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authorOleg Nesterov <oleg@redhat.com>2010-08-09 17:20:30 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-09 20:45:05 -0700
commit2ee7c922f20c96dba56fd378a466790d87f42e84 (patch)
tree9eda39ff1867c4695c1e7349045ccc23176b623b /kernel/exec_domain.c
parent5bf1d290b57e392eaf4bfb15c67f315fce4140be (diff)
sys_personality: remove the bogus checks in sys_personality()->__set_personality() path
Cleanup, no functional changes. - __set_personality() always changes ->exec_domain/personality, the special case when ->exec_domain remains the same buys nothing but complicates the code. Unify both cases to simplify the code. - The -EINVAL check in sys_personality() was never right. If we assume that set_personality() can fail we should check the value it returns instead of verifying that task->personality was actually changed. Remove it. Before the previous patch it was possible to hit this case due to overflow problems, but this -EINVAL just indicated the kernel bug. OTOH, probably it makes sense to change lookup_exec_domain() to return ERR_PTR() instead of default_exec_domain if the search in exec_domains list fails, and report this error to the user-space. But this means another user-space change, and we have in-kernel users which need fixes. For example, PER_OSF4 falls into PER_MASK for unkown reason and nobody cares to register this domain. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: Wenming Zhang <wezhang@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/exec_domain.c')
-rw-r--r--kernel/exec_domain.c22
1 files changed, 5 insertions, 17 deletions
diff --git a/kernel/exec_domain.c b/kernel/exec_domain.c
index dd62f8e714ca..0dbeae374225 100644
--- a/kernel/exec_domain.c
+++ b/kernel/exec_domain.c
@@ -134,23 +134,14 @@ unregister:
return 0;
}
-int
-__set_personality(unsigned int personality)
+int __set_personality(unsigned int personality)
{
- struct exec_domain *ep, *oep;
-
- ep = lookup_exec_domain(personality);
- if (ep == current_thread_info()->exec_domain) {
- current->personality = personality;
- module_put(ep->module);
- return 0;
- }
+ struct exec_domain *oep = current_thread_info()->exec_domain;
+ current_thread_info()->exec_domain = lookup_exec_domain(personality);
current->personality = personality;
- oep = current_thread_info()->exec_domain;
- current_thread_info()->exec_domain = ep;
-
module_put(oep->module);
+
return 0;
}
@@ -192,11 +183,8 @@ SYSCALL_DEFINE1(personality, unsigned int, personality)
{
unsigned int old = current->personality;
- if (personality != 0xffffffff) {
+ if (personality != 0xffffffff)
set_personality(personality);
- if (current->personality != personality)
- return -EINVAL;
- }
return old;
}

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