diff options
| author | Christian Brauner <brauner@kernel.org> | 2026-07-21 16:14:01 +0200 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2026-08-03 10:08:47 +0200 |
| commit | 375e8a31a8b069bf0ebf6398815057660fe059b1 (patch) | |
| tree | 9a527d0cf338b47ac7c8cdd25be29d36997d0767 /include/linux/binfmt_misc.h | |
| parent | 83cd3989ba0971693461088d35142ad52d862135 (diff) | |
binfmt_misc: let a bpf handler request loader substitution
Give bpf handlers the per-exec equivalent of the static 'L' flag. A
load program that sets BPF_BINPRM_LOADER has its selected interpreter
substituted for the binary's PT_INTERP instead of run with the binary
as payload. The binary otherwise executes as a fully native exec.
A single handler can now grade its dispatch per binary: native-arch ELF
with PT_INTERP gets loader substitution for full native identity.
Anything else, such as foreign arch, static, non-ELF can use transparent
or classic dispatch. The load program can read the binary's ELF header
from bprm->buf to make that call.
Link: https://patch.msgid.link/20260721-work-bpf-binfmt_misc-ptinterp-v2-19-e57866e4ae0f@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
Diffstat (limited to 'include/linux/binfmt_misc.h')
| -rw-r--r-- | include/linux/binfmt_misc.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/binfmt_misc.h b/include/linux/binfmt_misc.h index 26da749391b4..4abdfd36b3fa 100644 --- a/include/linux/binfmt_misc.h +++ b/include/linux/binfmt_misc.h @@ -19,6 +19,9 @@ struct user_namespace; * @BPF_BINPRM_TRANSPARENT: leave argv untouched, the interpreter takes the * binary from AT_EXECFD (like the 'T' flag); implies * execfd, excludes preserve-argv0 + * @BPF_BINPRM_LOADER: substitute the interpreter for the binary's PT_INTERP + * and run the binary as a native exec (like the 'L' + * flag); excludes every other flag * * Set from a load program with bpf_binprm_set_flags(). Unlike a static entry, * a bpf handler chooses these per exec rather than once at registration. @@ -28,6 +31,7 @@ enum bpf_binprm_flags { BPF_BINPRM_CREDENTIALS = (1ULL << 1), BPF_BINPRM_EXECFD = (1ULL << 2), BPF_BINPRM_TRANSPARENT = (1ULL << 3), + BPF_BINPRM_LOADER = (1ULL << 4), }; /** |