From a60c3f654ec5bc766c6dbf0bc200710baf42d956 Mon Sep 17 00:00:00 2001
From: ChenXiaoSong <chenxiaosong@chenxiaosong.com>
Date: Thu, 10 Oct 2024 04:19:08 +0000
Subject: [PATCH] add new syscall openat_test

Signed-off-by: ChenXiaoSong <chenxiaosong@chenxiaosong.com>
---
 arch/x86/entry/syscalls/syscall_32.tbl | 1 +
 arch/x86/entry/syscalls/syscall_64.tbl | 1 +
 fs/open.c                              | 6 ++++++
 include/linux/syscalls.h               | 1 +
 include/uapi/asm-generic/unistd.h      | 5 ++++-
 5 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
index 534c74b14fab..b7eb11a1671f 100644
--- a/arch/x86/entry/syscalls/syscall_32.tbl
+++ b/arch/x86/entry/syscalls/syscall_32.tbl
@@ -468,3 +468,4 @@
 460	i386	lsm_set_self_attr	sys_lsm_set_self_attr
 461	i386	lsm_list_modules	sys_lsm_list_modules
 462	i386	mseal 			sys_mseal
+463	i386	openat_test		sys_openat_test
diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
index 7093ee21c0d1..c77a1ad8c54d 100644
--- a/arch/x86/entry/syscalls/syscall_64.tbl
+++ b/arch/x86/entry/syscalls/syscall_64.tbl
@@ -386,6 +386,7 @@
 460	common	lsm_set_self_attr	sys_lsm_set_self_attr
 461	common	lsm_list_modules	sys_lsm_list_modules
 462 	common  mseal			sys_mseal
+463	common	openat_test		sys_openat_test
 
 #
 # Due to a historical design error, certain syscalls are numbered differently
diff --git a/fs/open.c b/fs/open.c
index acaeb3e25c88..aed24c428302 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -1446,6 +1446,12 @@ SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags,
 	return do_sys_open(dfd, filename, flags, mode);
 }
 
+SYSCALL_DEFINE1(openat_test, int, data)
+{
+	printk("openat_test syscall, data: %d\n", data);
+	return 5555;
+}
+
 SYSCALL_DEFINE4(openat2, int, dfd, const char __user *, filename,
 		struct open_how __user *, how, size_t, usize)
 {
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 5758104921e6..ba16d562c80e 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -440,6 +440,7 @@ asmlinkage long sys_fchownat(int dfd, const char __user *filename, uid_t user,
 asmlinkage long sys_fchown(unsigned int fd, uid_t user, gid_t group);
 asmlinkage long sys_openat(int dfd, const char __user *filename, int flags,
 			   umode_t mode);
+asmlinkage long sys_openat_test(int data);
 asmlinkage long sys_openat2(int dfd, const char __user *filename,
 			    struct open_how __user *how, size_t size);
 asmlinkage long sys_close(unsigned int fd);
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index 5bf6148cac2b..1b6d056825da 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -841,8 +841,11 @@ __SYSCALL(__NR_lsm_list_modules, sys_lsm_list_modules)
 #define __NR_mseal 462
 __SYSCALL(__NR_mseal, sys_mseal)
 
+#define __NR_openat_test 463
+__SYSCALL(__NR_openat_test, sys_openat_test)
+
 #undef __NR_syscalls
-#define __NR_syscalls 463
+#define __NR_syscalls 464
 
 /*
  * 32 bit systems traditionally used different
-- 
2.34.1