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6685aadcab
Song Liu says:
====================
bpf: File verification with LSM and fsverity
Changes v14 => v15:
1. Fix selftest build without CONFIG_FS_VERITY. (Alexei)
2. Add Acked-by from KP.
Changes v13 => v14:
1. Add "static" for bpf_fs_kfunc_set.
2. Add Acked-by from Christian Brauner.
Changes v12 => v13:
1. Only keep 4/9 through 9/9 of v12, as the first 3 patches already
applied;
2. Use new macro __bpf_kfunc_[start|end]_defs().
Changes v11 => v12:
1. Fix typo (data_ptr => sig_ptr) in bpf_get_file_xattr().
Changes v10 => v11:
1. Let __bpf_dynptr_data() return const void *. (Andrii)
2. Optimize code to reuse output from __bpf_dynptr_size(). (Andrii)
3. Add __diag_ignore_all("-Wmissing-declarations") for kfunc definition.
4. Fix an off indentation. (Andrii)
Changes v9 => v10:
1. Remove WARN_ON_ONCE() from check_reg_const_str. (Alexei)
Changes v8 => v9:
1. Fix test_progs kfunc_dynptr_param/dynptr_data_null.
Changes v7 => v8:
1. Do not use bpf_dynptr_slice* in the kernel. Add __bpf_dynptr_data* and
use them in ther kernel. (Andrii)
Changes v6 => v7:
1. Change "__const_str" annotation to "__str". (Alexei, Andrii)
2. Add KF_TRUSTED_ARGS flag for both new kfuncs. (KP)
3. Only allow bpf_get_file_xattr() to read xattr with "user." prefix.
4. Add Acked-by from Eric Biggers.
Changes v5 => v6:
1. Let fsverity_init_bpf() return void. (Eric Biggers)
2. Sort things in alphabetic orders. (Eric Biggers)
Changes v4 => v5:
1. Revise commit logs. (Alexei)
Changes v3 => v4:
1. Fix error reported by CI.
2. Update comments of bpf_dynptr_slice* that they may return error pointer.
Changes v2 => v3:
1. Rebase and resolve conflicts.
Changes v1 => v2:
1. Let bpf_get_file_xattr() use const string for arg "name". (Alexei)
2. Add recursion prevention with allowlist. (Alexei)
3. Let bpf_get_file_xattr() use __vfs_getxattr() to avoid recursion,
as vfs_getxattr() calls into other LSM hooks.
4. Do not use dynptr->data directly, use helper insteadd. (Andrii)
5. Fixes with bpf_get_fsverity_digest. (Eric Biggers)
6. Add documentation. (Eric Biggers)
7. Fix some compile warnings. (kernel test robot)
This set enables file verification with BPF LSM and fsverity.
In this solution, fsverity is used to provide reliable and efficient hash
of files; and BPF LSM is used to implement signature verification (against
asymmetric keys), and to enforce access control.
This solution can be used to implement access control in complicated cases.
For example: only signed python binary and signed python script and access
special files/devices/ports.
Thanks,
Song
====================
Link: https://lore.kernel.org/r/20231129234417.856536-1-song@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
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Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
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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.