From patchwork Tue Oct 24 22:45:55 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Song Liu X-Patchwork-Id: 13435323 X-Patchwork-Delegate: bpf@iogearbox.net Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9D5402D633 for ; Tue, 24 Oct 2023 22:46:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Q+A5h1GK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 19094C433C8; Tue, 24 Oct 2023 22:46:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1698187601; bh=SedfupLqqwxGyXFp7UnoHlJjoy6qJJmzJtxnfjFyk/A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Q+A5h1GKfRV/kn0pnW3i467kIOPGBONIw5EKIy5ZVrXbmAVKB2OIgs3W+bgr/oiqE wtQ1+zqbeyQizcNK7FQfJgVNdpljWRJ5rnyaRNtHWzs3UVcG6/JUM4FFcV7aGw5NoA RcmiQO49l0L7+ToRWmQl9hVX7Y1gV4Gk9H/K5K2HmpsUGSeTWTARQunXqtPnUPbedn EfmhfgFCUJjdzQSi78TPmBIUzLKAucmcfXvr7e1v7FcT/VAcP7cZEVLVpLKHl9G3UP 2CRNzwu6xitGCUFKyjnlNeyjSDyszSBi7pyD+p7avhXRnmk6xfQ4KFQYvV64+w7LA9 mjrqVkf9rPMjg== From: Song Liu To: bpf@vger.kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@kernel.org, kernel-team@meta.com, bjorn@kernel.org, xukuohai@huawei.com, pulehui@huawei.com, iii@linux.ibm.com, jolsa@kernel.org, Song Liu , =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= Subject: [PATCH v5 bpf-next 1/7] bpf: Let bpf_prog_pack_free handle any pointer Date: Tue, 24 Oct 2023 15:45:55 -0700 Message-Id: <20231024224601.2292927-2-song@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231024224601.2292927-1-song@kernel.org> References: <20231024224601.2292927-1-song@kernel.org> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: bpf@iogearbox.net Currently, bpf_prog_pack_free only can only free pointer to struct bpf_binary_header, which is not flexible. Add a size argument to bpf_prog_pack_free so that it can handle any pointer. Signed-off-by: Song Liu Acked-by: Ilya Leoshkevich Tested-by: Ilya Leoshkevich # on s390x Reviewed-by: Björn Töpel --- include/linux/filter.h | 2 +- kernel/bpf/core.c | 21 ++++++++++----------- kernel/bpf/dispatcher.c | 5 +---- 3 files changed, 12 insertions(+), 16 deletions(-) diff --git a/include/linux/filter.h b/include/linux/filter.h index a4953fafc8cb..68fb6c8142fe 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -1067,7 +1067,7 @@ struct bpf_binary_header * bpf_jit_binary_pack_hdr(const struct bpf_prog *fp); void *bpf_prog_pack_alloc(u32 size, bpf_jit_fill_hole_t bpf_fill_ill_insns); -void bpf_prog_pack_free(struct bpf_binary_header *hdr); +void bpf_prog_pack_free(void *ptr, u32 size); static inline bool bpf_prog_kallsyms_verify_off(const struct bpf_prog *fp) { diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c index 08626b519ce2..fcdf710e6a32 100644 --- a/kernel/bpf/core.c +++ b/kernel/bpf/core.c @@ -928,20 +928,20 @@ void *bpf_prog_pack_alloc(u32 size, bpf_jit_fill_hole_t bpf_fill_ill_insns) return ptr; } -void bpf_prog_pack_free(struct bpf_binary_header *hdr) +void bpf_prog_pack_free(void *ptr, u32 size) { struct bpf_prog_pack *pack = NULL, *tmp; unsigned int nbits; unsigned long pos; mutex_lock(&pack_mutex); - if (hdr->size > BPF_PROG_PACK_SIZE) { - bpf_jit_free_exec(hdr); + if (size > BPF_PROG_PACK_SIZE) { + bpf_jit_free_exec(ptr); goto out; } list_for_each_entry(tmp, &pack_list, list) { - if ((void *)hdr >= tmp->ptr && (tmp->ptr + BPF_PROG_PACK_SIZE) > (void *)hdr) { + if (ptr >= tmp->ptr && (tmp->ptr + BPF_PROG_PACK_SIZE) > ptr) { pack = tmp; break; } @@ -950,10 +950,10 @@ void bpf_prog_pack_free(struct bpf_binary_header *hdr) if (WARN_ONCE(!pack, "bpf_prog_pack bug\n")) goto out; - nbits = BPF_PROG_SIZE_TO_NBITS(hdr->size); - pos = ((unsigned long)hdr - (unsigned long)pack->ptr) >> BPF_PROG_CHUNK_SHIFT; + nbits = BPF_PROG_SIZE_TO_NBITS(size); + pos = ((unsigned long)ptr - (unsigned long)pack->ptr) >> BPF_PROG_CHUNK_SHIFT; - WARN_ONCE(bpf_arch_text_invalidate(hdr, hdr->size), + WARN_ONCE(bpf_arch_text_invalidate(ptr, size), "bpf_prog_pack bug: missing bpf_arch_text_invalidate?\n"); bitmap_clear(pack->bitmap, pos, nbits); @@ -1100,8 +1100,7 @@ bpf_jit_binary_pack_alloc(unsigned int proglen, u8 **image_ptr, *rw_header = kvmalloc(size, GFP_KERNEL); if (!*rw_header) { - bpf_arch_text_copy(&ro_header->size, &size, sizeof(size)); - bpf_prog_pack_free(ro_header); + bpf_prog_pack_free(ro_header, size); bpf_jit_uncharge_modmem(size); return NULL; } @@ -1132,7 +1131,7 @@ int bpf_jit_binary_pack_finalize(struct bpf_prog *prog, kvfree(rw_header); if (IS_ERR(ptr)) { - bpf_prog_pack_free(ro_header); + bpf_prog_pack_free(ro_header, ro_header->size); return PTR_ERR(ptr); } return 0; @@ -1153,7 +1152,7 @@ void bpf_jit_binary_pack_free(struct bpf_binary_header *ro_header, { u32 size = ro_header->size; - bpf_prog_pack_free(ro_header); + bpf_prog_pack_free(ro_header, size); kvfree(rw_header); bpf_jit_uncharge_modmem(size); } diff --git a/kernel/bpf/dispatcher.c b/kernel/bpf/dispatcher.c index fa3e9225aedc..56760fc10e78 100644 --- a/kernel/bpf/dispatcher.c +++ b/kernel/bpf/dispatcher.c @@ -150,10 +150,7 @@ void bpf_dispatcher_change_prog(struct bpf_dispatcher *d, struct bpf_prog *from, goto out; d->rw_image = bpf_jit_alloc_exec(PAGE_SIZE); if (!d->rw_image) { - u32 size = PAGE_SIZE; - - bpf_arch_text_copy(d->image, &size, sizeof(size)); - bpf_prog_pack_free((struct bpf_binary_header *)d->image); + bpf_prog_pack_free(d->image, PAGE_SIZE); d->image = NULL; goto out; }