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arm64: Introduce a way to disable the 32bit vdso 

We have a class of errata (grouped under the ARM64_WORKAROUND_1418040
banner) that force the trapping of counter access from 32bit EL0.

We would normally disable the whole vdso for such defect, except that
it would disable it for 64bit userspace as well, which is a shame.

Instead, add a new vdso_clock_mode, which signals that the vdso
isn't usable for compat tasks.  This gets checked in the new
vdso_clocksource_ok() helper, now provided for the 32bit vdso.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200706163802.1836732-2-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Marc Zyngier 2020-07-06 17:37:59 +01:00 committed by Will Deacon
parent b8c1c9fe6a
commit 97884ca8c2
2 changed files with 12 additions and 3 deletions
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7
arch/arm64/include/asm/vdso/clocksource.h
View File

@ -2,7 +2,10 @@
#ifndef __ASM_VDSOCLOCKSOURCE_H
#define __ASM_VDSOCLOCKSOURCE_H
#define VDSO_ARCH_CLOCKMODES \
VDSO_CLOCKMODE_ARCHTIMER
#define VDSO_ARCH_CLOCKMODES \
/* vdso clocksource for both 32 and 64bit tasks */ \
VDSO_CLOCKMODE_ARCHTIMER, \
/* vdso clocksource for 64bit tasks only */ \
VDSO_CLOCKMODE_ARCHTIMER_NOCOMPAT
#endif

8
arch/arm64/include/asm/vdso/compat_gettimeofday.h
View File

@ -111,7 +111,7 @@ static __always_inline u64 __arch_get_hw_counter(s32 clock_mode)
* update. Return something. Core will do another round and then
* see the mode change and fallback to the syscall.
*/
if (clock_mode == VDSO_CLOCKMODE_NONE)
if (clock_mode != VDSO_CLOCKMODE_ARCHTIMER)
return 0;
/*
@ -152,6 +152,12 @@ static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
return ret;
}
static inline bool vdso_clocksource_ok(const struct vdso_data *vd)
{
return vd->clock_mode == VDSO_CLOCKMODE_ARCHTIMER;
}
#define vdso_clocksource_ok vdso_clocksource_ok
#endif /* !__ASSEMBLY__ */
#endif /* __ASM_VDSO_GETTIMEOFDAY_H */