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selftests/bpf: Fix task_local_data data allocation size

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Currently, when allocating memory for data, size of tld_data_u->start
is not taken into account. This may cause OOB access. Fixed it by adding
the non-flexible array part of tld_data_u.

Besides, explicitly align tld_data_u->data to 8 bytes in case some
fields are added before data in the future. It could break the
assumption that every data field is 8 byte aligned and
sizeof(tld_data_u) will no longer be equal to
offsetof(struct tld_data_u, data), which we use interchangeably.

Signed-off-by: Amery Hung <ameryhung@gmail.com>
Acked-by: Sun Jian <sun.jian.kdev@gmail.com>
Link: https://lore.kernel.org/r/20260331213555.1993883-2-ameryhung@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Amery Hung
2026-03-31 14:35:51 -07:00
committed by Alexei Starovoitov
parent e8aec1058c
commit 7c8ca532a7
2 changed files with 8 additions and 6 deletions
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2
tools/testing/selftests/bpf/progs/task_local_data.bpf.h
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@@ -87,7 +87,7 @@ struct tld_meta_u {
struct tld_data_u {
__u64 start; /* offset of tld_data_u->data in a page */
char data[__PAGE_SIZE - sizeof(__u64)];
char data[__PAGE_SIZE - sizeof(__u64)] __attribute__((aligned(8)));
};
struct tld_map_value {