From d0b80a9edb1a029ff913e81b47540e57ad034329 Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Tue, 26 Jul 2022 14:36:05 -0700 Subject: [PATCH] netdevsim: Avoid allocation warnings triggered from user space We need to suppress warnings from sily map sizes. Also switch from GFP_USER to GFP_KERNEL_ACCOUNT, I'm pretty sure I misunderstood the flags when writing this code. Fixes: 395cacb5f1a0 ("netdevsim: bpf: support fake map offload") Reported-by: syzbot+ad24705d3fd6463b18c6@syzkaller.appspotmail.com Signed-off-by: Jakub Kicinski Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20220726213605.154204-1-kuba@kernel.org --- drivers/net/netdevsim/bpf.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/net/netdevsim/bpf.c b/drivers/net/netdevsim/bpf.c index a438202..5085426 100644 --- a/drivers/net/netdevsim/bpf.c +++ b/drivers/net/netdevsim/bpf.c @@ -351,10 +351,12 @@ nsim_map_alloc_elem(struct bpf_offloaded_map *offmap, unsigned int idx) { struct nsim_bpf_bound_map *nmap = offmap->dev_priv; - nmap->entry[idx].key = kmalloc(offmap->map.key_size, GFP_USER); + nmap->entry[idx].key = kmalloc(offmap->map.key_size, + GFP_KERNEL_ACCOUNT | __GFP_NOWARN); if (!nmap->entry[idx].key) return -ENOMEM; - nmap->entry[idx].value = kmalloc(offmap->map.value_size, GFP_USER); + nmap->entry[idx].value = kmalloc(offmap->map.value_size, + GFP_KERNEL_ACCOUNT | __GFP_NOWARN); if (!nmap->entry[idx].value) { kfree(nmap->entry[idx].key); nmap->entry[idx].key = NULL; @@ -496,7 +498,7 @@ nsim_bpf_map_alloc(struct netdevsim *ns, struct bpf_offloaded_map *offmap) if (offmap->map.map_flags) return -EINVAL; - nmap = kzalloc(sizeof(*nmap), GFP_USER); + nmap = kzalloc(sizeof(*nmap), GFP_KERNEL_ACCOUNT); if (!nmap) return -ENOMEM; -- 2.7.4