lkml.org 
[lkml]   [2021]   [Dec]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v3] module: add in-kernel support for decompressing
On Thu, Dec 09, 2021 at 10:09:17PM -0800, Dmitry Torokhov wrote:
> +static ssize_t module_xz_decompress(struct load_info *info,
> + const void *buf, size_t size)
> +{
> + static const u8 signature[] = { 0xfd, '7', 'z', 'X', 'Z', 0 };
> + struct xz_dec *xz_dec;
> + struct xz_buf xz_buf;
> + enum xz_ret xz_ret;
> + size_t new_size = 0;
> + ssize_t retval;
> +
> + if (size < sizeof(signature) ||
> + memcmp(buf, signature, sizeof(signature))) {
> + pr_err("not an xz compressed module\n");
> + return -EINVAL;
> + }
> +
> + xz_dec = xz_dec_init(XZ_DYNALLOC, (u32)-1);
> + if (!xz_dec)
> + return -ENOMEM;
> +
> + xz_buf.in_size = size;
> + xz_buf.in = buf;
> + xz_buf.in_pos = 0;
> +
> + do {
> + struct page *page = module_get_next_page(info);
> + if (!page) {
> + retval = -ENOMEM;
> + goto out;
> + }

This looks very similar to fw_decompress_xz_pages() on
drivers/base/firmware_loader/main.c

Is there any sharing possible with decompression between the two?

Luis

\
 
 \ /
  Last update: 2021-12-10 23:06    [W:0.066 / U:0.176 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site