linux-toradex.git/include/linux/bpf.h, branch v7.0-rc6

bpf: Lose const-ness of map in map_check_btf()

2026-02-27T23:39:00+00:00

BPF hash map may now use the map_check_btf() callback to decide whether
to set a dtor on its bpf_mem_alloc or not. Unlike C++ where members can
opt out of const-ness using mutable, we must lose the const qualifier on
the callback such that we can avoid the ugly cast. Make the change and
adjust all existing users, and lose the comment in hashtab.c.

Signed-off-by: Kumar Kartikeya Dwivedi 
Link: https://lore.kernel.org/r/20260227224806.646888-3-memxor@gmail.com
Signed-off-by: Alexei Starovoitov

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from
scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to
avoid scalar types (which need careful case-by-case checking), and
instead replace kmalloc-family calls that allocate struct or union
object instances:

Single allocations:	kmalloc(sizeof(TYPE), ...)
are replaced with:	kmalloc_obj(TYPE, ...)

Array allocations:	kmalloc_array(COUNT, sizeof(TYPE), ...)
are replaced with:	kmalloc_objs(TYPE, COUNT, ...)

Flex array allocations:	kmalloc(struct_size(PTR, FAM, COUNT), ...)
are replaced with:	kmalloc_flex(*PTR, FAM, COUNT, ...)

(where TYPE may also be *VAR)

The resulting allocations no longer return "void *", instead returning
"TYPE *".

Signed-off-by: Kees Cook

bpf, arm64: Add fsession support

2026-01-31T21:51:04+00:00

Implement fsession support in the arm64 BPF JIT trampoline.

Extend the trampoline stack layout to store function metadata and
session cookies, and pass the appropriate metadata to fentry and
fexit programs. This mirrors the existing x86 behavior and enables
session cookies on arm64.

Acked-by: Puranjay Mohan 
Tested-by: Puranjay Mohan 
Signed-off-by: Leon Hwang 
Link: https://lore.kernel.org/r/20260131144950.16294-3-leon.hwang@linux.dev
Signed-off-by: Alexei Starovoitov

bpf: Allow sleepable programs to use tail calls

2026-01-30T20:17:47+00:00

Allowing sleepable programs to use tail calls.

Making sure we can't mix sleepable and non-sleepable bpf programs
in tail call map (BPF_MAP_TYPE_PROG_ARRAY) and allowing it to be
used in sleepable programs.

Sleepable programs can be preempted and sleep which might bring
new source of race conditions, but both direct and indirect tail
calls should not be affected.

Direct tail calls work by patching direct jump to callee into bpf
caller program, so no problem there. We atomically switch from nop
to jump instruction.

Indirect tail call reads the callee from the map and then jumps to
it. The callee bpf program can't disappear (be released) from the
caller, because it is executed under rcu lock (rcu_read_lock_trace).

Signed-off-by: Jiri Olsa 
Acked-by: Leon Hwang 
Link: https://lore.kernel.org/r/20260130081208.1130204-2-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov

bpf: Add trampoline ip hash table

2026-01-28T19:44:57+00:00

Following changes need to lookup trampoline based on its ip address,
adding hash table for that.

Signed-off-by: Jiri Olsa 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20251230145010.103439-8-jolsa@kernel.org

bpf: Fix tcx/netkit detach permissions when prog fd isn't given

2026-01-28T02:39:58+00:00

This commit fixes a security issue where BPF_PROG_DETACH on tcx or
netkit devices could be executed by any user when no program fd was
provided, bypassing permission checks. The fix adds a capability
check for CAP_NET_ADMIN or CAP_SYS_ADMIN in this case.

Fixes: e420bed02507 ("bpf: Add fd-based tcx multi-prog infra with link support")
Signed-off-by: Guillaume Gonnet 
Link: https://lore.kernel.org/r/20260127160200.10395-1-ggonnet.linux@gmail.com
Signed-off-by: Alexei Starovoitov

bpf: support fsession for bpf_session_cookie

2026-01-25T02:49:36+00:00

Implement session cookie for fsession. The session cookies will be stored
in the stack, and the layout of the stack will look like this:
  return value	-> 8 bytes
  argN		-> 8 bytes
  ...
  arg1		-> 8 bytes
  nr_args	-> 8 bytes
  ip (optional)	-> 8 bytes
  cookie2	-> 8 bytes
  cookie1	-> 8 bytes

The offset of the cookie for the current bpf program, which is in 8-byte
units, is stored in the
"(((u64 *)ctx)[-1] >> BPF_TRAMP_COOKIE_INDEX_SHIFT) & 0xFF". Therefore, we
can get the session cookie with ((u64 *)ctx)[-offset].

Implement and inline the bpf_session_cookie() for the fsession in the
verifier.

Signed-off-by: Menglong Dong 
Link: https://lore.kernel.org/r/20260124062008.8657-6-dongml2@chinatelecom.cn
Signed-off-by: Alexei Starovoitov

bpf: support fsession for bpf_session_is_return

2026-01-25T02:49:36+00:00

If fsession exists, we will use the bit (1 << BPF_TRAMP_IS_RETURN_SHIFT)
in ((u64 *)ctx)[-1] to store the "is_return" flag.

The logic of bpf_session_is_return() for fsession is implemented in the
verifier by inline following code:

  bool bpf_session_is_return(void *ctx)
  {
      return (((u64 *)ctx)[-1] >> BPF_TRAMP_IS_RETURN_SHIFT) & 1;
  }

Signed-off-by: Menglong Dong 
Co-developed-by: Leon Hwang 
Signed-off-by: Leon Hwang 
Link: https://lore.kernel.org/r/20260124062008.8657-5-dongml2@chinatelecom.cn
Signed-off-by: Alexei Starovoitov

bpf: add fsession support

2026-01-25T02:49:35+00:00

The fsession is something that similar to kprobe session. It allow to
attach a single BPF program to both the entry and the exit of the target
functions.

Introduce the struct bpf_fsession_link, which allows to add the link to
both the fentry and fexit progs_hlist of the trampoline.

Signed-off-by: Menglong Dong 
Co-developed-by: Leon Hwang 
Signed-off-by: Leon Hwang 
Link: https://lore.kernel.org/r/20260124062008.8657-2-dongml2@chinatelecom.cn
Signed-off-by: Alexei Starovoitov

bpf: Add BPF_F_CPU and BPF_F_ALL_CPUS flags support for percpu_cgroup_storage maps

2026-01-07T04:48:32+00:00

Introduce BPF_F_ALL_CPUS flag support for percpu_cgroup_storage maps to
allow updating values for all CPUs with a single value for update_elem
API.

Introduce BPF_F_CPU flag support for percpu_cgroup_storage maps to
allow:

* update value for specified CPU for update_elem API.
* lookup value for specified CPU for lookup_elem API.

The BPF_F_CPU flag is passed via map_flags along with embedded cpu info.

Signed-off-by: Leon Hwang 
Link: https://lore.kernel.org/r/20260107022022.12843-6-leon.hwang@linux.dev
Signed-off-by: Alexei Starovoitov