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selftests/bpf: Prevent allocating data larger than a page

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Fix a bug in the task local data library that may allocate more than a
a page for tld_data_u. This may happen when users set a too large
TLD_DYN_DATA_SIZE, so check it when creating dynamic TLD fields and fix
the corresponding selftest.

Signed-off-by: Amery Hung <ameryhung@gmail.com>
Link: https://lore.kernel.org/r/20260413190259.358442-2-ameryhung@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Amery Hung
2026-04-13 12:02:57 -07:00
committed by Alexei Starovoitov
parent b3dde701e7
commit 36bf7beb9d
2 changed files with 15 additions and 6 deletions
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3
tools/testing/selftests/bpf/prog_tests/task_local_data.h
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@@ -241,7 +241,8 @@ retry:
* TLD_DYN_DATA_SIZE is allocated for tld_create_key()
*/
if (dyn_data) {
if (off + TLD_ROUND_UP(size, 8) > tld_meta_p->size)
if (off + TLD_ROUND_UP(size, 8) > tld_meta_p->size ||
tld_meta_p->size > TLD_PAGE_SIZE - sizeof(struct tld_data_u))
return (tld_key_t){-E2BIG};
} else {
if (off + TLD_ROUND_UP(size, 8) > TLD_PAGE_SIZE - sizeof(struct tld_data_u))