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powerpc/livepatch: return -ERRNO values in save_stack_trace_tsk_reliable()

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To match its x86 counterpart, save_stack_trace_tsk_reliable() should
return -EINVAL in cases that it is currently returning 1.  No caller is
currently differentiating non-zero error codes, but let's keep the
arch-specific implementations consistent.

Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Joe Lawrence 2019-01-22 10:57:24 -05:00 committed by Michael Ellerman
parent 29a77bbb0c
commit 3de27dcf81
1 changed files with 7 additions and 7 deletions
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14
arch/powerpc/kernel/stacktrace.c
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@ -133,7 +133,7 @@ save_stack_trace_tsk_reliable(struct task_struct *tsk,
if (sp < stack_page + sizeof(struct thread_struct) ||
sp > stack_end - STACK_FRAME_MIN_SIZE) {
return 1;
return -EINVAL;
}
for (firstframe = true; sp != stack_end;
@ -143,16 +143,16 @@ save_stack_trace_tsk_reliable(struct task_struct *tsk,
/* sanity check: ABI requires SP to be aligned 16 bytes. */
if (sp & 0xF)
return 1;
return -EINVAL;
newsp = stack[0];
/* Stack grows downwards; unwinder may only go up. */
if (newsp <= sp)
return 1;
return -EINVAL;
if (newsp != stack_end &&
newsp > stack_end - STACK_FRAME_MIN_SIZE) {
return 1; /* invalid backlink, too far up. */
return -EINVAL; /* invalid backlink, too far up. */
}
/*
@ -166,13 +166,13 @@ save_stack_trace_tsk_reliable(struct task_struct *tsk,
/* Mark stacktraces with exception frames as unreliable. */
if (sp <= stack_end - STACK_INT_FRAME_SIZE &&
stack[STACK_FRAME_MARKER] == STACK_FRAME_REGS_MARKER) {
return 1;
return -EINVAL;
}
/* Examine the saved LR: it must point into kernel code. */
ip = stack[STACK_FRAME_LR_SAVE];
if (!__kernel_text_address(ip))
return 1;
return -EINVAL;
/*
* FIXME: IMHO these tests do not belong in
@ -185,7 +185,7 @@ save_stack_trace_tsk_reliable(struct task_struct *tsk,
* as unreliable.
*/
if (ip == (unsigned long)kretprobe_trampoline)
return 1;
return -EINVAL;
#endif
if (trace->nr_entries >= trace->max_entries)