s390/bpf: Maintain 8-byte stack alignment

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Certain kernel functions (e.g. get_vtimer/set_vtimer) cause kernel
panic when the stack is not 8-byte aligned. Currently JITed BPF programs
may trigger this by allocating stack frames with non-rounded sizes and
then being interrupted. Fix by using rounded fp->aux->stack_depth.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200602174339.2501066-1-iii@linux.ibm.com

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Ilya Leoshkevich 2020-06-02 19:43:39 +02:00 • committed by Daniel Borkmann

parent 7cec0b9271

commit effe5be177

1 changed files with 10 additions and 9 deletions

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arch/s390/net/bpf_jit_comp.c

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