On Tue, Sep 15, 2020 at 11:16:16PM +0200, Andrey Konovalov wrote:
> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
> index cdc23662691c..ac79819317f2 100644
> --- a/arch/arm64/mm/fault.c
> +++ b/arch/arm64/mm/fault.c
> @@ -14,6 +14,7 @@
> #include <linux/mm.h>
> #include <linux/hardirq.h>
> #include <linux/init.h>
> +#include <linux/kasan.h>
> #include <linux/kprobes.h>
> #include <linux/uaccess.h>
> #include <linux/page-flags.h>
> @@ -295,17 +296,23 @@ static void die_kernel_fault(const char *msg, unsigned long addr,
> do_exit(SIGKILL);
> }
>
> +#ifdef CONFIG_KASAN_HW_TAGS
> static void report_tag_fault(unsigned long addr, unsigned int esr,
> struct pt_regs *regs)
> {
> - bool is_write = ((esr & ESR_ELx_WNR) >> ESR_ELx_WNR_SHIFT) != 0;
> + bool is_write = ((esr & ESR_ELx_WNR) >> ESR_ELx_WNR_SHIFT) != 0;
>
> - pr_alert("Memory Tagging Extension Fault in %pS\n", (void *)regs->pc);
> - pr_alert(" %s at address %lx\n", is_write ? "Write" : "Read", addr);
> - pr_alert(" Pointer tag: [%02x], memory tag: [%02x]\n",
> - mte_get_ptr_tag(addr),
> - mte_get_mem_tag((void *)addr));
> + /*
> + * SAS bits aren't set for all faults reported in EL1, so we can't
> + * find out access size.
> + */
> + kasan_report(addr, 0, is_write, regs->pc);
> }
> +#else
> +/* Tag faults aren't enabled without CONFIG_KASAN_HW_TAGS. */
> +static inline void report_tag_fault(unsigned long addr, unsigned int esr,
> + struct pt_regs *regs) { }
> +#endif
So is there a point in introducing this function in an earlier patch,
just to remove its content here?
--
Catalin
