diff options
Diffstat (limited to 'arch/x86/entry/vsyscall/vsyscall_64.c')
| -rw-r--r-- | arch/x86/entry/vsyscall/vsyscall_64.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/x86/entry/vsyscall/vsyscall_64.c b/arch/x86/entry/vsyscall/vsyscall_64.c index 317be365bce3..05eebbf9b989 100644 --- a/arch/x86/entry/vsyscall/vsyscall_64.c +++ b/arch/x86/entry/vsyscall/vsyscall_64.c @@ -127,6 +127,9 @@ bool emulate_vsyscall(struct pt_regs *regs, unsigned long address) int vsyscall_nr, syscall_nr, tmp; int prev_sig_on_uaccess_err; long ret; +#ifdef CONFIG_SYSCALL_PTREGS + unsigned long orig_dx; +#endif /* * No point in checking CS -- the only way to get here is a user mode @@ -227,19 +230,38 @@ bool emulate_vsyscall(struct pt_regs *regs, unsigned long address) ret = -EFAULT; switch (vsyscall_nr) { case 0: +#ifdef CONFIG_SYSCALL_PTREGS + /* this decodes regs->di and regs->si on its own */ + ret = sys_gettimeofday(regs); +#else ret = sys_gettimeofday( (struct timeval __user *)regs->di, (struct timezone __user *)regs->si); +#endif /* CONFIG_SYSCALL_PTREGS */ break; case 1: +#ifdef CONFIG_SYSCALL_PTREGS + /* this decodes regs->di on its own */ + ret = sys_time(regs); +#else ret = sys_time((time_t __user *)regs->di); +#endif /* CONFIG_SYSCALL_PTREGS */ break; case 2: +#ifdef CONFIG_SYSCALL_PTREGS + /* while we could clobber regs->dx, we didn't in the past... */ + orig_dx = regs->dx; + regs->dx = 0; + /* this decodes regs->di, regs->si and regs->dx on its own */ + ret = sys_getcpu(regs); + regs->dx = orig_dx; +#else ret = sys_getcpu((unsigned __user *)regs->di, (unsigned __user *)regs->si, NULL); +#endif /* CONFIG_SYSCALL_PTREGS */ break; } |