MIPS: ptrace: Fix FP context restoration FCSR regression

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commit 4249548454 upstream.

Fix a floating-point context restoration regression introduced with
commit 9b26616c8d ("MIPS: Respect the ISA level in FCSR handling")
that causes a Floating Point exception and consequently a kernel oops
with hard float configurations when one or more FCSR Enable and their
corresponding Cause bits are set both at a time via a ptrace(2) call.

To do so reinstate Cause bit masking originally introduced with commit
b1442d39fa ("MIPS: Prevent user from setting FCSR cause bits") to
address this exact problem and then inadvertently removed from the
PTRACE_SETFPREGS request with the commit referred above.

Signed-off-by: Maciej W. Rozycki <macro@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13238/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

This commit is contained in:

Maciej W. Rozycki 2016-05-12 10:18:27 +01:00 • committed by Ben Hutchings

parent b18b5d55c0

commit e22cb76130

1 changed files with 1 additions and 0 deletions

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arch/mips/kernel/ptrace.c

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