selftests/bpf: Add exception tests with stack arguments

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Add tests to verify that bpf_throw() correctly unwinds the stack
when the program uses outgoing stack arguments (functions with >5
args). Without the preceding x86 fix, these tests crash the kernel
on x86 due to corrupted callee-saved register restore. There is
no change for arm64 to support exception with stack arguments.

Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20260517150707.289273-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Yonghong Song 2026-05-17 08:07:07 -07:00 • committed by Alexei Starovoitov

parent 18a37465b0

commit 576482b55c

2 changed files with 121 additions and 0 deletions

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7

tools/testing/selftests/bpf/prog_tests/exceptions.c

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114

tools/testing/selftests/bpf/progs/exceptions.c

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