riscv: add icache flush for nommu sigreturn trampoline

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In a NOMMU kernel, sigreturn trampolines are generated on the user
stack by setup_rt_frame. Currently, these trampolines are not instruction
fenced, thus their visibility to ifetch is not guaranteed.

This patch adds a flush_icache_range in setup_rt_frame to fix this
problem.

Signed-off-by: Mathis Salmen <mathis.salmen@matsal.de>
Fixes: 6bd33e1ece ("riscv: add nommu support")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230406101130.82304-1-mathis.salmen@matsal.de
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

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Mathis Salmen 2023-04-06 12:11:31 +02:00 • committed by Palmer Dabbelt

parent 4622f15909

commit 8d73648274

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1 changed files with 8 additions and 1 deletions

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arch/riscv/kernel/signal.c

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