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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-23 14:29:43 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-23 14:29:43 +0200 |
| commit | 7706abf5a0eb4c082897fd2a17a0ac0898e39666 (patch) | |
| tree | 982d22365f1aeedc43a796ef816cf1b1fa8480a7 /arch/powerpc/kernel/signal_64.c | |
| parent | staging: vc04_services: Remove unnecessary braces (diff) | |
| parent | Linux 4.14-rc6 (diff) | |
| download | linux-7706abf5a0eb4c082897fd2a17a0ac0898e39666.tar.xz linux-7706abf5a0eb4c082897fd2a17a0ac0898e39666.zip | |
Merge 4.14-rc6 into staging-next
We want the IIO and staging driver fixes in here as well.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/powerpc/kernel/signal_64.c')
| -rw-r--r-- | arch/powerpc/kernel/signal_64.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c index c83c115858c1..b2c002993d78 100644 --- a/arch/powerpc/kernel/signal_64.c +++ b/arch/powerpc/kernel/signal_64.c @@ -452,9 +452,20 @@ static long restore_tm_sigcontexts(struct task_struct *tsk, if (MSR_TM_RESV(msr)) return -EINVAL; - /* pull in MSR TM from user context */ + /* pull in MSR TS bits from user context */ regs->msr = (regs->msr & ~MSR_TS_MASK) | (msr & MSR_TS_MASK); + /* + * Ensure that TM is enabled in regs->msr before we leave the signal + * handler. It could be the case that (a) user disabled the TM bit + * through the manipulation of the MSR bits in uc_mcontext or (b) the + * TM bit was disabled because a sufficient number of context switches + * happened whilst in the signal handler and load_tm overflowed, + * disabling the TM bit. In either case we can end up with an illegal + * TM state leading to a TM Bad Thing when we return to userspace. + */ + regs->msr |= MSR_TM; + /* pull in MSR LE from user context */ regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE); |