[LTP] [PATCH 1/2] stack_clash: Guard functions used only in 64bit

[LTP] [PATCH 1/2] stack_clash: Guard functions used only in 64bit

[Petr Vorel]

To avoid "defined but not used" warnings when compiled on 32bit.

Signed-off-by: Petr Vorel <pvorel@suse.cz>
---
 testcases/cve/stack_clash.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/testcases/cve/stack_clash.c b/testcases/cve/stack_clash.c
index 3a99c49bb..56b970a1b 100644
--- a/testcases/cve/stack_clash.c
+++ b/testcases/cve/stack_clash.c
@@ -92,6 +92,7 @@ void segv_handler(int sig, siginfo_t *info, void *data LTP_ATTRIBUTE_UNUSED)
 		_exit(EXIT_SUCCESS);
 }
 
+#ifdef __x86_64__
 static void force_bottom_up(void)
 {
 	FILE *fh;
@@ -134,6 +135,7 @@ static void force_bottom_up(void)
 out:
 	SAFE_FCLOSE(fh);
 }
+#endif
 
 unsigned long read_stack_addr_from_proc(unsigned long *stack_size)
 {
@@ -187,6 +189,7 @@ void __attribute__((noinline)) preallocate_stack(unsigned long required)
 	garbage[0] = garbage[required - 1] = '\0';
 }
 
+#ifdef __x86_64__
 static void do_mmap_placement_test(unsigned long stack_addr, unsigned long gap)
 {
 	void *map_test_gap;
@@ -208,6 +211,7 @@ static void do_mmap_placement_test(unsigned long stack_addr, unsigned long gap)
 		SAFE_MUNMAP(map_test_gap, MAPPED_LEN);
 	}
 }
+#endif
 
 void do_child(void)
 {
-- 
2.42.0


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[LTP] [PATCH 2/2] stack_clash: Compile with -Wno-infinite-recursion

[Petr Vorel]

The algorithm is based on recursive calling of exhaust_stack_into_sigsegv(),
remove the warning.

Signed-off-by: Petr Vorel <pvorel@suse.cz>
---
 testcases/cve/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/testcases/cve/Makefile b/testcases/cve/Makefile
index c5308794d..01b9b9ccb 100644
--- a/testcases/cve/Makefile
+++ b/testcases/cve/Makefile
@@ -7,7 +7,7 @@ include $(top_srcdir)/include/mk/testcases.mk
 
 CFLAGS			+= -D_GNU_SOURCE
 
-stack_clash:	CFLAGS += -fno-optimize-sibling-calls
+stack_clash:	CFLAGS += -fno-optimize-sibling-calls -Wno-infinite-recursion
 
 cve-2016-7042:	LDLIBS += $(KEYUTILS_LIBS)
 
-- 
2.42.0


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Re: [LTP] [PATCH 2/2] stack_clash: Compile with -Wno-infinite-recursion

[Cyril Hrubis]

Hi!
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>

-- 
Cyril Hrubis
chrubis@suse.cz

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Re: [LTP] [PATCH 2/2] stack_clash: Compile with -Wno-infinite-recursion

[Petr Vorel]

Hi Cyril,

thanks, merged!

Kind regards,
Petr

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Re: [LTP] [PATCH 1/2] stack_clash: Guard functions used only in 64bit

[Cyril Hrubis]

Hi!
> To avoid "defined but not used" warnings when compiled on 32bit.
> 
> Signed-off-by: Petr Vorel <pvorel@suse.cz>
> ---
>  testcases/cve/stack_clash.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/testcases/cve/stack_clash.c b/testcases/cve/stack_clash.c
> index 3a99c49bb..56b970a1b 100644
> --- a/testcases/cve/stack_clash.c
> +++ b/testcases/cve/stack_clash.c
> @@ -92,6 +92,7 @@ void segv_handler(int sig, siginfo_t *info, void *data LTP_ATTRIBUTE_UNUSED)
>  		_exit(EXIT_SUCCESS);
>  }
>  
> +#ifdef __x86_64__
>  static void force_bottom_up(void)
>  {
>  	FILE *fh;
> @@ -134,6 +135,7 @@ static void force_bottom_up(void)
>  out:
>  	SAFE_FCLOSE(fh);
>  }
> +#endif

Maybe I'm blind but this function does not seem to be called from inside
of #ifdef __x86_64__.

>  unsigned long read_stack_addr_from_proc(unsigned long *stack_size)
>  {
> @@ -187,6 +189,7 @@ void __attribute__((noinline)) preallocate_stack(unsigned long required)
>  	garbage[0] = garbage[required - 1] = '\0';
>  }
>  
> +#ifdef __x86_64__
>  static void do_mmap_placement_test(unsigned long stack_addr, unsigned long gap)
>  {
>  	void *map_test_gap;
> @@ -208,6 +211,7 @@ static void do_mmap_placement_test(unsigned long stack_addr, unsigned long gap)
>  		SAFE_MUNMAP(map_test_gap, MAPPED_LEN);
>  	}
>  }
> +#endif

This part looks good.

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Re: [LTP] [PATCH 1/2] stack_clash: Guard functions used only in 64bit

[Petr Vorel]

Hi Cyril,

> Hi!
> > To avoid "defined but not used" warnings when compiled on 32bit.

> > Signed-off-by: Petr Vorel <pvorel@suse.cz>
> > ---
> >  testcases/cve/stack_clash.c | 4 ++++
> >  1 file changed, 4 insertions(+)

> > diff --git a/testcases/cve/stack_clash.c b/testcases/cve/stack_clash.c
Hi Cyril,

> > +#ifdef __x86_64__
> >  static void force_bottom_up(void)
> >  {
> >  	FILE *fh;
> > @@ -134,6 +135,7 @@ static void force_bottom_up(void)
> >  out:
> >  	SAFE_FCLOSE(fh);
> >  }
> > +#endif

> Maybe I'm blind but this function does not seem to be called from inside
> of #ifdef __x86_64__.

force_bottom_up() is called only inside do_mmap_placement_test(), which is also
wrapped with #ifdef __x86_64_.

I did not notice that, compiler pointed it out :).

Can I merge with your RBT?

Kind regards,
Petr

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Re: [LTP] [PATCH 1/2] stack_clash: Guard functions used only in 64bit

[Cyril Hrubis]

Hi!
> force_bottom_up() is called only inside do_mmap_placement_test(), which is also
> wrapped with #ifdef __x86_64_.
> 
> I did not notice that, compiler pointed it out :).

Ah I was blind yesterday, sorry.

> Can I merge with your RBT?

Of course.

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chrubis@suse.cz

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Re: [LTP] [PATCH 1/2] stack_clash: Guard functions used only in 64bit

[Petr Vorel]

Hi Cyril,

> Hi!
> > force_bottom_up() is called only inside do_mmap_placement_test(), which is also
> > wrapped with #ifdef __x86_64_.

> > I did not notice that, compiler pointed it out :).

> Ah I was blind yesterday, sorry.

No problem, thanks for a review, merged.

Kind regards,
Petr

> > Can I merge with your RBT?

> Of course.

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