[PATCH v7 bpf-next 5/8] bpf: bump iter seq size to support BTF representation of large data structures
From: Alan Maguire <hidden>
Date: 2020-09-28 11:36:01
Also in:
bpf, linux-kselftest, lkml
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [iterator], the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Yonghong Song, Linus Torvalds
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 <redacted> Signed-off-by: Alan Maguire <redacted> --- kernel/bpf/bpf_iter.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/bpf/bpf_iter.c b/kernel/bpf/bpf_iter.c
index 30833bb..8f10e30 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;
--
1.8.3.1