Intravision/reactos
1
0
Fork 0
mirror of https://github.com/reactos/reactos.git synced 2024-09-29 05:54:05 +00:00
Code Issues Packages Projects Releases Wiki Activity

[NTOSKRNL]

Browse source 
Merge r62304 and r65253 from kernel-fun branch:
Fix logic in ObSetSecurityDescriptorInfo. To understand the change: it is not only style change! The old code modified SecurityDescriptor, which must always stay the same in the loop!

svn path=/trunk/; revision=65254
This commit is contained in:
Timo Kreuzer 2014-11-04 20:41:10 +00:00
parent 4e41ff66c0
commit afc42dae68
1 changed files with 43 additions and 50 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

93
reactos/ntoskrnl/ob/obsecure.c
View file

@ -144,61 +144,54 @@ ObSetSecurityDescriptorInfo(IN PVOID Object,
&NewDescriptor,
PoolType,
GenericMapping);
if (NT_SUCCESS(Status))
{
/* Now add this to the cache */
Status = ObLogSecurityDescriptor(NewDescriptor,
&CachedDescriptor,
MAX_FAST_REFS + 1);
/* Let go of our uncached copy */
ExFreePool(NewDescriptor);
/* Check for success */
if (NT_SUCCESS(Status))
{
/* Do the swap */
FastRef = (PEX_FAST_REF)OutputSecurityDescriptor;
OldValue = ExCompareSwapFastReference(FastRef,
CachedDescriptor,
OldDescriptor);
/* Get the security descriptor */
SecurityDescriptor = ExGetObjectFastReference(OldValue);
Count = ExGetCountFastReference(OldValue);
/* Make sure the swap worked */
if (SecurityDescriptor == OldDescriptor)
{
/* Flush waiters */
ObpAcquireObjectLock(ObjectHeader);
ObpReleaseObjectLock(ObjectHeader);
/* And dereference the old one */
ObDereferenceSecurityDescriptor(OldDescriptor, Count + 2);
break;
}
else
{
/* Someone changed it behind our back -- try again */
ObDereferenceSecurityDescriptor(OldDescriptor, 1);
ObDereferenceSecurityDescriptor(CachedDescriptor,
MAX_FAST_REFS + 1);
}
}
else
{
/* We failed, dereference the old one */
ObDereferenceSecurityDescriptor(OldDescriptor, 1);
break;
}
}
else
if (!NT_SUCCESS(Status))
{
/* We failed, dereference the old one */
if (OldDescriptor) ObDereferenceSecurityDescriptor(OldDescriptor, 1);
break;
}
/* Now add this to the cache */
Status = ObLogSecurityDescriptor(NewDescriptor,
&CachedDescriptor,
MAX_FAST_REFS + 1);
/* Let go of our uncached copy */
ExFreePool(NewDescriptor);
/* Check for success */
if (!NT_SUCCESS(Status))
{
/* We failed, dereference the old one */
ObDereferenceSecurityDescriptor(OldDescriptor, 1);
break;
}
/* Do the swap */
FastRef = (PEX_FAST_REF)OutputSecurityDescriptor;
OldValue = ExCompareSwapFastReference(FastRef,
CachedDescriptor,
OldDescriptor);
/* Make sure the swap worked */
if (ExGetObjectFastReference(OldValue) == OldDescriptor)
{
/* Flush waiters */
ObpAcquireObjectLock(ObjectHeader);
ObpReleaseObjectLock(ObjectHeader);
/* And dereference the old one */
Count = ExGetCountFastReference(OldValue);
ObDereferenceSecurityDescriptor(OldDescriptor, Count + 2);
break;
}
else
{
/* Someone changed it behind our back -- try again */
ObDereferenceSecurityDescriptor(OldDescriptor, 1);
ObDereferenceSecurityDescriptor(CachedDescriptor,
MAX_FAST_REFS + 1);
}
}
/* Return status */