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Linux-Hardened: Restore align_vdso_addr #86

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Linux-Hardened: Restore align_vdso_addr #86

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1 change: 1 addition & 0 deletions arch/x86/include/asm/elf.h
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Original file line number Diff line number Diff line change
Expand Up @@ -407,4 +407,5 @@ struct va_alignment {
} ____cacheline_aligned;

extern struct va_alignment va_align;
extern unsigned long align_vdso_addr(unsigned long);
#endif /* _ASM_X86_ELF_H */
7 changes: 7 additions & 0 deletions arch/x86/kernel/sys_x86_64.c
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Expand Up @@ -52,6 +52,13 @@ static unsigned long get_align_bits(void)
return va_align.bits & get_align_mask();
}

unsigned long align_vdso_addr(unsigned long addr)
{
unsigned long align_mask = get_align_mask();
addr = (addr + align_mask) & ~align_mask;
return addr | get_align_bits();
}

static int __init control_va_addr_alignment(char *str)
{
/* guard against enabling this on other CPU families */
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