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selftests/bpf: Make sure TLD_DEFINE_KEY runs first

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Without specifying constructor priority of the hidden constructor
function defined by TLD_DEFINE_KEY, __tld_create_key(..., dyn_data =
false) may run after tld_get_data() called from other constructors.
Threads calling tld_get_data() before __tld_create_key(..., dyn_data
= false) will not allocate enough memory for all TLDs and later result
in OOB access. Therefore, set it to the lowest value available to
users. Note that lower means higher priority and 0-100 is reserved to
the compiler.

Acked-by: Mykyta Yatsenko <yatsenko@meta.com>
Signed-off-by: Amery Hung <ameryhung@gmail.com>
Acked-by: Sun Jian <sun.jian.kdev@gmail.com>
Link: https://lore.kernel.org/r/20260331213555.1993883-4-ameryhung@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Amery Hung
2026-03-31 14:35:53 -07:00
committed by Alexei Starovoitov
parent bb6d9f5cf1
commit 80aa8e9c64
1 changed files with 1 additions and 1 deletions
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2
tools/testing/selftests/bpf/prog_tests/task_local_data.h
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@@ -278,7 +278,7 @@ retry:
#define TLD_DEFINE_KEY(key, name, size) \
tld_key_t key; \
\
__attribute__((constructor)) \
__attribute__((constructor(101))) \
void __tld_define_key_##key(void) \
{ \
key = __tld_create_key(name, size, false); \