exec: stash bpf-selected interpreter state in struct linux_binprm

The upcoming bpf-backed binfmt_misc handlers decide how a binary is run
programmatically at exec time: the interpreter itself, an optional
single argument to pass to it, and the invocation flags that a static
binfmt_misc entry fixes at registration time. The selection runs before
load_misc_binary() has copied the binary path from bprm->interp into
the argument vector, so the selecting program cannot go through
bprm_change_interp() directly without clobbering argv[1].

Stage the selected state in the bprm instead, grouped in struct
binfmt_misc_bpf and embedded anonymously in struct linux_binprm so the
bprm->bpf_* accesses stay direct. The bprm is exclusively owned by the
task doing the exec so no synchronization is needed. The consumers
free and clear the fields once the exec attempt that set them is
finished; free_bprm() covers all error paths.

Link: https://patch.msgid.link/20260714-work-bpf-binfmt_misc-v2-1-57b7529c002c@kernel.org
Reviewed-by: Farid Zakaria <farid.m.zakaria@gmail.com>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

0 files changed, 0 insertions, 0 deletions