From: Alan Maguire Date: Mon, 28 Sep 2020 11:31:07 +0000 (+0100) Subject: bpf: Bump iter seq size to support BTF representation of large data structures X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=af65320948b848dd1ae65eb4bc3e164c53e741d8;p=linux.git bpf: Bump iter seq size to support BTF representation of large data structures BPF iter size is limited to PAGE_SIZE; if we wish to display BTF-based representations of larger kernel data structures such as task_struct, this will be insufficient. Suggested-by: Alexei Starovoitov Signed-off-by: Alan Maguire Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/1601292670-1616-6-git-send-email-alan.maguire@oracle.com --- diff --git a/kernel/bpf/bpf_iter.c b/kernel/bpf/bpf_iter.c index 30833bbf30195..8f10e30ea0b08 100644 --- a/kernel/bpf/bpf_iter.c +++ b/kernel/bpf/bpf_iter.c @@ -88,8 +88,8 @@ static ssize_t bpf_seq_read(struct file *file, char __user *buf, size_t size, mutex_lock(&seq->lock); if (!seq->buf) { - seq->size = PAGE_SIZE; - seq->buf = kmalloc(seq->size, GFP_KERNEL); + seq->size = PAGE_SIZE << 3; + seq->buf = kvmalloc(seq->size, GFP_KERNEL); if (!seq->buf) { err = -ENOMEM; goto done;