[PATCH v4 08/11] seq_buf: Add seq_buf_init_append()

[sashiko-bot at kernel.org]

> From: Bill Wendling <morbo at google.com>
> 
> Several strlcat() call sites being converted to seq_buf need behavior
> seq_buf doesn't currently provide. The normal seq_buf_init() always
> sets the new buffer size to 0 via seq_buf_clear(). Code migrating from
> strlcat(buf, ...), which appends to whatever buf already contains,
> can't use seq_buf_init() without discarding that existing content. Add
> seq_buf_init_append(), which preserves the existing contents and positions
> the seq_buf to append after it. A buffer with no NUL within its size
> starts out overflowed, as strlcat() treats it as already truncated.
> Add KUnit tests for behavior coverage.
> 
> Tests passed under qemu on ARCH=x86_64 with GCC 16.2.0 and CONFIG_KASAN=y,
> and on big-endian ARCH=s390 with GCC s390x-linux-gnu 16.2.0.
> 
> Assisted-by: LLM
> Signed-off-by: Bill Wendling <morbo at google.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
> Co-developed-by: Kees Cook <kees at kernel.org>
> Signed-off-by: Kees Cook <kees at kernel.org>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20261003035906.too.263-kees@kernel.org?part=8