From: Jisheng Zhang <jszhang3@mail.ustc.edu.cn>
To: "Paul Walmsley" <paul.walmsley@sifive.com>,
"Palmer Dabbelt" <palmer@dabbelt.com>,
"Albert Ou" <aou@eecs.berkeley.edu>,
"Andrey Ryabinin" <ryabinin.a.a@gmail.com>,
"Alexander Potapenko" <glider@google.com>,
"Andrey Konovalov" <andreyknvl@gmail.com>,
"Dmitry Vyukov" <dvyukov@google.com>,
" Björn Töpel" <bjorn@kernel.org>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Song Liu" <songliubraving@fb.com>, "Yonghong Song" <yhs@fb.com>,
"John Fastabend" <john.fastabend@gmail.com>,
"KP Singh" <kpsingh@kernel.org>,
"Luke Nelson" <luke.r.nels@gmail.com>,
"Xi Wang" <xi.wang@gmail.com>
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
kasan-dev@googlegroups.com, netdev@vger.kernel.org,
bpf@vger.kernel.org
Subject: [PATCH v2 3/9] riscv: Constify sys_call_table
Date: Thu, 1 Apr 2021 00:26:21 +0800 [thread overview]
Message-ID: <20210401002621.409624ee@xhacker> (raw)
In-Reply-To: <20210401002442.2fe56b88@xhacker>
From: Jisheng Zhang <jszhang@kernel.org>
Constify the sys_call_table so that it will be placed in the .rodata
section. This will cause attempts to modify the table to fail when
strict page permissions are in place.
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
---
arch/riscv/include/asm/syscall.h | 2 +-
arch/riscv/kernel/syscall_table.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/riscv/include/asm/syscall.h b/arch/riscv/include/asm/syscall.h
index 49350c8bd7b0..b933b1583c9f 100644
--- a/arch/riscv/include/asm/syscall.h
+++ b/arch/riscv/include/asm/syscall.h
@@ -15,7 +15,7 @@
#include <linux/err.h>
/* The array of function pointers for syscalls. */
-extern void *sys_call_table[];
+extern void * const sys_call_table[];
/*
* Only the low 32 bits of orig_r0 are meaningful, so we return int.
diff --git a/arch/riscv/kernel/syscall_table.c b/arch/riscv/kernel/syscall_table.c
index f1ead9df96ca..a63c667c27b3 100644
--- a/arch/riscv/kernel/syscall_table.c
+++ b/arch/riscv/kernel/syscall_table.c
@@ -13,7 +13,7 @@
#undef __SYSCALL
#define __SYSCALL(nr, call) [nr] = (call),
-void *sys_call_table[__NR_syscalls] = {
+void * const sys_call_table[__NR_syscalls] = {
[0 ... __NR_syscalls - 1] = sys_ni_syscall,
#include <asm/unistd.h>
};
--
2.31.0
next prev parent reply other threads:[~2021-03-31 16:32 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-31 16:24 [PATCH v2 0/9] riscv: improve self-protection Jisheng Zhang
2021-03-31 16:25 ` [PATCH v2 1/9] riscv: add __init section marker to some functions Jisheng Zhang
2021-04-02 4:08 ` Anup Patel
2021-04-12 5:37 ` Jisheng Zhang
2021-03-31 16:25 ` [PATCH v2 2/9] riscv: Mark some global variables __ro_after_init Jisheng Zhang
2021-04-02 4:09 ` Anup Patel
2021-03-31 16:26 ` Jisheng Zhang [this message]
2021-04-02 4:11 ` [PATCH v2 3/9] riscv: Constify sys_call_table Anup Patel
2021-03-31 16:26 ` [PATCH v2 4/9] riscv: Constify sbi_ipi_ops Jisheng Zhang
2021-04-02 4:12 ` Anup Patel
2021-03-31 16:27 ` [PATCH v2 5/9] riscv: kprobes: Implement alloc_insn_page() Jisheng Zhang
2021-04-02 4:16 ` Anup Patel
2021-03-31 16:27 ` [PATCH v2 6/9] riscv: bpf: Write protect JIT code Jisheng Zhang
2021-03-31 16:28 ` [PATCH v2 7/9] riscv: bpf: Avoid breaking W^X on RV64 Jisheng Zhang
2021-03-31 16:29 ` [PATCH v2 8/9] riscv: module: Create module allocations without exec permissions Jisheng Zhang
2021-04-02 4:18 ` Anup Patel
2021-03-31 16:29 ` [PATCH v2 9/9] riscv: Set ARCH_HAS_STRICT_MODULE_RWX if MMU Jisheng Zhang
2021-04-02 4:14 ` Anup Patel
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