diff mbox series

[bpf-next,v2,3/4] libbpf: Fix dumping non-aligned __int128

Message ID 20211013160902.428340-4-iii@linux.ibm.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series btf_dump fixes for s390 | expand

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bpf/vmtest-bpf-next-PR success PR summary
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netdev/fixes_present success Fixes tag not required for -next series
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netdev/tree_selection success Clearly marked for bpf-next
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netdev/cc_maintainers warning 7 maintainers not CCed: andrii@kernel.org songliubraving@fb.com yhs@fb.com john.fastabend@gmail.com kafai@fb.com netdev@vger.kernel.org kpsingh@kernel.org
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netdev/build_32bit success Errors and warnings before: 0 this patch: 0
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netdev/verify_fixes success No Fixes tag
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 23 lines checked
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netdev/header_inline success No static functions without inline keyword in header files
bpf/vmtest-bpf-next success VM_Test

Commit Message

Ilya Leoshkevich Oct. 13, 2021, 4:09 p.m. UTC 
Non-aligned integers are dumped as bields, which is supported for at
most 64-bit integers. Fix by using the same trick as
btf_dump_float_data(): copy non-aligned values to the local buffer.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 tools/lib/bpf/btf_dump.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/tools/lib/bpf/btf_dump.c b/tools/lib/bpf/btf_dump.c
index 614719c73bd7..25ce60828e8d 100644
--- a/tools/lib/bpf/btf_dump.c
+++ b/tools/lib/bpf/btf_dump.c
@@ -1670,9 +1670,10 @@  static int btf_dump_int_data(struct btf_dump *d,
 {
 	__u8 encoding = btf_int_encoding(t);
 	bool sign = encoding & BTF_INT_SIGNED;
+	char buf[16] __aligned(16);
 	int sz = t->size;
 
-	if (sz == 0) {
+	if (sz == 0 || sz > sizeof(buf)) {
 		pr_warn("unexpected size %d for id [%u]\n", sz, type_id);
 		return -EINVAL;
 	}
@@ -1680,8 +1681,10 @@  static int btf_dump_int_data(struct btf_dump *d,
 	/* handle packed int data - accesses of integers not aligned on
 	 * int boundaries can cause problems on some platforms.
 	 */
-	if (!ptr_is_aligned(data, sz))
-		return btf_dump_bitfield_data(d, t, data, 0, 0);
+	if (!ptr_is_aligned(data, sz)) {
+		memcpy(buf, data, sz);
+		data = buf;
+	}
 
 	switch (sz) {
 	case 16: {