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From:   He Zhe <zhe.he@windriver.com>
To:     linux@armlinux.org.uk, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, zhe.he@windriver.com
Subject: [PATCH] ARM: uaccess: Disable KASAN for uaccess_with_memcpy.c
Date:   Mon, 11 Jul 2022 17:48:59 +0800
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uaccess_with_memcpy.c accesses user-space address on purpose. We should
disable KASAN instrumentation for it, otherwise we would have call traces
like the following.

BUG: KASAN: user-memory-access in __clear_user_memset+0x154/0x21c
Write of size 4032 at addr 00501040 by task init/1

CPU: 1 PID: 1 Comm: init Not tainted 5.15.52-yocto-standard #1
Hardware name: Xilinx Zynq Platform
[<80116be8>] (unwind_backtrace) from [<8010ea3c>] (show_stack+0x18/0x1c)
[<8010ea3c>] (show_stack) from [<80fc287c>] (dump_stack_lvl+0x40/0x4c)
[<80fc287c>] (dump_stack_lvl) from [<80391148>] (kasan_report+0x19c/0x1cc)
[<80391148>] (kasan_report) from [<80391b78>] (kasan_check_range+0x20/0x174)
[<80391b78>] (kasan_check_range) from [<8039230c>] (memset+0x20/0x3c)
[<8039230c>] (memset) from [<808112f0>] (__clear_user_memset+0x154/0x21c)
[<808112f0>] (__clear_user_memset) from [<8044a9d4>] (clear_user+0x44/0x5c)
[<8044a9d4>] (clear_user) from [<8044aa0c>] (padzero+0x20/0x38)
[<8044aa0c>] (padzero) from [<8044ca00>] (load_elf_binary+0x994/0x1740)
[<8044ca00>] (load_elf_binary) from [<803b4ed0>] (bprm_execve+0x420/0x8ec)
[<803b4ed0>] (bprm_execve) from [<803b5bc0>] (kernel_execve+0x15c/0x190)
[<803b5bc0>] (kernel_execve) from [<80fb9bf0>] (try_to_run_init_process+0x14/0x40)
[<80fb9bf0>] (try_to_run_init_process) from [<80fccd3c>] (kernel_init+0xc8/0x148)
[<80fccd3c>] (kernel_init) from [<80100130>] (ret_from_fork+0x14/0x24)

Signed-off-by: He Zhe <zhe.he@windriver.com>
---
 arch/arm/lib/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index 6d2ba454f25b..ddeb46efed80 100644
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile
@@ -27,6 +27,7 @@ endif
 
 # using lib_ here won't override already available weak symbols
 obj-$(CONFIG_UACCESS_WITH_MEMCPY) += uaccess_with_memcpy.o
+KASAN_SANITIZE_uaccess_with_memcpy.o := n
 
 lib-$(CONFIG_MMU) += $(mmu-y)
 
-- 
2.17.1