From: Helge Deller Date: Wed, 8 Dec 2021 10:06:52 +0000 (+0100) Subject: parisc: Clear stale IIR value on instruction access rights trap X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=d01e9ce1af6116f812491d3d3873d204f10ae0b8;p=linux-block.git parisc: Clear stale IIR value on instruction access rights trap [ Upstream commit 484730e5862f6b872dca13840bed40fd7c60fa26 ] When a trap 7 (Instruction access rights) occurs, this means the CPU couldn't execute an instruction due to missing execute permissions on the memory region. In this case it seems the CPU didn't even fetched the instruction from memory and thus did not store it in the cr19 (IIR) register before calling the trap handler. So, the trap handler will find some random old stale value in cr19. This patch simply overwrites the stale IIR value with a constant magic "bad food" value (0xbaadf00d), in the hope people don't start to try to understand the various random IIR values in trap 7 dumps. Noticed-by: John David Anglin Signed-off-by: Helge Deller Signed-off-by: Sasha Levin --- diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c index a52c7abf2ca4..43f56335759a 100644 --- a/arch/parisc/kernel/traps.c +++ b/arch/parisc/kernel/traps.c @@ -729,6 +729,8 @@ void notrace handle_interruption(int code, struct pt_regs *regs) } mmap_read_unlock(current->mm); } + /* CPU could not fetch instruction, so clear stale IIR value. */ + regs->iir = 0xbaadf00d; fallthrough; case 27: /* Data memory protection ID trap */