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MIPS: vdso: Invalid GIC access through VDSO

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[ Upstream commit 47ce8527fb ]

Accessing raw timers (currently only CLOCK_MONOTONIC_RAW) through VDSO
doesn't return the correct time when using the GIC as clock source.
The address of the GIC mapped page is in this case not calculated
correctly. The GIC mapped page is calculated from the VDSO data by
subtracting PAGE_SIZE:

  void *get_gic(const struct vdso_data *data) {
    return (void __iomem *)data - PAGE_SIZE;
  }

However, the data pointer is not page aligned for raw clock sources.
This is because the VDSO data for raw clock sources (CS_RAW = 1) is
stored after the VDSO data for coarse clock sources (CS_HRES_COARSE = 0).
Therefore, only the VDSO data for CS_HRES_COARSE is page aligned:

  +--------------------+
  |                    |
  | vd[CS_RAW]         | ---+
  | vd[CS_HRES_COARSE] |    |
  +--------------------+    | -PAGE_SIZE
  |                    |    |
  |  GIC mapped page   | <--+
  |                    |
  +--------------------+

When __arch_get_hw_counter() is called with &vd[CS_RAW], get_gic returns
the wrong address (somewhere inside the GIC mapped page). The GIC counter
values are not returned which results in an invalid time.

Fixes: a7f4df4e21 ("MIPS: VDSO: Add implementations of gettimeofday() and clock_gettime()")
Signed-off-by: Martin Fäcknitz <faecknitz@hotsplots.de>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Martin Fäcknitz 2021-07-05 02:03:54 +02:00 committed by Greg Kroah-Hartman
parent d822ebcccc
commit 8553099bdb
1 changed files with 1 additions and 1 deletions
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2
arch/mips/vdso/vdso.h
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@ -81,7 +81,7 @@ static inline const union mips_vdso_data *get_vdso_data(void)
static inline void __iomem *get_gic(const union mips_vdso_data *data)
{
return (void __iomem *)data - PAGE_SIZE;
return (void __iomem *)((unsigned long)data & PAGE_MASK) - PAGE_SIZE;
}
#endif /* CONFIG_CLKSRC_MIPS_GIC */