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authorEric W. Biederman <ebiederm@xmission.com>2013-03-18 17:03:03 -0700
committerTony Luck <tony.luck@intel.com>2013-03-19 16:14:52 -0700
commitdeb60015096102f9842b631dcad98a05001268e9 (patch)
treea4265400e5aa66fa31b24b68c8473ca1cf972acb /arch/ia64/kernel
parentd7c6797fbc2c2efa7573817685d2a76fd274d2de (diff)
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Fix broken fsys_getppid()
In particular fsys_getppid always returns the ppid in the initial pid namespace so it does not work for a process in a pid namespace. Fix from Eric Biederman just removes the fast system call path. While it is a little bit sad to see another one of these bite the dust ... I can't imagine that getppid() is really on any real applications critical path. Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel')
-rw-r--r--arch/ia64/kernel/fsys.S49
1 files changed, 1 insertions, 48 deletions
diff --git a/arch/ia64/kernel/fsys.S b/arch/ia64/kernel/fsys.S
index c4cd45d97749..abc6dee3799c 100644
--- a/arch/ia64/kernel/fsys.S
+++ b/arch/ia64/kernel/fsys.S
@@ -90,53 +90,6 @@ ENTRY(fsys_getpid)
FSYS_RETURN
END(fsys_getpid)
-ENTRY(fsys_getppid)
- .prologue
- .altrp b6
- .body
- add r17=IA64_TASK_GROUP_LEADER_OFFSET,r16
- ;;
- ld8 r17=[r17] // r17 = current->group_leader
- add r9=TI_FLAGS+IA64_TASK_SIZE,r16
- ;;
-
- ld4 r9=[r9]
- add r17=IA64_TASK_REAL_PARENT_OFFSET,r17 // r17 = &current->group_leader->real_parent
- ;;
- and r9=TIF_ALLWORK_MASK,r9
-
-1: ld8 r18=[r17] // r18 = current->group_leader->real_parent
- ;;
- cmp.ne p8,p0=0,r9
- add r8=IA64_TASK_TGID_OFFSET,r18 // r8 = &current->group_leader->real_parent->tgid
- ;;
-
- /*
- * The .acq is needed to ensure that the read of tgid has returned its data before
- * we re-check "real_parent".
- */
- ld4.acq r8=[r8] // r8 = current->group_leader->real_parent->tgid
-#ifdef CONFIG_SMP
- /*
- * Re-read current->group_leader->real_parent.
- */
- ld8 r19=[r17] // r19 = current->group_leader->real_parent
-(p8) br.spnt.many fsys_fallback_syscall
- ;;
- cmp.ne p6,p0=r18,r19 // did real_parent change?
- mov r19=0 // i must not leak kernel bits...
-(p6) br.cond.spnt.few 1b // yes -> redo the read of tgid and the check
- ;;
- mov r17=0 // i must not leak kernel bits...
- mov r18=0 // i must not leak kernel bits...
-#else
- mov r17=0 // i must not leak kernel bits...
- mov r18=0 // i must not leak kernel bits...
- mov r19=0 // i must not leak kernel bits...
-#endif
- FSYS_RETURN
-END(fsys_getppid)
-
ENTRY(fsys_set_tid_address)
.prologue
.altrp b6
@@ -614,7 +567,7 @@ paravirt_fsyscall_table:
data8 0 // chown
data8 0 // lseek // 1040
data8 fsys_getpid // getpid
- data8 fsys_getppid // getppid
+ data8 0 // getppid
data8 0 // mount
data8 0 // umount
data8 0 // setuid // 1045