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Unconditionally perform checks that FPU region was entered, when #NM

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exception is caught in kernel mode.  There are third-party modules
which trigger the issue, and since the problem causes usermode state
corruption at least, panic in production kernels as well.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2016-08-10 13:44:03 +00:00
parent 2d700cb557
commit e42f8233fc
2 changed files with 4 additions and 4 deletions
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4
sys/amd64/amd64/trap.c
View File

@ -443,8 +443,8 @@ trap(struct trapframe *frame)
goto out;
case T_DNA:
KASSERT(!PCB_USER_FPU(td->td_pcb),
("Unregistered use of FPU in kernel"));
if (PCB_USER_FPU(td->td_pcb))
panic("Unregistered use of FPU in kernel");
fpudna();
goto out;

4
sys/i386/i386/trap.c
View File

@ -540,8 +540,8 @@ trap(struct trapframe *frame)
case T_DNA:
#ifdef DEV_NPX
KASSERT(!PCB_USER_FPU(td->td_pcb),
("Unregistered use of FPU in kernel"));
if (PCB_USER_FPU(td->td_pcb))
panic("Unregistered use of FPU in kernel");
if (npxdna())
goto out;
#endif