Messages in this thread Patch in this message | | | From | Masami Hiramatsu <> | Subject | [PATCH v4 2/4] tools/bootconfig: Fix to check the write failure correctly | Date | Thu, 19 Nov 2020 00:35:35 +0900 |
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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: + 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)
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