linux-toradex.git/kernel/user_namespace.c, branch v7.0-rc5

Convert remaining multi-line kmalloc_obj/flex GFP_KERNEL uses

2026-02-22T16:26:33+00:00

Conversion performed via this Coccinelle script:

  // SPDX-License-Identifier: GPL-2.0-only
  // Options: --include-headers-for-types --all-includes --include-headers --keep-comments
  virtual patch

  @gfp depends on patch && !(file in "tools") && !(file in "samples")@
  identifier ALLOC = {kmalloc_obj,kmalloc_objs,kmalloc_flex,
 		    kzalloc_obj,kzalloc_objs,kzalloc_flex,
		    kvmalloc_obj,kvmalloc_objs,kvmalloc_flex,
		    kvzalloc_obj,kvzalloc_objs,kvzalloc_flex};
  @@

  	ALLOC(...
  -		, GFP_KERNEL
  	)

  $ make coccicheck MODE=patch COCCI=gfp.cocci

Build and boot tested x86_64 with Fedora 42's GCC and Clang:

Linux version 6.19.0+ (user@host) (gcc (GCC) 15.2.1 20260123 (Red Hat 15.2.1-7), GNU ld version 2.44-12.fc42) #1 SMP PREEMPT_DYNAMIC 1970-01-01
Linux version 6.19.0+ (user@host) (clang version 20.1.8 (Fedora 20.1.8-4.fc42), LLD 20.1.8) #1 SMP PREEMPT_DYNAMIC 1970-01-01

Signed-off-by: Kees Cook 
Signed-off-by: Linus Torvalds

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

ns: move ns type into struct ns_common

2025-09-25T07:23:54+00:00

It's misplaced in struct proc_ns_operations and ns->ops might be NULL if
the namespace is compiled out but we still want to know the type of the
namespace for the initial namespace struct.

Reviewed-by: Jan Kara 
Signed-off-by: Christian Brauner

ns: simplify ns_common_init() further

2025-09-22T12:47:10+00:00

Simply derive the ns operations from the namespace type.

Acked-by: Thomas Gleixner 
Reviewed-by: Jan Kara 
Signed-off-by: Christian Brauner

user: port to ns_ref_*() helpers

2025-09-19T14:22:37+00:00

Stop accessing ns.count directly.

Reviewed-by: Jan Kara 
Signed-off-by: Christian Brauner

ns: add ns_common_free()

2025-09-19T14:22:36+00:00

And drop ns_free_inum(). Anything common that can be wasted centrally
should be wasted in the new common helper.

Reviewed-by: Jan Kara 
Signed-off-by: Christian Brauner

nscommon: simplify initialization

2025-09-19T12:26:19+00:00

There's a lot of information that namespace implementers don't need to
know about at all. Encapsulate this all in the initialization helper.

Reviewed-by: Jan Kara 
Signed-off-by: Christian Brauner

ns: add to__ns() to respective headers

2025-09-19T12:26:16+00:00

Every namespace type has a container_of(ns, , ns) static inline
function that is currently not exposed in the header. So we have a bunch
of places that open-code it via container_of(). Move it to the headers
so we can use it directly.

Reviewed-by: Aleksa Sarai 
Signed-off-by: Christian Brauner

user: support ns lookup

2025-09-19T12:26:15+00:00

Support the generic ns lookup infrastructure to support file handles for
namespaces.

Signed-off-by: Christian Brauner

user: use ns_common_init()

2025-09-19T12:26:13+00:00

Don't cargo-cult the same thing over and over.

Reviewed-by: Jan Kara 
Signed-off-by: Christian Brauner