ab6c637ad0
When reviewing local percpu kptr support, Alexei discovered a bug wherea bpf_kptr_xchg() may succeed even if the map value kptr type and locally allocated obj type do not match ([1]). Missed struct btf_id comparison is the reason for the bug. This patch added such struct btf_id comparison and will flag verification failure if types do not match. [1] https://lore.kernel.org/bpf/20230819002907.io3iphmnuk43xblu@macbook-pro-8.dhcp.thefacebook.com/#t Reported-by: Alexei Starovoitov <ast@kernel.org> Fixes: 738c96d5e2e3 ("bpf: Allow local kptrs to be exchanged via bpf_kptr_xchg") Signed-off-by: Yonghong Song <yonghong.song@linux.dev> Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20230822050053.2886960-1-yonghong.song@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.