linux-kernel - Re: [PATCH v4 0/4] stackleak: Support Clang stack depth tracking

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Message-ID: <202507261446.8BDE8B8@keescook>
Date: Sat, 26 Jul 2025 14:47:59 -0700
From: Kees Cook <kees@...nel.org>
To: Nathan Chancellor <nathan@...nel.org>
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Subject: Re: [PATCH v4 0/4] stackleak: Support Clang stack depth tracking

On Fri, Jul 25, 2025 at 05:43:13PM -0700, Nathan Chancellor wrote:
>   ld.lld: error: undefined symbol: __sanitizer_cov_stack_depth
>   >>> referenced by atags_to_fdt.c

Proposed fix:
https://lore.kernel.org/lkml/20250726212945.work.975-kees@kernel.org/

>   kernel/kstack_erase.c:168:2: warning: function with attribute 'no_caller_saved_registers' should only call a function with attribute 'no_caller_saved_registers' or be compiled with '-mgeneral-regs-only' [-Wexcessive-regsave]

Proposed fix:
https://lore.kernel.org/lkml/20250726212615.work.800-kees@kernel.org/

>   In file included from kernel/fork.c:96:
>   include/linux/kstack_erase.h:29:37: error: passing 'const struct task_struct *' to parameter of type 'struct task_struct *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
>      29 |         return (unsigned long)end_of_stack(tsk) + sizeof(unsigned long);
>         |                                            ^~~
>   include/linux/sched/task_stack.h:56:63: note: passing argument to parameter 'p' here
>      56 | static inline unsigned long *end_of_stack(struct task_struct *p)
>         |                                                               ^

Proposed fix:
https://lore.kernel.org/lkml/20250726210641.work.114-kees@kernel.org/

Thanks for the reports! :)

-Kees

-- 
Kees Cook