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parisc: Fix ptrace check on syscall return 

The TIF_XXX flags are stored in the flags field in the thread_info
struct (TI_FLAGS), not in the flags field of the task_struct structure
(TASK_FLAGS).

It seems this bug didn't generate any important side-effects, otherwise it
wouldn't have went unnoticed for 12 years (since v2.6.32).

Signed-off-by: Helge Deller <deller@gmx.de>
Fixes: ecd3d4bc06 ("parisc: stop using task->ptrace for {single,block}step flags")
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: stable@vger.kernel.org
This commit is contained in:
Helge Deller 2021-10-05 00:27:49 +02:00
parent 9cc2fa4f4a
commit 8779e05ba8
1 changed files with 1 additions and 1 deletions
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2
arch/parisc/kernel/entry.S
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@ -1834,7 +1834,7 @@ syscall_restore:
LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
/* Are we being ptraced? */
ldw TASK_FLAGS(%r1),%r19
LDREG TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19
ldi _TIF_SYSCALL_TRACE_MASK,%r2
and,COND(=) %r19,%r2,%r0
b,n syscall_restore_rfi