Commit ee1afbc1 authored by Nikita Panov's avatar Nikita Panov Committed by Denis Darvish
Browse files

arm64: bpf arch text poke support 

kunpeng inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IBOJU2



-------------------------------------------------

Acked-by: default avatarArtem Kuzin <artem.kuzin@huawei.com>
Acked-by: default avatarAlexander Grubnikov <alexander.grubnikov@huawei.com>
Acked-by: default avatarIlya Hanov <ilya.hanov@huawei-partners.com>
Acked-by: default avatarDenis Darvish <darvish.denis@huawei.com>
Signed-off-by: default avatarNikita Panov <panov.nikita@huawei.com>
parent e88e7781

arch/arm64/net/bpf_jit_comp.c

+2 −2
Original line number Diff line number Diff line
@@ -2251,10 +2251,10 @@ int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type poke_type, 
		/* non-zero plt_target indicates we're patching a bpf prog,

		 * which is read only.

		 */

		if (set_memory_rw(PAGE_MASK & ((uintptr_t)&plt->target), 1))

		if (numa_set_memory_rw(PAGE_MASK & ((uintptr_t)&plt->target), 1))

			return -EFAULT;

		WRITE_ONCE(plt->target, plt_target);

		set_memory_ro(PAGE_MASK & ((uintptr_t)&plt->target), 1);

		numa_set_memory_ro(PAGE_MASK & ((uintptr_t)&plt->target), 1);

		/* since plt target points to either the new trampoline

		 * or dummy_tramp, even if another CPU reads the old plt

		 * target value before fetching the bl instruction to plt,