linux

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Xin Li 39163d5479 x86/vdso: Choose the right GDT_ENTRY_CPUNODE for 32-bit getcpu() on 64-bit kernel

The vDSO getcpu() reads CPU ID from the GDT_ENTRY_CPUNODE entry when the RDPID
instruction is not available. And GDT_ENTRY_CPUNODE is defined as 28 on 32-bit
Linux kernel and 15 on 64-bit. But the 32-bit getcpu() on 64-bit Linux kernel
is compiled with 32-bit Linux kernel GDT_ENTRY_CPUNODE, i.e., 28, beyond the
64-bit Linux kernel GDT limit. Thus, it just fails _silently_.

When BUILD_VDSO32_64 is defined, choose the 64-bit Linux kernel GDT definitions
to compile the 32-bit getcpu().

Fixes: 877cff5296faa6e ("x86/vdso: Fake 32bit VDSO build on 64bit compile for vgetcpu")
Reported-by: kernel test robot <yujie.liu@intel.com>
Reported-by: Shan Kang <shan.kang@intel.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230322061758.10639-1-xin3.li@intel.com
Link: https://lore.kernel.org/oe-lkp/202303020903.b01fd1de-yujie.liu@intel.com

2023-08-08 09:31:43 +02:00

alpha

Merge branch 'expand-stack'

2023-06-28 20:35:21 -07:00

arc

asm-generic updates for 6.5

2023-07-06 10:06:04 -07:00

arm

ARM: SoC fixes for 6.5, part 2

2023-08-02 18:21:12 -07:00

arm64

More SVE/SME fixes for ptrace() and for the (potentially future) case