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SubjectRe: [PATCH net-next v6 01/11] bpf: Add eBPF program subtype and is_valid_subtype() verifier
Hi Mickaël,

[auto build test WARNING on net-next/master]

url: https://github.com/0day-ci/linux/commits/Micka-l-Sala-n/Landlock-LSM-Toward-unprivileged-sandboxing/20170329-211258
config: i386-randconfig-x002-201713 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

All warnings (new ones prefixed by >>):

kernel/bpf/syscall.c: In function 'bpf_prog_load':
>> kernel/bpf/syscall.c:886:25: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
size = check_user_buf((void __user *)attr->prog_subtype,
^

vim +886 kernel/bpf/syscall.c

870
871 prog->orig_prog = NULL;
872 prog->jited = 0;
873
874 atomic_set(&prog->aux->refcnt, 1);
875 prog->gpl_compatible = is_gpl ? 1 : 0;
876
877 /* find program type: socket_filter vs tracing_filter */
878 err = find_prog_type(type, prog);
879 if (err < 0)
880 goto free_prog;
881
882 /* copy eBPF program subtype from user space */
883 if (attr->prog_subtype) {
884 __u32 size;
885
> 886 size = check_user_buf((void __user *)attr->prog_subtype,
887 attr->prog_subtype_size,
888 sizeof(prog->subtype));
889 if (size < 0) {
890 err = size;
891 goto free_prog;
892 }
893 /* prog->subtype is __GFP_ZERO */
894 if (copy_from_user(&prog->subtype,

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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