iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc/perf: Fix kernel address leak via sampling registers

Browse Source 
[ Upstream commit e1ebd0e5b9d0a10ba65e63a3514b6da8c6a5a819 ]

Current code in power_pmu_disable() does not clear the sampling
registers like Sampling Instruction Address Register (SIAR) and
Sampling Data Address Register (SDAR) after disabling the PMU. Since
these are userspace readable and could contain kernel addresses, add
code to explicitly clear the content of these registers.

Also add a "context synchronizing instruction" to enforce no further
updates to these registers as suggested by Power ISA v3.0B. From
section 9.4, on page 1108:

  "If an mtspr instruction is executed that changes the value of a
  Performance Monitor register other than SIAR, SDAR, and SIER, the
  change is not guaranteed to have taken effect until after a
  subsequent context synchronizing instruction has been executed (see
  Chapter 11. "Synchronization Requirements for Context Alterations"
  on page 1133)."

Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
[mpe: Massage change log and add ISA reference]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Ellerman 2018-03-21 17:10:24 +05:30 committed by Greg Kroah-Hartman
parent 83fb2a49cc
commit 55f43f3b10
1 changed files with 15 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
arch/powerpc/perf/core-book3s.c
View File

@ -1198,6 +1198,7 @@ static void power_pmu_disable(struct pmu *pmu)
*/
write_mmcr0(cpuhw, val);
mb();
isync();
/*
* Disable instruction sampling if it was enabled
@ -1206,12 +1207,26 @@ static void power_pmu_disable(struct pmu *pmu)
mtspr(SPRN_MMCRA,
cpuhw->mmcr[2] & ~MMCRA_SAMPLE_ENABLE);
mb();
isync();
}
cpuhw->disabled = 1;
cpuhw->n_added = 0;
ebb_switch_out(mmcr0);
#ifdef CONFIG_PPC64
/*
* These are readable by userspace, may contain kernel
* addresses and are not switched by context switch, so clear
* them now to avoid leaking anything to userspace in general
* including to another process.
*/
if (ppmu->flags & PPMU_ARCH_207S) {
mtspr(SPRN_SDAR, 0);
mtspr(SPRN_SIAR, 0);
}
#endif
}
local_irq_restore(flags);