[PATCH v2] loongarch: Support RANDOMIZE_KSTACK_OFFSET

[Jinjie Ruan]

Add support of kernel stack offset randomization while handling syscall,
the offset is defaultly limited by KSTACK_OFFSET_MAX().

In order to avoid trigger stack canaries (due to __builtin_alloca) and
slowing down the entry path, use __no_stack_protector attribute to
disable stack protector for do_syscall() at function level.

With this patch, the REPORT_STACK test show that:
	`loongarch64 bits of stack entropy: 7`

Signed-off-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>
Suggested-by: Huacai Chen <chenhuacai@xxxxxxxxxx>
---
v2:
- get_random_u16() -> drdtime().
- Add Suggested-by.
---
 arch/loongarch/Kconfig          |  1 +
 arch/loongarch/kernel/syscall.c | 17 ++++++++++++++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index ddc042895d01..fcf6451b4e38 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -106,6 +106,7 @@ config LOONGARCH
 	select HAVE_ARCH_KFENCE
 	select HAVE_ARCH_KGDB if PERF_EVENTS
 	select HAVE_ARCH_MMAP_RND_BITS if MMU
+	select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
 	select HAVE_ARCH_SECCOMP
 	select HAVE_ARCH_SECCOMP_FILTER
 	select HAVE_ARCH_TRACEHOOK
diff --git a/arch/loongarch/kernel/syscall.c b/arch/loongarch/kernel/syscall.c
index ec17cd5163b7..9df81197a09b 100644
--- a/arch/loongarch/kernel/syscall.c
+++ b/arch/loongarch/kernel/syscall.c
@@ -9,11 +9,13 @@
 #include <linux/entry-common.h>
 #include <linux/errno.h>
 #include <linux/linkage.h>
+#include <linux/randomize_kstack.h>
 #include <linux/syscalls.h>
 #include <linux/unistd.h>
 
 #include <asm/asm.h>
 #include <asm/exception.h>
+#include <asm/loongarch.h>
 #include <asm/signal.h>
 #include <asm/switch_to.h>
 #include <asm-generic/syscalls.h>
@@ -39,7 +41,7 @@ void *sys_call_table[__NR_syscalls] = {
 typedef long (*sys_call_fn)(unsigned long, unsigned long,
 	unsigned long, unsigned long, unsigned long, unsigned long);
 
-void noinstr do_syscall(struct pt_regs *regs)
+__no_stack_protector void noinstr do_syscall(struct pt_regs *regs)
 {
 	unsigned long nr;
 	sys_call_fn syscall_fn;
@@ -55,11 +57,24 @@ void noinstr do_syscall(struct pt_regs *regs)
 
 	nr = syscall_enter_from_user_mode(regs, nr);
 
+	add_random_kstack_offset();
+
 	if (nr < NR_syscalls) {
 		syscall_fn = sys_call_table[nr];
 		regs->regs[4] = syscall_fn(regs->orig_a0, regs->regs[5], regs->regs[6],
 					   regs->regs[7], regs->regs[8], regs->regs[9]);
 	}
 
+	/*
+	 * This value will get limited by KSTACK_OFFSET_MAX(), which is 10
+	 * bits. The actual entropy will be further reduced by the compiler
+	 * when applying stack alignment constraints: 16-byte (i.e. 4-bit)
+	 * aligned, which will remove the 4 low bits from any entropy chosen
+	 * here.
+	 *
+	 * The resulting 6 bits of entropy is seen in SP[9:4].
+	 */
+	choose_random_kstack_offset(drdtime());
+
 	syscall_exit_to_user_mode(regs);
 }
-- 
2.34.1