[PATCH v7 bpf-next 5/8] bpf: bump iter seq size to support BTF representation of large data structures

[Alan Maguire <alan.maguire@xxxxxxxxxx>]

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 <alexei.starovoitov@xxxxxxxxx>
Signed-off-by: Alan Maguire <alan.maguire@xxxxxxxxxx>
---
 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