bpf: fs/xattr: Add BPF kfuncs to set and remove xattrs

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Add the following kfuncs to set and remove xattrs from BPF programs:

  bpf_set_dentry_xattr
  bpf_remove_dentry_xattr
  bpf_set_dentry_xattr_locked
  bpf_remove_dentry_xattr_locked

The _locked version of these kfuncs are called from hooks where
dentry->d_inode is already locked. Instead of requiring the user
to know which version of the kfuncs to use, the verifier will pick
the proper kfunc based on the calling hook.

Signed-off-by: Song Liu <song@kernel.org>
Acked-by: Christian Brauner <brauner@kernel.org>
Reviewed-by: Matt Bobrowski <mattbobrowski@google.com>
Link: https://lore.kernel.org/r/20250130213549.3353349-5-song@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Song Liu 2025-01-30 13:35:48 -08:00 • committed by Alexei Starovoitov

parent 7587d735b1

commit 5646729279

3 changed files with 228 additions and 0 deletions

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189

fs/bpf_fs_kfuncs.c

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18

include/linux/bpf_lsm.h

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21

kernel/bpf/verifier.c

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