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selftests/bpf: Use the last page in test_snprintf_btf on s390

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commit 42a382a466a967dc053c73b969cd2ac2fec502cf upstream.

test_snprintf_btf fails on s390, because NULL points to a readable
struct lowcore there. Fix by using the last page instead.

Error message example:

    printing fffffffffffff000 should generate error, got (361)

Fixes: 076a95f5af ("selftests/bpf: Add bpf_snprintf_btf helper tests")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210227051726.121256-1-iii@linux.ibm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ilya Leoshkevich 2021-02-27 06:17:26 +01:00 committed by Greg Kroah-Hartman
parent 6aa2382994
commit 7653656be2
1 changed files with 10 additions and 3 deletions
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13
tools/testing/selftests/bpf/progs/netif_receive_skb.c
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@ -16,6 +16,13 @@ bool skip = false;
#define STRSIZE 2048
#define EXPECTED_STRSIZE 256
#if defined(bpf_target_s390)
/* NULL points to a readable struct lowcore on s390, so take the last page */
#define BADPTR ((void *)0xFFFFFFFFFFFFF000ULL)
#else
#define BADPTR 0
#endif
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#endif
@ -113,11 +120,11 @@ int BPF_PROG(trace_netif_receive_skb, struct sk_buff *skb)
}
/* Check invalid ptr value */
p.ptr = 0;
p.ptr = BADPTR;
__ret = bpf_snprintf_btf(str, STRSIZE, &p, sizeof(p), 0);
if (__ret >= 0) {
bpf_printk("printing NULL should generate error, got (%d)",
__ret);
bpf_printk("printing %llx should generate error, got (%d)",
(unsigned long long)BADPTR, __ret);
ret = -ERANGE;
}