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SubjectRe: [PATCH 1/2] tools/bootconfig: Align the bootconfig applied initrd image size to 4
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Masami Hiramatsu wrote:
> Align the bootconfig applied initrd image size to 4. To pad the data,
> bootconfig will use space (0x20) in front of the bootconfig data,
> and expands its size and update checksum.
>
> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
> ---
> include/linux/bootconfig.h | 1 +
> tools/bootconfig/main.c | 33 ++++++++++++++++++++++++++++-----
> tools/bootconfig/test-bootconfig.sh | 6 +++++-
> 3 files changed, 34 insertions(+), 6 deletions(-)
>
> diff --git a/include/linux/bootconfig.h b/include/linux/bootconfig.h
> index 9903088891fa..461f621047f3 100644
> --- a/include/linux/bootconfig.h
> +++ b/include/linux/bootconfig.h
> @@ -12,6 +12,7 @@
>
> #define BOOTCONFIG_MAGIC "#BOOTCONFIG\n"
> #define BOOTCONFIG_MAGIC_LEN 12
> +#define BOOTCONFIG_ALIGN 4
>
> /* XBC tree node */
> struct xbc_node {
> diff --git a/tools/bootconfig/main.c b/tools/bootconfig/main.c
> index eb92027817a7..4b48e6a5ad1b 100644
> --- a/tools/bootconfig/main.c
> +++ b/tools/bootconfig/main.c
> @@ -332,11 +332,13 @@ static int delete_xbc(const char *path)
>
> static int apply_xbc(const char *path, const char *xbc_path)
> {
> + const char padbuf[BOOTCONFIG_ALIGN] = { 0 };
> u32 size, csum;
> char *buf, *data;
> int ret, fd;
> const char *msg;
> - int pos;
> + struct stat st;
> + int pos, pad;
>
> ret = load_xbc_file(xbc_path, &buf);
> if (ret < 0) {
> @@ -347,12 +349,10 @@ static int apply_xbc(const char *path, const char *xbc_path)
> csum = checksum((unsigned char *)buf, size);
>
> /* Prepare xbc_path data */
> - data = malloc(size + 8);
> + data = malloc(size);
> if (!data)
> return -ENOMEM;
> strcpy(data, buf);
> - *(u32 *)(data + size) = size;
> - *(u32 *)(data + size + 4) = csum;
>
> /* Check the data format */
> ret = xbc_init(buf, &msg, &pos);
> @@ -387,12 +387,35 @@ static int apply_xbc(const char *path, const char *xbc_path)
> free(data);
> return fd;
> }
> +
> + /* To algin up the total size to BOOTCONFIG_ALIGN, get padding size */
> + ret = fstat(fd, &st);
> + if (ret < 0) {
> + pr_err("Failed to get the stat of %s\n", path);
> + free(data);
> + return ret;
> + }
> + pad = BOOTCONFIG_ALIGN - (st.st_size + size) % BOOTCONFIG_ALIGN;
> +
> /* TODO: Ensure the @path is initramfs/initrd image */
> - ret = write(fd, data, size + 8);
> + ret = write(fd, data, size);
> if (ret < 0) {
> pr_err("Failed to apply a boot config: %d\n", ret);
> goto out;
> }
> +
> + if (pad != BOOTCONFIG_ALIGN) {
> + /* Write padding null characters */
> + ret = write(fd, padbuf, pad);
> + if (ret < 0) {
> + pr_err("Failed to write padding: %d\n", ret);
> + goto out;
> + }
> + size += pad;
> + }
> + ret = write(fd, &size, sizeof(u32));
> + ret = write(fd, &csum, sizeof(u32));
> +
> /* Write a magic word of the bootconfig */
> ret = write(fd, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN);
> if (ret < 0) {
> diff --git a/tools/bootconfig/test-bootconfig.sh b/tools/bootconfig/test-bootconfig.sh
> index d295e406a756..baed891d0ba4 100755
> --- a/tools/bootconfig/test-bootconfig.sh
> +++ b/tools/bootconfig/test-bootconfig.sh
> @@ -9,6 +9,7 @@ else
> TESTDIR=.
> fi
> BOOTCONF=${TESTDIR}/bootconfig
> +ALIGN=4
>
> INITRD=`mktemp ${TESTDIR}/initrd-XXXX`
> TEMPCONF=`mktemp ${TESTDIR}/temp-XXXX.bconf`
> @@ -59,7 +60,10 @@ echo "Show command test"
> xpass $BOOTCONF $INITRD
>
> echo "File size check"
> -xpass test $new_size -eq $(expr $bconf_size + $initrd_size + 9 + 12)
> +total_size=$(expr $bconf_size + $initrd_size + 9 + 12 + $ALIGN - 1 )
> +total_size=$(expr $total_size / $ALIGN)
> +total_size=$(expr $total_size \* $ALIGN)
> +xpass test $new_size -eq $total_size
>
> echo "Apply command repeat test"
> xpass $BOOTCONF -a $TEMPCONF $INITRD
>
Typo in the comment line 391: algin

Woody

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