This is a note to let you know that I've just added the patch titled bpf: Add oversize check before call kvcalloc() to the 5.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: bpf-add-oversize-check-before-call-kvcalloc.patch and it can be found in the queue-5.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 0e6491b559704da720f6da09dd0a52c4df44c514 Mon Sep 17 00:00:00 2001 From: Bixuan Cui <cuibixuan@xxxxxxxxxx> Date: Sat, 11 Sep 2021 08:55:57 +0800 Subject: bpf: Add oversize check before call kvcalloc() From: Bixuan Cui <cuibixuan@xxxxxxxxxx> commit 0e6491b559704da720f6da09dd0a52c4df44c514 upstream. Commit 7661809d493b ("mm: don't allow oversized kvmalloc() calls") add the oversize check. When the allocation is larger than what kmalloc() supports, the following warning triggered: WARNING: CPU: 0 PID: 8408 at mm/util.c:597 kvmalloc_node+0x108/0x110 mm/util.c:597 Modules linked in: CPU: 0 PID: 8408 Comm: syz-executor221 Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kvmalloc_node+0x108/0x110 mm/util.c:597 Call Trace: kvmalloc include/linux/mm.h:806 [inline] kvmalloc_array include/linux/mm.h:824 [inline] kvcalloc include/linux/mm.h:829 [inline] check_btf_line kernel/bpf/verifier.c:9925 [inline] check_btf_info kernel/bpf/verifier.c:10049 [inline] bpf_check+0xd634/0x150d0 kernel/bpf/verifier.c:13759 bpf_prog_load kernel/bpf/syscall.c:2301 [inline] __sys_bpf+0x11181/0x126e0 kernel/bpf/syscall.c:4587 __do_sys_bpf kernel/bpf/syscall.c:4691 [inline] __se_sys_bpf kernel/bpf/syscall.c:4689 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4689 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported-by: syzbot+f3e749d4c662818ae439@xxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Bixuan Cui <cuibixuan@xxxxxxxxxx> Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx> Acked-by: Yonghong Song <yhs@xxxxxx> Link: https://lore.kernel.org/bpf/20210911005557.45518-1-cuibixuan@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- kernel/bpf/verifier.c | 2 ++ 1 file changed, 2 insertions(+) --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -10211,6 +10211,8 @@ static int propagate_liveness_reg(struct /* Or if the read flag from REG is the same as PARENT_REG. */ parent_flag == flag) return 0; + if (nr_linfo > INT_MAX / sizeof(struct bpf_line_info)) + return -EINVAL; err = mark_reg_read(env, reg, parent_reg, flag); if (err) Patches currently in stable-queue which might be from cuibixuan@xxxxxxxxxx are queue-5.14/bpf-add-oversize-check-before-call-kvcalloc.patch