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MIPS: Disable usermode switching of the FR bit for MIPS R5 CPUs.
authorRalf Baechle <ralf@linux-mips.org>
Thu, 19 Sep 2013 09:15:49 +0000 (11:15 +0200)
committerRalf Baechle <ralf@linux-mips.org>
Thu, 19 Sep 2013 09:23:10 +0000 (11:23 +0200)
commit8b8a7634315be747959b0165e38138879f93cf6c
tree8559e2a5ba5149aff5079713e28945b226faca96tree
parent2f9ee82c2a1af01966cedaa9cb144acb6fca9932commit | diff
MIPS: Disable usermode switching of the FR bit for MIPS R5 CPUs.

Currently the kernel will always use the FR=0 register model for O32.  If
an O32 application did enable FR=1 mode, some data from another application
might be leaked in the extra registers becoming visible.

Iow, this patch is meant to make the kernel MIPS R5 tolerant but leaves
proper MIPS R5 support to a future patchset.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
arch/mips/kernel/cpu-probe.c diff | blob | blame | history
Ubuntu Disco kernel mirror for Proxmox VE and PMG