From: Masami Hiramatsu <mhiramat@kernel.org>
To: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Chen Yu <yu.c.chen@intel.com>, Chen Yu <yu.chen.surf@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>, Jonathan Corbet <corbet@lwn.net>
Subject: Re: [PATCH v4 2/4] tools/bootconfig: Fix to check the write failure correctly
Date: Thu, 19 Nov 2020 14:42:41 +0900 [thread overview]
Message-ID: <20201119144241.6e87b0db19dfd542906d1b60@kernel.org> (raw)
In-Reply-To: <160571373504.277955.1260524414275036851.stgit@devnote2>
On Thu, 19 Nov 2020 00:35:35 +0900
Masami Hiramatsu <mhiramat@kernel.org> wrote:
> Fix to check the write(2) failure including partial write
> correctly and try to rollback the partial write, because
> if there is no BOOTCONFIG_MAGIC string, we can not remove it.
>
> Fixes: 85c46b78da58 ("bootconfig: Add bootconfig magic word for indicating bootconfig explicitly")
> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
> Tested-by: Chen Yu <yu.chen.surf@gmail.com>
> ---
> tools/bootconfig/main.c | 27 +++++++++++++++++++++++----
> 1 file changed, 23 insertions(+), 4 deletions(-)
>
> diff --git a/tools/bootconfig/main.c b/tools/bootconfig/main.c
> index 52eb2bbe8966..905bfaefae35 100644
> --- a/tools/bootconfig/main.c
> +++ b/tools/bootconfig/main.c
> @@ -337,6 +337,7 @@ static int delete_xbc(const char *path)
>
> static int apply_xbc(const char *path, const char *xbc_path)
> {
> + struct stat stat;
> u32 size, csum;
> char *buf, *data;
> int ret, fd;
> @@ -394,16 +395,26 @@ static int apply_xbc(const char *path, const char *xbc_path)
> return ret;
> }
> /* TODO: Ensure the @path is initramfs/initrd image */
> + if (fstat(fd, &stat) < 0) {
> + pr_err("Failed to get the size of %s\n", path);
> + goto out;
> + }
> ret = write(fd, data, size + 8);
> - if (ret < 0) {
> + if (ret < size + 8) {
> + if (ret < 0)
> + ret = -errno;
> pr_err("Failed to apply a boot config: %d\n", ret);
> - goto out;
> + if (ret < 0)
> + goto out;
> + goto out_rollback;
> }
> /* Write a magic word of the bootconfig */
> ret = write(fd, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN);
> - if (ret < 0) {
> + if (ret < BOOTCONFIG_MAGIC_LEN) {
> + if (ret < 0)
> + ret = -errno;
> pr_err("Failed to apply a boot config magic: %d\n", ret);
> - goto out;
> + goto out_rollback;
> }
> ret = 0;
> out:
> @@ -411,6 +422,14 @@ static int apply_xbc(const char *path, const char *xbc_path)
> free(data);
>
> return ret;
> +
> +out_rollback:
Oops, I forgot to set error to return value here.
I'll fix that.
Thank you,
> + if (ftruncate(fd, stat.st_size) < 0) {
> + ret = -errno;
> + pr_err("Failed to rollback the write error: %d\n", ret);
> + pr_err("The initrd %s may be corrupted. Recommend to rebuild.\n", path);
> + }
> + goto out;
> }
>
> static int usage(void)
>
--
Masami Hiramatsu <mhiramat@kernel.org>
next prev parent reply other threads:[~2020-11-19 5:43 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-18 15:35 [PATCH v4 0/4] tools/bootconfig: Align the bootconfig applied initrd Masami Hiramatsu
2020-11-18 15:35 ` [PATCH v4 1/4] tools/bootconfig: Fix errno reference after printf() Masami Hiramatsu
2020-11-18 15:35 ` [PATCH v4 2/4] tools/bootconfig: Fix to check the write failure correctly Masami Hiramatsu
2020-11-18 16:04 ` Steven Rostedt
2020-11-19 1:41 ` Masami Hiramatsu
2020-11-19 13:59 ` Steven Rostedt
2020-11-19 5:42 ` Masami Hiramatsu [this message]
2020-11-18 15:35 ` [PATCH v4 3/4] tools/bootconfig: Align the bootconfig applied initrd image size to 4 Masami Hiramatsu
2020-11-18 16:22 ` Steven Rostedt
2020-11-19 2:32 ` Masami Hiramatsu
2020-11-18 15:35 ` [PATCH v4 4/4] docs: bootconfig: Update file format on initrd image Masami Hiramatsu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201119144241.6e87b0db19dfd542906d1b60@kernel.org \
--to=mhiramat@kernel.org \
--cc=corbet@lwn.net \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=rostedt@goodmis.org \
--cc=torvalds@linux-foundation.org \
--cc=yu.c.chen@intel.com \
--cc=yu.chen.surf@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).