On Tue, May 12, 2020 at 05:33:20PM +0200, 'Andrey Konovalov' via kasan-dev
wrote:
> The kasan_report() functions belongs to report.c, as it's a common
> functions that does error reporting.
>
> Reported-by: Leon Romanovsky <[email protected]>
> Signed-off-by: Andrey Konovalov <[email protected]>
Today's linux-next produced this with Clang 11.
mm/kasan/report.o: warning: objtool: kasan_report()+0x8a: call to
__stack_chk_fail() with UACCESS enabled
kasan_report at mm/kasan/report.c:536
> ---
> mm/kasan/common.c | 19 -------------------
> mm/kasan/report.c | 22 ++++++++++++++++++++--
> 2 files changed, 20 insertions(+), 21 deletions(-)
>
> diff --git a/mm/kasan/common.c b/mm/kasan/common.c
> index 2906358e42f0..757d4074fe28 100644
> --- a/mm/kasan/common.c
> +++ b/mm/kasan/common.c
> @@ -33,7 +33,6 @@
> #include <linux/types.h>
> #include <linux/vmalloc.h>
> #include <linux/bug.h>
> -#include <linux/uaccess.h>
>
> #include <asm/cacheflush.h>
> #include <asm/tlbflush.h>
> @@ -613,24 +612,6 @@ void kasan_free_shadow(const struct vm_struct *vm)
> }
> #endif
>
> -extern void __kasan_report(unsigned long addr, size_t size, bool is_write,
> unsigned long ip);
> -extern bool report_enabled(void);
> -
> -bool kasan_report(unsigned long addr, size_t size, bool is_write, unsigned
> long ip)
> -{
> - unsigned long flags = user_access_save();
> - bool ret = false;
> -
> - if (likely(report_enabled())) {
> - __kasan_report(addr, size, is_write, ip);
> - ret = true;
> - }
> -
> - user_access_restore(flags);
> -
> - return ret;
> -}
> -
> #ifdef CONFIG_MEMORY_HOTPLUG
> static bool shadow_mapped(unsigned long addr)
> {
> diff --git a/mm/kasan/report.c b/mm/kasan/report.c
> index 80f23c9da6b0..51ec45407a0b 100644
> --- a/mm/kasan/report.c
> +++ b/mm/kasan/report.c
> @@ -29,6 +29,7 @@
> #include <linux/kasan.h>
> #include <linux/module.h>
> #include <linux/sched/task_stack.h>
> +#include <linux/uaccess.h>
>
> #include <asm/sections.h>
>
> @@ -454,7 +455,7 @@ static void print_shadow_for_address(const void *addr)
> }
> }
>
> -bool report_enabled(void)
> +static bool report_enabled(void)
> {
> if (current->kasan_depth)
> return false;
> @@ -479,7 +480,8 @@ void kasan_report_invalid_free(void *object, unsigned
> long ip)
> end_report(&flags);
> }
>
> -void __kasan_report(unsigned long addr, size_t size, bool is_write, unsigned
> long ip)
> +static void __kasan_report(unsigned long addr, size_t size, bool is_write,
> + unsigned long ip)
> {
> struct kasan_access_info info;
> void *tagged_addr;
> @@ -518,6 +520,22 @@ void __kasan_report(unsigned long addr, size_t size,
> bool is_write, unsigned lon
> end_report(&flags);
> }
>
> +bool kasan_report(unsigned long addr, size_t size, bool is_write,
> + unsigned long ip)
> +{
> + unsigned long flags = user_access_save();
> + bool ret = false;
> +
> + if (likely(report_enabled())) {
> + __kasan_report(addr, size, is_write, ip);
> + ret = true;
> + }
> +
> + user_access_restore(flags);
> +
> + return ret;
> +}
> +
> #ifdef CONFIG_KASAN_INLINE
> /*
> * With CONFIG_KASAN_INLINE, accesses to bogus pointers (outside the high
> --
> 2.26.2.645.ge9eca65c58-goog
>
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> https://groups.google.com/d/msgid/kasan-dev/78a81fde6eeda9db72a7fd55fbc33173a515e4b1.1589297433.git.andreyknvl%40google.com.
