[GIT PULL 0/2] EFI urgent fixes

[GIT PULL 0/2] EFI urgent fixes

[Matt Fleming]

Folks, please pull the following urgent patches which fix a boot crash
when using the "noefi" parameter and the debug output on arm.

The following changes since commit 1a695a905c18548062509178b98bc91e67510864:

  Linux 4.7-rc1 (2016-05-29 09:29:24 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi.git tags/efi-urgent

for you to fetch changes up to 1f0cf3892caeab20a99c19f5523499be77b533cd:

  efi/arm: Fix the format of debug message from efi (2016-05-30 22:51:53 +0100)

----------------------------------------------------------------
 * Fix crash when booting with the "noefi" kernel parameter, caused by
   recent changes to for_each_efi_memory_desc_in_map() - Vitaly Kuznetsov

 * Unscramble the debug output on arm when efi=debug and memblock=debug
   is passed on the kernel cmdline - Dennis Chen

----------------------------------------------------------------
Dennis Chen (1):
      efi/arm: Fix the format of debug message from efi

Vitaly Kuznetsov (1):
      efi: Fix for_each_efi_memory_desc_in_map() for empty memmaps

 drivers/firmware/efi/arm-init.c | 14 ++++++--------
 include/linux/efi.h             |  2 +-
 2 files changed, 7 insertions(+), 9 deletions(-)

[PATCH 1/2] efi: Fix for_each_efi_memory_desc_in_map() for empty memmaps

[Matt Fleming]

From: Vitaly Kuznetsov <vkuznets-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Commit 78ce248faa3c ("efi: Iterate over efi.memmap in
for_each_efi_memory_desc()") introduced a regression for systems booted
with 'noefi' kernel option. In particular, I observe early kernel hang in
efi_find_mirror() on for_each_efi_memory_desc() call. As we don't have
efi memmap we enter this iterator with the following parameters:

efi.memmap.map = 0, efi.memmap.map_end = 0, efi.memmap.desc_size = 28

for_each_efi_memory_desc_in_map() does the following comparison:

(md) <= (efi_memory_desc_t *)((m)->map_end - (m)->desc_size);

where md = 0, (m)->map_end = 0 and (m)->desc_size = 28 but when we subtract
something from a NULL pointer wrap around happens and we end up returning
invalid pointer.

Fixes: 78ce248faa3c ("efi: Iterate over efi.memmap in for_each_efi_memory_desc()")
Signed-off-by: Vitaly Kuznetsov <vkuznets-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: Mark Salter <msalter-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: "K. Y. Srinivasan" <kys-0li6OtcxBFHby3iVrkZq2A@public.gmane.org>
Signed-off-by: Matt Fleming <matt-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
---
 include/linux/efi.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/efi.h b/include/linux/efi.h
index c2db3ca22217..f196dd0b0f2f 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -1005,7 +1005,7 @@ extern int efi_memattr_apply_permissions(struct mm_struct *mm,
 /* Iterate through an efi_memory_map */
 #define for_each_efi_memory_desc_in_map(m, md)				   \
 	for ((md) = (m)->map;						   \
-	     (md) <= (efi_memory_desc_t *)((m)->map_end - (m)->desc_size); \
+	     ((void *)(md) + (m)->desc_size) <= (m)->map_end;		   \
 	     (md) = (void *)(md) + (m)->desc_size)
 
 /**
-- 
2.7.3

[PATCH 2/2] efi/arm: Fix the format of debug message from efi

[Matt Fleming]

From: Dennis Chen <dennis.chen-5wv7dgnIgG8@public.gmane.org>

When enable debug of efi and memblock with 'efi=debug memblock=debug' appended
to the kernel command line, the debug message output for earyly_con looks like:

[    0.000000] efi:   0x0000e1050000-0x0000e105ffff [Memory Mapped I/O  |RUN|  |  |  |  |  |  |   |  |  |  |UC]
[    0.000000] efi:   0x0000e1300000-0x0000e1300fff [Memory Mapped I/O  |RUN|  |  |  |  |  |  |   |  |  |  |UC]
[    0.000000] efi:   0x0000e8200000-0x0000e827ffff [Memory Mapped I/O  |RUN|  |  |  |  |  |  |   |  |  |  |UC]
[    0.000000] efi:   0x008000000000-0x008001e7ffff [Runtime Data       |RUN|  |  |  |  |  |  |   |WB|WT|WC|UC]
[    0.000000] memblock_add: [0x00008000000000-0x00008001e7ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
[    0.000000] *
...

This patch is trying to fix the above output messed up by memblock_add(),
so we can get below debug mesg looks more formally after applied:

[    0.000000] efi:   0x0000e1050000-0x0000e105ffff [Memory Mapped I/O  |RUN|  |  |  |  |  |  |   |  |  |  |UC]
[    0.000000] efi:   0x0000e1300000-0x0000e1300fff [Memory Mapped I/O  |RUN|  |  |  |  |  |  |   |  |  |  |UC]
[    0.000000] efi:   0x0000e8200000-0x0000e827ffff [Memory Mapped I/O  |RUN|  |  |  |  |  |  |   |  |  |  |UC]
[    0.000000] efi:   0x008000000000-0x008001e7ffff [Runtime Data       |RUN|  |  |  |  |  |  |   |WB|WT|WC|UC]*
[    0.000000] memblock_add: [0x00008000000000-0x00008001e7ffff] flags 0x0 early_init_dt_add_memory_arch+0x54/0x5c
...

Signed-off-by: Dennis Chen <dennis.chen-5wv7dgnIgG8@public.gmane.org>
Acked-by: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>
Cc: Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>
Cc: Steve Capper <steve.capper-5wv7dgnIgG8@public.gmane.org>
Cc: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
Cc: Ard Biesheuvel <ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Cc: linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: Steve McIntyre <steve-nt0JYOx6u4DQT0dZR+AlfA@public.gmane.org>
Cc: Steven Rostedt <rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org>
Cc: Dan Williams <dan.j.williams-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: Mark Salter <msalter-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Signed-off-by: Matt Fleming <matt-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org>
---
 drivers/firmware/efi/arm-init.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/firmware/efi/arm-init.c b/drivers/firmware/efi/arm-init.c
index a850cbc48d8d..c49d50e68aee 100644
--- a/drivers/firmware/efi/arm-init.c
+++ b/drivers/firmware/efi/arm-init.c
@@ -174,6 +174,7 @@ static __init void reserve_regions(void)
 {
 	efi_memory_desc_t *md;
 	u64 paddr, npages, size;
+	int resv;
 
 	if (efi_enabled(EFI_DBG))
 		pr_info("Processing EFI memory map:\n");
@@ -190,12 +191,14 @@ static __init void reserve_regions(void)
 		paddr = md->phys_addr;
 		npages = md->num_pages;
 
+		resv = is_reserve_region(md);
 		if (efi_enabled(EFI_DBG)) {
 			char buf[64];
 
-			pr_info("  0x%012llx-0x%012llx %s",
+			pr_info("  0x%012llx-0x%012llx %s%s\n",
 				paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1,
-				efi_md_typeattr_format(buf, sizeof(buf), md));
+				efi_md_typeattr_format(buf, sizeof(buf), md),
+				resv ? "*" : "");
 		}
 
 		memrange_efi_to_native(&paddr, &npages);
@@ -204,14 +207,9 @@ static __init void reserve_regions(void)
 		if (is_normal_ram(md))
 			early_init_dt_add_memory_arch(paddr, size);
 
-		if (is_reserve_region(md)) {
+		if (resv)
 			memblock_mark_nomap(paddr, size);
-			if (efi_enabled(EFI_DBG))
-				pr_cont("*");
-		}
 
-		if (efi_enabled(EFI_DBG))
-			pr_cont("\n");
 	}
 
 	set_bit(EFI_MEMMAP, &efi.flags);
-- 
2.7.3

Re: [GIT PULL 0/2] EFI urgent fixes

[Matt Fleming]

On Tue, 31 May, at 11:23:42AM, Matt Fleming wrote:
> Folks, please pull the following urgent patches which fix a boot crash
> when using the "noefi" parameter and the debug output on arm.
> 
> The following changes since commit 1a695a905c18548062509178b98bc91e67510864:
> 
>   Linux 4.7-rc1 (2016-05-29 09:29:24 -0700)
> 
> are available in the git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi.git tags/efi-urgent
> 
> for you to fetch changes up to 1f0cf3892caeab20a99c19f5523499be77b533cd:
> 
>   efi/arm: Fix the format of debug message from efi (2016-05-30 22:51:53 +0100)
> 
> ----------------------------------------------------------------
>  * Fix crash when booting with the "noefi" kernel parameter, caused by
>    recent changes to for_each_efi_memory_desc_in_map() - Vitaly Kuznetsov
> 
>  * Unscramble the debug output on arm when efi=debug and memblock=debug
>    is passed on the kernel cmdline - Dennis Chen
> 
> ----------------------------------------------------------------
> Dennis Chen (1):
>       efi/arm: Fix the format of debug message from efi
> 
> Vitaly Kuznetsov (1):
>       efi: Fix for_each_efi_memory_desc_in_map() for empty memmaps
> 
>  drivers/firmware/efi/arm-init.c | 14 ++++++--------
>  include/linux/efi.h             |  2 +-
>  2 files changed, 7 insertions(+), 9 deletions(-)

Ping? I see these patches queued up in tip/efi/urgent but they don't
appear to be in Linus' tree yet.

Re: [GIT PULL 0/2] EFI urgent fixes

[Ingo Molnar]

* Matt Fleming <matt@codeblueprint.co.uk> wrote:

> On Tue, 31 May, at 11:23:42AM, Matt Fleming wrote:
> > Folks, please pull the following urgent patches which fix a boot crash
> > when using the "noefi" parameter and the debug output on arm.
> > 
> > The following changes since commit 1a695a905c18548062509178b98bc91e67510864:
> > 
> >   Linux 4.7-rc1 (2016-05-29 09:29:24 -0700)
> > 
> > are available in the git repository at:
> > 
> >   git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi.git tags/efi-urgent
> > 
> > for you to fetch changes up to 1f0cf3892caeab20a99c19f5523499be77b533cd:
> > 
> >   efi/arm: Fix the format of debug message from efi (2016-05-30 22:51:53 +0100)
> > 
> > ----------------------------------------------------------------
> >  * Fix crash when booting with the "noefi" kernel parameter, caused by
> >    recent changes to for_each_efi_memory_desc_in_map() - Vitaly Kuznetsov
> > 
> >  * Unscramble the debug output on arm when efi=debug and memblock=debug
> >    is passed on the kernel cmdline - Dennis Chen
> > 
> > ----------------------------------------------------------------
> > Dennis Chen (1):
> >       efi/arm: Fix the format of debug message from efi
> > 
> > Vitaly Kuznetsov (1):
> >       efi: Fix for_each_efi_memory_desc_in_map() for empty memmaps
> > 
> >  drivers/firmware/efi/arm-init.c | 14 ++++++--------
> >  include/linux/efi.h             |  2 +-
> >  2 files changed, 7 insertions(+), 9 deletions(-)
> 
> Ping? I see these patches queued up in tip/efi/urgent but they don't
> appear to be in Linus' tree yet.

Yeah, will get them to Linus later today.

Thanks,

	Ingo