linux-kernel - [PATCH 5.18 4/6] hinic: Replace memcpy() with direct assignment

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Date:   Thu, 30 Jun 2022 15:47:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, llvm@...ts.linux.dev,
        Kees Cook <keescook@...omium.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH 5.18 4/6] hinic: Replace memcpy() with direct assignment

From: Kees Cook <keescook@...omium.org>

commit 1e70212e031528918066a631c9fdccda93a1ffaa upstream.

Under CONFIG_FORTIFY_SOURCE=y and CONFIG_UBSAN_BOUNDS=y, Clang is bugged
here for calculating the size of the destination buffer (0x10 instead of
0x14). This copy is a fixed size (sizeof(struct fw_section_info_st)), with
the source and dest being struct fw_section_info_st, so the memcpy should
be safe, assuming the index is within bounds, which is UBSAN_BOUNDS's
responsibility to figure out.

Avoid the whole thing and just do a direct assignment. This results in
no change to the executable code.

[This is a duplicate of commit 2c0ab32b73cf ("hinic: Replace memcpy()
 with direct assignment") which was applied to net-next.]

Cc: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: Tom Rix <trix@...hat.com>
Cc: llvm@...ts.linux.dev
Link: https://github.com/ClangBuiltLinux/linux/issues/1592
Signed-off-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>
Tested-by: Nathan Chancellor <nathan@...nel.org> # build
Link: https://lore.kernel.org/r/20220616052312.292861-1-keescook@chromium.org
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/huawei/hinic/hinic_devlink.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/drivers/net/ethernet/huawei/hinic/hinic_devlink.c
+++ b/drivers/net/ethernet/huawei/hinic/hinic_devlink.c
@@ -43,9 +43,7 @@ static bool check_image_valid(struct hin
 
 	for (i = 0; i < fw_image->fw_info.fw_section_cnt; i++) {
 		len += fw_image->fw_section_info[i].fw_section_len;
-		memcpy(&host_image->image_section_info[i],
-		       &fw_image->fw_section_info[i],
-		       sizeof(struct fw_section_info_st));
+		host_image->image_section_info[i] = fw_image->fw_section_info[i];
 	}
 
 	if (len != fw_image->fw_len ||