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[PARISC] Allow overriding personality with sys_personality

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And now suddenly, linux32 works on parisc...

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
This commit is contained in:
Kyle McMartin
2006-08-27 11:12:13 -04:00
committed by Matthew Wilcox
parent df570b9c28
commit 75a4958154
2 changed files with 47 additions and 2 deletions
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45
arch/parisc/kernel/sys_parisc.c
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@@ -31,6 +31,8 @@
#include <linux/shm.h>
#include <linux/smp_lock.h>
#include <linux/syscalls.h>
#include <linux/utsname.h>
#include <linux/personality.h>
int sys_pipe(int __user *fildes)
{
@@ -248,3 +250,46 @@ asmlinkage int sys_free_hugepages(unsigned long addr)
{
return -EINVAL;
}
long parisc_personality(unsigned long personality)
{
long err;
if (personality(current->personality) == PER_LINUX32
&& personality == PER_LINUX)
personality = PER_LINUX32;
err = sys_personality(personality);
if (err == PER_LINUX32)
err = PER_LINUX;
return err;
}
static inline int override_machine(char __user *mach) {
#ifdef CONFIG_COMPAT
if (personality(current->personality) == PER_LINUX32) {
if (__put_user(0, mach + 6) ||
__put_user(0, mach + 7))
return -EFAULT;
}
return 0;
#else /*!CONFIG_COMPAT*/
return 0;
#endif /*CONFIG_COMPAT*/
}
long parisc_newuname(struct new_utsname __user *utsname)
{
int err = 0;
down_read(&uts_sem);
if (copy_to_user(utsname, &system_utsname, sizeof(*utsname)))
err = -EFAULT;
up_read(&uts_sem);
err = override_machine(utsname->machine);
return (long)err;
}