ipc, msg: Account msg_msg allocations with GFP_KERNEL_ACCOUNT again

Since commit 734bbc1c97ea7 ("ipc, msg: Use dedicated slab buckets for
alloc_msg()"), alloc_msg() allocates with GFP_KERNEL, and a msg_msg is
accounted only through SLAB_ACCOUNT on its bucket caches. With
CONFIG_SLAB_BUCKETS=n, kmem_buckets_create() creates no caches and
kmem_buckets_alloc() is a GFP_KERNEL kmalloc() from the general caches,
which do not account it; the same happens when kmem_buckets_create()
fails. Either way, the allocation is not charged to the sender's memory
cgroup.

Allocate with GFP_KERNEL_ACCOUNT again, as before that commit, so the
allocation is charged whichever cache serves it.

Build tested ARCH=x86_64 defconfig with GCC 16.2.0, with
CONFIG_SLAB_BUCKETS as y and n.

Fixes: 734bbc1c97ea7 ("ipc, msg: Use dedicated slab buckets for alloc_msg()")
Cc: stable@vger.kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>
Link: https://patch.msgid.link/20261014052344.384723-2-kees@kernel.org
Signed-off-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Reviewed-by: Harry Yoo (Meta) <harry@kernel.org>
Reviewed-by: Pedro Falcato <pfalcato@suse.de>
Signed-off-by: Harry Yoo (Meta) <harry@kernel.org>

0 files changed, 0 insertions, 0 deletions