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ARM/clkdev fixes for v6.10

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- Fix clkdev - erroring out on long strings causes boot failures, so
   don't do this. Still warn about the over-sized strings (which will
   never match and thus their registration with clkdev is useless.)
 
 - Fix for ftrace with frame pointer unwinder with recent GCC changing
   the way frames are stacked.
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rmk/linux

Pull ARM and clkdev fixes from Russell King:

 - Fix clkdev - erroring out on long strings causes boot failures, so
   don't do this. Still warn about the over-sized strings (which will
   never match and thus their registration with clkdev is useless)

 - Fix for ftrace with frame pointer unwinder with recent GCC changing
   the way frames are stacked.

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rmk/linux:
  ARM: 9405/1: ftrace: Don't assume stack frames are contiguous in memory
  clkdev: don't fail clkdev_alloc() if over-sized
This commit is contained in:
Linus Torvalds 2024-06-12 16:58:05 -07:00
commit 2ccbdf43d5
2 changed files with 24 additions and 4 deletions
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17
arch/arm/kernel/ftrace.c
View File

@ -232,11 +232,24 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
unsigned long old;
if (unlikely(atomic_read(&current->tracing_graph_pause)))
err_out:
return;
if (IS_ENABLED(CONFIG_UNWINDER_FRAME_POINTER)) {
/* FP points one word below parent's top of stack */
frame_pointer += 4;
/*
* Usually, the stack frames are contiguous in memory but cases
* have been observed where the next stack frame does not live
* at 'frame_pointer + 4' as this code used to assume.
*
* Instead, dereference the field in the stack frame that
* stores the SP of the calling frame: to avoid unbounded
* recursion, this cannot involve any ftrace instrumented
* functions, so use the __get_kernel_nofault() primitive
* directly.
*/
__get_kernel_nofault(&frame_pointer,
(unsigned long *)(frame_pointer - 8),
unsigned long, err_out);
} else {
struct stackframe frame = {
.fp = frame_pointer,

11
drivers/clk/clkdev.c
View File

@ -204,8 +204,15 @@ fail:
pr_err("%pV:%s: %s ID is greater than %zu\n",
&vaf, con_id, failure, max_size);
va_end(ap_copy);
kfree(cla);
return NULL;
/*
* Don't fail in this case, but as the entry won't ever match just
* fill it with something that also won't match.
*/
strscpy(cla->con_id, "bad", sizeof(cla->con_id));
strscpy(cla->dev_id, "bad", sizeof(cla->dev_id));
return &cla->cl;
}
static struct clk_lookup *