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[PARISC] fix personality flag check in copy_thread()

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Directly comparing task_struct->personality against PER_* is not fully
correct, as it doesn't take flags potentially stored in top three bytes
into account.

Analogically, directly forcefully setting personality to PER_LINUX32 or
PER_LINUX discards any flags stored in the top three bytes.

Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Jiri Kosina 2012-08-02 15:33:59 +02:00 committed by James Bottomley
parent bba3d8c3b3
commit 5b24c42162
2 changed files with 5 additions and 5 deletions
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2
arch/parisc/kernel/process.c
View File

@ -309,7 +309,7 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
cregs->ksp = (unsigned long)stack
+ (pregs->gr[21] & (THREAD_SIZE - 1));
cregs->gr[30] = usp;
if (p->personality == PER_HPUX) {
if (personality(p->personality) == PER_HPUX) {
#ifdef CONFIG_HPUX
cregs->kpc = (unsigned long) &hpux_child_return;
#else

8
arch/parisc/kernel/sys_parisc.c
View File

@ -225,12 +225,12 @@ long parisc_personality(unsigned long personality)
long err;
if (personality(current->personality) == PER_LINUX32
&& personality == PER_LINUX)
personality = PER_LINUX32;
&& personality(personality) == PER_LINUX)
personality = (personality & ~PER_MASK) | PER_LINUX32;
err = sys_personality(personality);
if (err == PER_LINUX32)
err = PER_LINUX;
if (personality(err) == PER_LINUX32)
err = (err & ~PER_MASK) | PER_LINUX;
return err;
}