kheaders: Use array declaration instead of char

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: kheaders: Use array declaration instead of char Under CONFIG_FORTIFY_SOURCE, memcpy() will check the size of destination and source buffers. Defining kernel_headers_data as "char" would trip this check. Since these addresses are treated as byte arrays, define them as arrays (as done everywhere else). This was seen with: $ cat /sys/kernel/kheaders.tar.xz >> /dev/null detected buffer overflow in memcpy kernel BUG at lib/string_helpers.c:1027! ... RIP: 0010:fortify_panic+0xf/0x20 [...] Call Trace: <TASK> ikheaders_read+0x45/0x50 [kheaders] kernfs_fop_read_iter+0x1a4/0x2f0 ...

References

• https://git.kernel.org/stable/c/719459877d58c8aced5845c1e5b98d8d87d09197
• https://git.kernel.org/stable/c/fcd2da2e6bf2640a31a2a5b118b50dc3635c707b
• https://git.kernel.org/stable/c/4a07d2d511e2703efd4387891d49e0326f1157f3
• https://git.kernel.org/stable/c/b9f6845a492de20679b84bda6b08be347c5819da
• https://git.kernel.org/stable/c/d6d1af6b8611801b585c53c0cc63626c8d339e96
• https://git.kernel.org/stable/c/82d2e01b95c439fe55fab5e04fc83387c42d3a48
• https://git.kernel.org/stable/c/b69edab47f1da8edd8e7bfdf8c70f51a2a5d89fb