Hou Tao 23c39b8659 bpf: Add bpf_mem_alloc_check_size() helper ...

[ Upstream commit 62a898b07b ]

Introduce bpf_mem_alloc_check_size() to check whether the allocation
size exceeds the limitation for the kmalloc-equivalent allocator. The
upper limit for percpu allocation is LLIST_NODE_SZ bytes larger than
non-percpu allocation, so a percpu argument is added to the helper.

The helper will be used in the following patch to check whether the size
parameter passed to bpf_mem_alloc() is too big.

Signed-off-by: Hou Tao <houtao1@huawei.com>
Link: https://lore.kernel.org/r/20241030100516.3633640-3-houtao@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Stable-dep-of: 393397fbdc ("bpf: Check the validity of nr_words in bpf_iter_bits_new()")
Signed-off-by: Sasha Levin <sashal@kernel.org>

2024-11-08 16:30:48 +01:00

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