

hulk inclusion
category: bugfix
bugzilla: 174525 https://gitee.com/openeuler/kernel/issues/I4DDEL

--------

In arm64be_ilp32 platform, audit could not record log in some case, because
syscall_get_arch() in arch/arm64 returns AUDIT_ARCH_AARCH64ILP32, which
fits the arm32 platform. Audit will gets a fault arch in this
situation and hence mismatch some syscall numbers in audit_match_perm().

This patch fixes it, and use the arch AUDIT_ARCH_AARCH64 which matches
all syscall numbers in arm64be_ilp32 platform.

Fixes: 0fe4141ba63a ("[Backport] arm64: introduce AUDIT_ARCH_AARCH64ILP32 for ilp32")
Signed-off-by: NChen Jiahao <chenjiahao16@huawei.com>
Reviewed-by: NLiao Chang <liaochang1@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/arm64/include/asm/syscall.h

@@ -95,9 +95,6 @@ static inline int syscall_get_arch(struct task_struct *task)
 	if (is_a32_compat_thread(task_thread_info(task)))
 		return AUDIT_ARCH_ARM;
 
-	else if (is_ilp32_compat_task())
-		return AUDIT_ARCH_AARCH64ILP32;
-
 	return AUDIT_ARCH_AARCH64;
 }
 

include/uapi/linux/audit.h

@@ -381,7 +381,6 @@ enum {
 #define __AUDIT_ARCH_LE	   0x40000000
 
 #define AUDIT_ARCH_AARCH64	(EM_AARCH64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
-#define AUDIT_ARCH_AARCH64ILP32	(EM_AARCH64|__AUDIT_ARCH_LE)
 #define AUDIT_ARCH_ALPHA	(EM_ALPHA|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
 #define AUDIT_ARCH_ARCOMPACT	(EM_ARCOMPACT|__AUDIT_ARCH_LE)
 #define AUDIT_ARCH_ARCOMPACTBE	(EM_ARCOMPACT)