Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core

2015-11-05 Thread Sander Eikelenboom 

On 2015-11-05 00:13, Boris Ostrovsky wrote:

On 11/04/2015 03:02 PM, Sander Eikelenboom wrote:

On 2015-11-04 19:47, Stephen Smalley wrote:

On 11/04/2015 01:28 PM, Sander Eikelenboom wrote:

On 2015-11-04 16:52, Stephen Smalley wrote:

On 11/04/2015 06:55 AM, Sander Eikelenboom wrote:

Hi All,

I just tried to boot with the current linus mergewindow tree under 
Xen.
It fails with a kernel panic at boot with the new 
"CONFIG_DEBUG_WX"

option enabled.
Disabling it makes the kernel boot fine.

The splat:
[   18.424241] Freeing unused kernel memory: 1104K 
(822fc000 -

8241)
[   18.430314] Write protecting the kernel read-only data: 18432k
[   18.441054] Freeing unused kernel memory: 1144K 
(880001ae2000 -

880001c0)
[   18.447966] Freeing unused kernel memory: 1560K 
(88000207a000 -

88000220)
[   18.453947] BUG: unable to handle kernel paging request at
88055c883000
[   18.459943] IP: []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.465847] PGD 2212067 PUD 0
[   18.471564] Oops:  [#1] SMP
[   18.477248] Modules linked in:
[   18.482918] CPU: 2 PID: 1 Comm: swapper/0 Not tainted
4.3.0-mw-20151104-linus-doflr+ #1
[   18.488804] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640)  , 
BIOS

V1.8B1 09/13/2010
[   18.494778] task: 880059b9 ti: 880059b98000 
task.ti:

880059b98000
[   18.500852] RIP: e030:[] []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.507102] RSP: e02b:880059b9be48  EFLAGS: 00010296
[   18.513351] RAX: 88055c883000 RBX: 81ae2000 RCX:
8800
[   18.519733] RDX: 0067 RSI: 880059b9be98 RDI:
88001000
[   18.526129] RBP: 880059b9bf00 R08:  R09:

[   18.532522] R10: 88005fd0e790 R11: 0001 R12:
88008000
[   18.538891] R13: cfff R14: 880059b9be98 R15:

[   18.545247] FS:  () 
GS:88005f68()

knlGS:
[   18.551708] CS:  e033 DS:  ES:  CR0: 8005003b
[   18.558153] CR2: 88055c883000 CR3: 02211000 CR4:
0660
[   18.564686] Stack:
[   18.571106]  000159b9be50 82211000 88055c884000
0800
[   18.577704]  8000 88055c883000 0007
88005fd0e790
[   18.584291]  880059b9bed8 81156ace 0001

[   18.590916] Call Trace:
[   18.597458]  [] ? 
free_reserved_area+0x11e/0x120

[   18.604180]  []
ptdump_walk_pgd_level_checkwx+0x12/0x20
[   18.611014]  [] mark_rodata_ro+0xe9/0xf0
[   18.617819]  [] ? rest_init+0x80/0x80
[   18.624512]  [] kernel_init+0x18/0xe0
[   18.631095]  [] ret_from_fork+0x3f/0x70
[   18.637650]  [] ? rest_init+0x80/0x80
[   18.644178] Code: 70 ff ff ff 48 3b 85 58 ff ff ff 0f 84 c0 fe 
ff ff
48 8b 85 68 ff ff ff 48 c1 e0 10 48 c1 f8 10 48 89 45 b0 48 8b 85 
70 ff
ff ff <48> 8b 38 48 85 ff 0f 85 4e ff ff ff b9 02 00 00 00 31 d2 
4c 89

[   18.658246] RIP  []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.665211]  RSP 
[   18.672073] CR2: 88055c883000
[   18.678852] ---[ end trace d84e34461c40637a ]---
[   18.685641] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x0009
[   18.685641]
[   18.699520] Kernel Offset: disable



What's your .config?  Does cat /sys/kernel/debug/kernel_page_tables
produce a similar fault even with CONFIG_DEBUG_WX=n?


.config is attached

Hmm that sysfs file doesn't seem to exist then:
# cat /sys/kernel/debug/kernel_page_tables
cat: /sys/kernel/debug/kernel_page_tables: No such file or directory


Needs CONFIG_X86_PTDUMP=y.
Also assumes you have debugfs mounted there.


Recompiled, and the result is that it also blows up:



Can you try this:


diff --git a/arch/x86/mm/dump_pagetables.c 
b/arch/x86/mm/dump_pagetables.c

index 1bf417e..b534216 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -362,8 +362,13 @@ static void ptdump_walk_pgd_level_core(struct
seq_file *m, pgd_t *pgd,
bool checkwx)
 {
 #ifdef CONFIG_X86_64
+/* 8000 - 87ff is reserved for hypervisor */
+#define is_hypervisor_range(idx)  (paravirt_enabled() && \
+  ((idx >= pgd_index(__PAGE_OFFSET) - 16) && \
+   (idx < pgd_index(__PAGE_OFFSET
 pgd_t *start = (pgd_t *) _level4_pgt;
 #else
+#define is_hypervisor_range(idx)   0
 pgd_t *start = swapper_pg_dir;
 #endif
 pgprotval_t prot;
@@ -381,7 +386,7 @@ static void ptdump_walk_pgd_level_core(struct
seq_file *m, pgd_t *pgd,

 for (i = 0; i < PTRS_PER_PGD; i++) {
 st.current_address = normalize_addr(i * PGD_LEVEL_MULT);
-if (!pgd_none(*start)) {
+if (!pgd_none(*start) && !is_hypervisor_range(i)) {
 if (pgd_large(*start) || !pgd_present(*start)) {
 prot = pgd_flags(*start);
 note_page(m, , __pgprot(prot), 1);


Hi Boris,

Thank for your patch !
It makes "cat

Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core

2015-11-05 Thread Sander Eikelenboom 

Thursday, November 5, 2015, 2:53:40 PM, you wrote:

> On 11/05/2015 04:13 AM, Sander Eikelenboom wrote:
>>
>> It makes "cat /sys/kernel/debug/kernel_page_tables" work and
>> prevents a kernel with CONFIG_DEBUG_WX=y from crashing at boot.

> Great. Our nightly runs also failed spectacularly due to this bug.

>>
>> It now does give a warning about an insecure W+X mapping, so 
>> CONFIG_DEBUG_WX=y
>> seems to be working. No idea how to interpret it though (and if it's a 
>> legit
>> warning).
>>
>> -- 
>> Sander
>>
>> [   19.034706] Freeing unused kernel memory: 1104K (822fc000 - 
>> 8241)
>> [   19.041339] Write protecting the kernel read-only data: 18432k
>> [   19.052596] Freeing unused kernel memory: 1144K (880001ae2000 - 
>> 880001c0)
>> [   19.060285] Freeing unused kernel memory: 1560K (88000207a000 - 
>> 88000220)
>> [   19.067079] [ cut here ]
>> [   19.073931] WARNING: CPU: 5 PID: 1 at 
>> arch/x86/mm/dump_pagetables.c:225 note_page+0x619/0x7e0()

> Yes, this apparently is a known issue: https://lkml.org/lkml/2015/11/4/476

> -boris

Ah thx for the pointer :)

--
Sander





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Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core

2015-11-05 Thread Boris Ostrovsky 

On 11/05/2015 04:13 AM, Sander Eikelenboom wrote:


It makes "cat /sys/kernel/debug/kernel_page_tables" work and
prevents a kernel with CONFIG_DEBUG_WX=y from crashing at boot.


Great. Our nightly runs also failed spectacularly due to this bug.



It now does give a warning about an insecure W+X mapping, so 
CONFIG_DEBUG_WX=y
seems to be working. No idea how to interpret it though (and if it's a 
legit

warning).

--
Sander

[   19.034706] Freeing unused kernel memory: 1104K (822fc000 - 
8241)

[   19.041339] Write protecting the kernel read-only data: 18432k
[   19.052596] Freeing unused kernel memory: 1144K (880001ae2000 - 
880001c0)
[   19.060285] Freeing unused kernel memory: 1560K (88000207a000 - 
88000220)

[   19.067079] [ cut here ]
[   19.073931] WARNING: CPU: 5 PID: 1 at 
arch/x86/mm/dump_pagetables.c:225 note_page+0x619/0x7e0()


Yes, this apparently is a known issue: https://lkml.org/lkml/2015/11/4/476

-boris



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Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core

2015-11-04 Thread Boris Ostrovsky 

On 11/04/2015 03:02 PM, Sander Eikelenboom wrote:

On 2015-11-04 19:47, Stephen Smalley wrote:

On 11/04/2015 01:28 PM, Sander Eikelenboom wrote:

On 2015-11-04 16:52, Stephen Smalley wrote:

On 11/04/2015 06:55 AM, Sander Eikelenboom wrote:

Hi All,

I just tried to boot with the current linus mergewindow tree under 
Xen.

It fails with a kernel panic at boot with the new "CONFIG_DEBUG_WX"
option enabled.
Disabling it makes the kernel boot fine.

The splat:
[   18.424241] Freeing unused kernel memory: 1104K 
(822fc000 -

8241)
[   18.430314] Write protecting the kernel read-only data: 18432k
[   18.441054] Freeing unused kernel memory: 1144K 
(880001ae2000 -

880001c0)
[   18.447966] Freeing unused kernel memory: 1560K 
(88000207a000 -

88000220)
[   18.453947] BUG: unable to handle kernel paging request at
88055c883000
[   18.459943] IP: []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.465847] PGD 2212067 PUD 0
[   18.471564] Oops:  [#1] SMP
[   18.477248] Modules linked in:
[   18.482918] CPU: 2 PID: 1 Comm: swapper/0 Not tainted
4.3.0-mw-20151104-linus-doflr+ #1
[   18.488804] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640)  , 
BIOS

V1.8B1 09/13/2010
[   18.494778] task: 880059b9 ti: 880059b98000 task.ti:
880059b98000
[   18.500852] RIP: e030:[] []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.507102] RSP: e02b:880059b9be48  EFLAGS: 00010296
[   18.513351] RAX: 88055c883000 RBX: 81ae2000 RCX:
8800
[   18.519733] RDX: 0067 RSI: 880059b9be98 RDI:
88001000
[   18.526129] RBP: 880059b9bf00 R08:  R09:

[   18.532522] R10: 88005fd0e790 R11: 0001 R12:
88008000
[   18.538891] R13: cfff R14: 880059b9be98 R15:

[   18.545247] FS:  () GS:88005f68()
knlGS:
[   18.551708] CS:  e033 DS:  ES:  CR0: 8005003b
[   18.558153] CR2: 88055c883000 CR3: 02211000 CR4:
0660
[   18.564686] Stack:
[   18.571106]  000159b9be50 82211000 88055c884000
0800
[   18.577704]  8000 88055c883000 0007
88005fd0e790
[   18.584291]  880059b9bed8 81156ace 0001

[   18.590916] Call Trace:
[   18.597458]  [] ? free_reserved_area+0x11e/0x120
[   18.604180]  []
ptdump_walk_pgd_level_checkwx+0x12/0x20
[   18.611014]  [] mark_rodata_ro+0xe9/0xf0
[   18.617819]  [] ? rest_init+0x80/0x80
[   18.624512]  [] kernel_init+0x18/0xe0
[   18.631095]  [] ret_from_fork+0x3f/0x70
[   18.637650]  [] ? rest_init+0x80/0x80
[   18.644178] Code: 70 ff ff ff 48 3b 85 58 ff ff ff 0f 84 c0 fe 
ff ff
48 8b 85 68 ff ff ff 48 c1 e0 10 48 c1 f8 10 48 89 45 b0 48 8b 85 
70 ff
ff ff <48> 8b 38 48 85 ff 0f 85 4e ff ff ff b9 02 00 00 00 31 d2 
4c 89

[   18.658246] RIP  []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.665211]  RSP 
[   18.672073] CR2: 88055c883000
[   18.678852] ---[ end trace d84e34461c40637a ]---
[   18.685641] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x0009
[   18.685641]
[   18.699520] Kernel Offset: disable



What's your .config?  Does cat /sys/kernel/debug/kernel_page_tables
produce a similar fault even with CONFIG_DEBUG_WX=n?


.config is attached

Hmm that sysfs file doesn't seem to exist then:
# cat /sys/kernel/debug/kernel_page_tables
cat: /sys/kernel/debug/kernel_page_tables: No such file or directory


Needs CONFIG_X86_PTDUMP=y.
Also assumes you have debugfs mounted there.


Recompiled, and the result is that it also blows up:



Can you try this:


diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index 1bf417e..b534216 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -362,8 +362,13 @@ static void ptdump_walk_pgd_level_core(struct 
seq_file *m, pgd_t *pgd,

bool checkwx)
 {
 #ifdef CONFIG_X86_64
+/* 8000 - 87ff is reserved for hypervisor */
+#define is_hypervisor_range(idx)  (paravirt_enabled() && \
+  ((idx >= pgd_index(__PAGE_OFFSET) - 16) && \
+   (idx < pgd_index(__PAGE_OFFSET
 pgd_t *start = (pgd_t *) _level4_pgt;
 #else
+#define is_hypervisor_range(idx)   0
 pgd_t *start = swapper_pg_dir;
 #endif
 pgprotval_t prot;
@@ -381,7 +386,7 @@ static void ptdump_walk_pgd_level_core(struct 
seq_file *m, pgd_t *pgd,


 for (i = 0; i < PTRS_PER_PGD; i++) {
 st.current_address = normalize_addr(i * PGD_LEVEL_MULT);
-if (!pgd_none(*start)) {
+if (!pgd_none(*start) && !is_hypervisor_range(i)) {
 if (pgd_large(*start) || !pgd_present(*start)) {
 prot = pgd_flags(*start);
 note_page(m, , __pgprot(prot), 1);



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Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core

2015-11-04 Thread Sander Eikelenboom 

On 2015-11-04 19:47, Stephen Smalley wrote:

On 11/04/2015 01:28 PM, Sander Eikelenboom wrote:

On 2015-11-04 16:52, Stephen Smalley wrote:

On 11/04/2015 06:55 AM, Sander Eikelenboom wrote:

Hi All,

I just tried to boot with the current linus mergewindow tree under 
Xen.

It fails with a kernel panic at boot with the new "CONFIG_DEBUG_WX"
option enabled.
Disabling it makes the kernel boot fine.

The splat:
[   18.424241] Freeing unused kernel memory: 1104K (822fc000 
-

8241)
[   18.430314] Write protecting the kernel read-only data: 18432k
[   18.441054] Freeing unused kernel memory: 1144K (880001ae2000 
-

880001c0)
[   18.447966] Freeing unused kernel memory: 1560K (88000207a000 
-

88000220)
[   18.453947] BUG: unable to handle kernel paging request at
88055c883000
[   18.459943] IP: []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.465847] PGD 2212067 PUD 0
[   18.471564] Oops:  [#1] SMP
[   18.477248] Modules linked in:
[   18.482918] CPU: 2 PID: 1 Comm: swapper/0 Not tainted
4.3.0-mw-20151104-linus-doflr+ #1
[   18.488804] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640)  , 
BIOS

V1.8B1 09/13/2010
[   18.494778] task: 880059b9 ti: 880059b98000 task.ti:
880059b98000
[   18.500852] RIP: e030:[]  []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.507102] RSP: e02b:880059b9be48  EFLAGS: 00010296
[   18.513351] RAX: 88055c883000 RBX: 81ae2000 RCX:
8800
[   18.519733] RDX: 0067 RSI: 880059b9be98 RDI:
88001000
[   18.526129] RBP: 880059b9bf00 R08:  R09:

[   18.532522] R10: 88005fd0e790 R11: 0001 R12:
88008000
[   18.538891] R13: cfff R14: 880059b9be98 R15:

[   18.545247] FS:  () GS:88005f68()
knlGS:
[   18.551708] CS:  e033 DS:  ES:  CR0: 8005003b
[   18.558153] CR2: 88055c883000 CR3: 02211000 CR4:
0660
[   18.564686] Stack:
[   18.571106]  000159b9be50 82211000 88055c884000
0800
[   18.577704]  8000 88055c883000 0007
88005fd0e790
[   18.584291]  880059b9bed8 81156ace 0001

[   18.590916] Call Trace:
[   18.597458]  [] ? 
free_reserved_area+0x11e/0x120

[   18.604180]  []
ptdump_walk_pgd_level_checkwx+0x12/0x20
[   18.611014]  [] mark_rodata_ro+0xe9/0xf0
[   18.617819]  [] ? rest_init+0x80/0x80
[   18.624512]  [] kernel_init+0x18/0xe0
[   18.631095]  [] ret_from_fork+0x3f/0x70
[   18.637650]  [] ? rest_init+0x80/0x80
[   18.644178] Code: 70 ff ff ff 48 3b 85 58 ff ff ff 0f 84 c0 fe ff 
ff
48 8b 85 68 ff ff ff 48 c1 e0 10 48 c1 f8 10 48 89 45 b0 48 8b 85 70 
ff
ff ff <48> 8b 38 48 85 ff 0f 85 4e ff ff ff b9 02 00 00 00 31 d2 4c 
89

[   18.658246] RIP  []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.665211]  RSP 
[   18.672073] CR2: 88055c883000
[   18.678852] ---[ end trace d84e34461c40637a ]---
[   18.685641] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x0009
[   18.685641]
[   18.699520] Kernel Offset: disable



What's your .config?  Does cat /sys/kernel/debug/kernel_page_tables
produce a similar fault even with CONFIG_DEBUG_WX=n?


.config is attached

Hmm that sysfs file doesn't seem to exist then:
# cat /sys/kernel/debug/kernel_page_tables
cat: /sys/kernel/debug/kernel_page_tables: No such file or directory


Needs CONFIG_X86_PTDUMP=y.
Also assumes you have debugfs mounted there.


Recompiled, and the result is that it also blows up:
[  902.389247] BUG: unable to handle kernel paging request at 
88055c883000
[  902.402749] IP: [] 
ptdump_walk_pgd_level_core+0x20e/0x440

[  902.416261] PGD 2212067 PUD 0
[  902.427768] Oops:  [#1] SMP
[  902.438137] Modules linked in:
[  902.448299] CPU: 2 PID: 21951 Comm: cat Not tainted 
4.3.0-mw-20151104-linus-doflr-nodebugwx-withptdump+ #1
[  902.458581] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640)  , BIOS 
V1.8B1 09/13/2010
[  902.468850] task: 88004b49e300 ti: 88005928c000 task.ti: 
88005928c000
[  902.479133] RIP: e030:[]  [] 
ptdump_walk_pgd_level_core+0x20e/0x440

[  902.489536] RSP: e02b:88005928fd20  EFLAGS: 00010296
[  902.499692] RAX: 88055c883000 RBX:  RCX: 
8800
[  902.509755] RDX: 0067 RSI: 88005928fd70 RDI: 
88001000
[  902.519680] RBP: 88005928fdd8 R08: 1000 R09: 

[  902.529555] R10:  R11: 0246 R12: 
88005928ff20
[  902.539349] R13: cfff R14: 88005928fd70 R15: 
880033c773c0
[  902.549081] FS:  7f56b07d4700() GS:88005f68() 
knlGS:

[  902.558690] CS:  e033 DS:  ES:  CR0: 8005003b
[  902.568111] CR2: 88055c883000 CR3: 4563f000 CR4: 
0660

[  902.577508] Stack:
[  902.586741]

Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core

2015-11-04 Thread Boris Ostrovsky 

On 11/04/2015 01:47 PM, Stephen Smalley wrote:

On 11/04/2015 01:28 PM, Sander Eikelenboom wrote:

On 2015-11-04 16:52, Stephen Smalley wrote:

On 11/04/2015 06:55 AM, Sander Eikelenboom wrote:

Hi All,

I just tried to boot with the current linus mergewindow tree under 
Xen.

It fails with a kernel panic at boot with the new "CONFIG_DEBUG_WX"
option enabled.
Disabling it makes the kernel boot fine.

The splat:
[   18.424241] Freeing unused kernel memory: 1104K (822fc000 -
8241)
[   18.430314] Write protecting the kernel read-only data: 18432k
[   18.441054] Freeing unused kernel memory: 1144K (880001ae2000 -
880001c0)
[   18.447966] Freeing unused kernel memory: 1560K (88000207a000 -
88000220)
[   18.453947] BUG: unable to handle kernel paging request at
88055c883000
[   18.459943] IP: []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.465847] PGD 2212067 PUD 0
[   18.471564] Oops:  [#1] SMP
[   18.477248] Modules linked in:
[   18.482918] CPU: 2 PID: 1 Comm: swapper/0 Not tainted
4.3.0-mw-20151104-linus-doflr+ #1
[   18.488804] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640)  , 
BIOS

V1.8B1 09/13/2010
[   18.494778] task: 880059b9 ti: 880059b98000 task.ti:
880059b98000
[   18.500852] RIP: e030:[] []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.507102] RSP: e02b:880059b9be48  EFLAGS: 00010296
[   18.513351] RAX: 88055c883000 RBX: 81ae2000 RCX:
8800
[   18.519733] RDX: 0067 RSI: 880059b9be98 RDI:
88001000
[   18.526129] RBP: 880059b9bf00 R08:  R09:

[   18.532522] R10: 88005fd0e790 R11: 0001 R12:
88008000
[   18.538891] R13: cfff R14: 880059b9be98 R15:

[   18.545247] FS:  () GS:88005f68()
knlGS:
[   18.551708] CS:  e033 DS:  ES:  CR0: 8005003b
[   18.558153] CR2: 88055c883000 CR3: 02211000 CR4:
0660
[   18.564686] Stack:
[   18.571106]  000159b9be50 82211000 88055c884000
0800
[   18.577704]  8000 88055c883000 0007
88005fd0e790
[   18.584291]  880059b9bed8 81156ace 0001

[   18.590916] Call Trace:
[   18.597458]  [] ? free_reserved_area+0x11e/0x120
[   18.604180]  []
ptdump_walk_pgd_level_checkwx+0x12/0x20
[   18.611014]  [] mark_rodata_ro+0xe9/0xf0
[   18.617819]  [] ? rest_init+0x80/0x80
[   18.624512]  [] kernel_init+0x18/0xe0
[   18.631095]  [] ret_from_fork+0x3f/0x70
[   18.637650]  [] ? rest_init+0x80/0x80
[   18.644178] Code: 70 ff ff ff 48 3b 85 58 ff ff ff 0f 84 c0 fe 
ff ff
48 8b 85 68 ff ff ff 48 c1 e0 10 48 c1 f8 10 48 89 45 b0 48 8b 85 
70 ff

ff ff <48> 8b 38 48 85 ff 0f 85 4e ff ff ff b9 02 00 00 00 31 d2 4c 89
[   18.658246] RIP  []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.665211]  RSP 
[   18.672073] CR2: 88055c883000
[   18.678852] ---[ end trace d84e34461c40637a ]---
[   18.685641] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x0009
[   18.685641]
[   18.699520] Kernel Offset: disable



What's your .config?  Does cat /sys/kernel/debug/kernel_page_tables
produce a similar fault even with CONFIG_DEBUG_WX=n?


.config is attached

Hmm that sysfs file doesn't seem to exist then:
# cat /sys/kernel/debug/kernel_page_tables
cat: /sys/kernel/debug/kernel_page_tables: No such file or directory


Needs CONFIG_X86_PTDUMP=y.
Also assumes you have debugfs mounted there.



I don't think this code (including original page tables dump) can work 
on Xen PV guests: we are walking full PGD, including the hypervisor hole 
(entries 256-272).


-boris


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[Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core

2015-11-04 Thread Sander Eikelenboom 

Hi All,

I just tried to boot with the current linus mergewindow tree under Xen.
It fails with a kernel panic at boot with the new "CONFIG_DEBUG_WX" 
option enabled.

Disabling it makes the kernel boot fine.

The splat:
[   18.424241] Freeing unused kernel memory: 1104K (822fc000 - 
8241)

[   18.430314] Write protecting the kernel read-only data: 18432k
[   18.441054] Freeing unused kernel memory: 1144K (880001ae2000 - 
880001c0)
[   18.447966] Freeing unused kernel memory: 1560K (88000207a000 - 
88000220)
[   18.453947] BUG: unable to handle kernel paging request at 
88055c883000
[   18.459943] IP: [] 
ptdump_walk_pgd_level_core+0x20e/0x440

[   18.465847] PGD 2212067 PUD 0
[   18.471564] Oops:  [#1] SMP
[   18.477248] Modules linked in:
[   18.482918] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 
4.3.0-mw-20151104-linus-doflr+ #1
[   18.488804] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640)  , BIOS 
V1.8B1 09/13/2010
[   18.494778] task: 880059b9 ti: 880059b98000 task.ti: 
880059b98000
[   18.500852] RIP: e030:[]  [] 
ptdump_walk_pgd_level_core+0x20e/0x440

[   18.507102] RSP: e02b:880059b9be48  EFLAGS: 00010296
[   18.513351] RAX: 88055c883000 RBX: 81ae2000 RCX: 
8800
[   18.519733] RDX: 0067 RSI: 880059b9be98 RDI: 
88001000
[   18.526129] RBP: 880059b9bf00 R08:  R09: 

[   18.532522] R10: 88005fd0e790 R11: 0001 R12: 
88008000
[   18.538891] R13: cfff R14: 880059b9be98 R15: 

[   18.545247] FS:  () GS:88005f68() 
knlGS:

[   18.551708] CS:  e033 DS:  ES:  CR0: 8005003b
[   18.558153] CR2: 88055c883000 CR3: 02211000 CR4: 
0660

[   18.564686] Stack:
[   18.571106]  000159b9be50 82211000 88055c884000 
0800
[   18.577704]  8000 88055c883000 0007 
88005fd0e790
[   18.584291]  880059b9bed8 81156ace 0001 


[   18.590916] Call Trace:
[   18.597458]  [] ? free_reserved_area+0x11e/0x120
[   18.604180]  [] 
ptdump_walk_pgd_level_checkwx+0x12/0x20

[   18.611014]  [] mark_rodata_ro+0xe9/0xf0
[   18.617819]  [] ? rest_init+0x80/0x80
[   18.624512]  [] kernel_init+0x18/0xe0
[   18.631095]  [] ret_from_fork+0x3f/0x70
[   18.637650]  [] ? rest_init+0x80/0x80
[   18.644178] Code: 70 ff ff ff 48 3b 85 58 ff ff ff 0f 84 c0 fe ff ff 
48 8b 85 68 ff ff ff 48 c1 e0 10 48 c1 f8 10 48 89 45 b0 48 8b 85 70 ff 
ff ff <48> 8b 38 48 85 ff 0f 85 4e ff ff ff b9 02 00 00 00 31 d2 4c 89
[   18.658246] RIP  [] 
ptdump_walk_pgd_level_core+0x20e/0x440

[   18.665211]  RSP 
[   18.672073] CR2: 88055c883000
[   18.678852] ---[ end trace d84e34461c40637a ]---
[   18.685641] Kernel panic - not syncing: Attempted to kill init! 
exitcode=0x0009

[   18.685641]
[   18.699520] Kernel Offset: disable


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Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core

2015-11-04 Thread Stephen Smalley 

On 11/04/2015 06:55 AM, Sander Eikelenboom wrote:

Hi All,

I just tried to boot with the current linus mergewindow tree under Xen.
It fails with a kernel panic at boot with the new "CONFIG_DEBUG_WX"
option enabled.
Disabling it makes the kernel boot fine.

The splat:
[   18.424241] Freeing unused kernel memory: 1104K (822fc000 -
8241)
[   18.430314] Write protecting the kernel read-only data: 18432k
[   18.441054] Freeing unused kernel memory: 1144K (880001ae2000 -
880001c0)
[   18.447966] Freeing unused kernel memory: 1560K (88000207a000 -
88000220)
[   18.453947] BUG: unable to handle kernel paging request at
88055c883000
[   18.459943] IP: []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.465847] PGD 2212067 PUD 0
[   18.471564] Oops:  [#1] SMP
[   18.477248] Modules linked in:
[   18.482918] CPU: 2 PID: 1 Comm: swapper/0 Not tainted
4.3.0-mw-20151104-linus-doflr+ #1
[   18.488804] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640)  , BIOS
V1.8B1 09/13/2010
[   18.494778] task: 880059b9 ti: 880059b98000 task.ti:
880059b98000
[   18.500852] RIP: e030:[]  []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.507102] RSP: e02b:880059b9be48  EFLAGS: 00010296
[   18.513351] RAX: 88055c883000 RBX: 81ae2000 RCX:
8800
[   18.519733] RDX: 0067 RSI: 880059b9be98 RDI:
88001000
[   18.526129] RBP: 880059b9bf00 R08:  R09:

[   18.532522] R10: 88005fd0e790 R11: 0001 R12:
88008000
[   18.538891] R13: cfff R14: 880059b9be98 R15:

[   18.545247] FS:  () GS:88005f68()
knlGS:
[   18.551708] CS:  e033 DS:  ES:  CR0: 8005003b
[   18.558153] CR2: 88055c883000 CR3: 02211000 CR4:
0660
[   18.564686] Stack:
[   18.571106]  000159b9be50 82211000 88055c884000
0800
[   18.577704]  8000 88055c883000 0007
88005fd0e790
[   18.584291]  880059b9bed8 81156ace 0001

[   18.590916] Call Trace:
[   18.597458]  [] ? free_reserved_area+0x11e/0x120
[   18.604180]  []
ptdump_walk_pgd_level_checkwx+0x12/0x20
[   18.611014]  [] mark_rodata_ro+0xe9/0xf0
[   18.617819]  [] ? rest_init+0x80/0x80
[   18.624512]  [] kernel_init+0x18/0xe0
[   18.631095]  [] ret_from_fork+0x3f/0x70
[   18.637650]  [] ? rest_init+0x80/0x80
[   18.644178] Code: 70 ff ff ff 48 3b 85 58 ff ff ff 0f 84 c0 fe ff ff
48 8b 85 68 ff ff ff 48 c1 e0 10 48 c1 f8 10 48 89 45 b0 48 8b 85 70 ff
ff ff <48> 8b 38 48 85 ff 0f 85 4e ff ff ff b9 02 00 00 00 31 d2 4c 89
[   18.658246] RIP  []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.665211]  RSP 
[   18.672073] CR2: 88055c883000
[   18.678852] ---[ end trace d84e34461c40637a ]---
[   18.685641] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x0009
[   18.685641]
[   18.699520] Kernel Offset: disable



What's your .config?  Does cat /sys/kernel/debug/kernel_page_tables 
produce a similar fault even with CONFIG_DEBUG_WX=n?


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Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core

2015-11-04 Thread Sander Eikelenboom 

On 2015-11-04 19:06, Ingo Molnar wrote:

* Stephen Smalley  wrote:


On 11/04/2015 06:55 AM, Sander Eikelenboom wrote:
>Hi All,
>
>I just tried to boot with the current linus mergewindow tree under Xen.
>It fails with a kernel panic at boot with the new "CONFIG_DEBUG_WX"
>option enabled.
>Disabling it makes the kernel boot fine.
>
>The splat:
>[   18.424241] Freeing unused kernel memory: 1104K (822fc000 -
>8241)
>[   18.430314] Write protecting the kernel read-only data: 18432k
>[   18.441054] Freeing unused kernel memory: 1144K (880001ae2000 -
>880001c0)
>[   18.447966] Freeing unused kernel memory: 1560K (88000207a000 -
>88000220)
>[   18.453947] BUG: unable to handle kernel paging request at
>88055c883000
>[   18.459943] IP: []
>ptdump_walk_pgd_level_core+0x20e/0x440
>[   18.465847] PGD 2212067 PUD 0
>[   18.471564] Oops:  [#1] SMP
>[   18.477248] Modules linked in:
>[   18.482918] CPU: 2 PID: 1 Comm: swapper/0 Not tainted
>4.3.0-mw-20151104-linus-doflr+ #1
>[   18.488804] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640)  , BIOS
>V1.8B1 09/13/2010
>[   18.494778] task: 880059b9 ti: 880059b98000 task.ti:
>880059b98000
>[   18.500852] RIP: e030:[]  []
>ptdump_walk_pgd_level_core+0x20e/0x440


It would be nice to see which line of code this corresponds to. Doing 
this:


  gdb vmlinux
  list *0x8105af8e

should normally do the trick.

Thanks,

Ingo


Hi Ingo,

(gdb) list *0x8105af8e
0x8105af8e is in ptdump_walk_pgd_level_core 
(arch/x86/mm/dump_pagetables.c:181).

warning: Source file is more recent than executable.
176  * On 64 bits, sign-extend the 48 bit address to 64 bit
177  */
178 static unsigned long normalize_addr(unsigned long u)
179 {
180 #ifdef CONFIG_X86_64
181 return (signed long)(u << 16) >> 16;
182 #else
183 return u;
184 #endif
185 }

--
Sander



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Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core

2015-11-04 Thread Stephen Smalley 

On 11/04/2015 01:28 PM, Sander Eikelenboom wrote:

On 2015-11-04 16:52, Stephen Smalley wrote:

On 11/04/2015 06:55 AM, Sander Eikelenboom wrote:

Hi All,

I just tried to boot with the current linus mergewindow tree under Xen.
It fails with a kernel panic at boot with the new "CONFIG_DEBUG_WX"
option enabled.
Disabling it makes the kernel boot fine.

The splat:
[   18.424241] Freeing unused kernel memory: 1104K (822fc000 -
8241)
[   18.430314] Write protecting the kernel read-only data: 18432k
[   18.441054] Freeing unused kernel memory: 1144K (880001ae2000 -
880001c0)
[   18.447966] Freeing unused kernel memory: 1560K (88000207a000 -
88000220)
[   18.453947] BUG: unable to handle kernel paging request at
88055c883000
[   18.459943] IP: []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.465847] PGD 2212067 PUD 0
[   18.471564] Oops:  [#1] SMP
[   18.477248] Modules linked in:
[   18.482918] CPU: 2 PID: 1 Comm: swapper/0 Not tainted
4.3.0-mw-20151104-linus-doflr+ #1
[   18.488804] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640)  , BIOS
V1.8B1 09/13/2010
[   18.494778] task: 880059b9 ti: 880059b98000 task.ti:
880059b98000
[   18.500852] RIP: e030:[]  []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.507102] RSP: e02b:880059b9be48  EFLAGS: 00010296
[   18.513351] RAX: 88055c883000 RBX: 81ae2000 RCX:
8800
[   18.519733] RDX: 0067 RSI: 880059b9be98 RDI:
88001000
[   18.526129] RBP: 880059b9bf00 R08:  R09:

[   18.532522] R10: 88005fd0e790 R11: 0001 R12:
88008000
[   18.538891] R13: cfff R14: 880059b9be98 R15:

[   18.545247] FS:  () GS:88005f68()
knlGS:
[   18.551708] CS:  e033 DS:  ES:  CR0: 8005003b
[   18.558153] CR2: 88055c883000 CR3: 02211000 CR4:
0660
[   18.564686] Stack:
[   18.571106]  000159b9be50 82211000 88055c884000
0800
[   18.577704]  8000 88055c883000 0007
88005fd0e790
[   18.584291]  880059b9bed8 81156ace 0001

[   18.590916] Call Trace:
[   18.597458]  [] ? free_reserved_area+0x11e/0x120
[   18.604180]  []
ptdump_walk_pgd_level_checkwx+0x12/0x20
[   18.611014]  [] mark_rodata_ro+0xe9/0xf0
[   18.617819]  [] ? rest_init+0x80/0x80
[   18.624512]  [] kernel_init+0x18/0xe0
[   18.631095]  [] ret_from_fork+0x3f/0x70
[   18.637650]  [] ? rest_init+0x80/0x80
[   18.644178] Code: 70 ff ff ff 48 3b 85 58 ff ff ff 0f 84 c0 fe ff ff
48 8b 85 68 ff ff ff 48 c1 e0 10 48 c1 f8 10 48 89 45 b0 48 8b 85 70 ff
ff ff <48> 8b 38 48 85 ff 0f 85 4e ff ff ff b9 02 00 00 00 31 d2 4c 89
[   18.658246] RIP  []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.665211]  RSP 
[   18.672073] CR2: 88055c883000
[   18.678852] ---[ end trace d84e34461c40637a ]---
[   18.685641] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x0009
[   18.685641]
[   18.699520] Kernel Offset: disable



What's your .config?  Does cat /sys/kernel/debug/kernel_page_tables
produce a similar fault even with CONFIG_DEBUG_WX=n?


.config is attached

Hmm that sysfs file doesn't seem to exist then:
# cat /sys/kernel/debug/kernel_page_tables
cat: /sys/kernel/debug/kernel_page_tables: No such file or directory


Needs CONFIG_X86_PTDUMP=y.
Also assumes you have debugfs mounted there.



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Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core

2015-11-04 Thread Ingo Molnar 

* Stephen Smalley  wrote:

> On 11/04/2015 06:55 AM, Sander Eikelenboom wrote:
> >Hi All,
> >
> >I just tried to boot with the current linus mergewindow tree under Xen.
> >It fails with a kernel panic at boot with the new "CONFIG_DEBUG_WX"
> >option enabled.
> >Disabling it makes the kernel boot fine.
> >
> >The splat:
> >[   18.424241] Freeing unused kernel memory: 1104K (822fc000 -
> >8241)
> >[   18.430314] Write protecting the kernel read-only data: 18432k
> >[   18.441054] Freeing unused kernel memory: 1144K (880001ae2000 -
> >880001c0)
> >[   18.447966] Freeing unused kernel memory: 1560K (88000207a000 -
> >88000220)
> >[   18.453947] BUG: unable to handle kernel paging request at
> >88055c883000
> >[   18.459943] IP: []
> >ptdump_walk_pgd_level_core+0x20e/0x440
> >[   18.465847] PGD 2212067 PUD 0
> >[   18.471564] Oops:  [#1] SMP
> >[   18.477248] Modules linked in:
> >[   18.482918] CPU: 2 PID: 1 Comm: swapper/0 Not tainted
> >4.3.0-mw-20151104-linus-doflr+ #1
> >[   18.488804] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640)  , BIOS
> >V1.8B1 09/13/2010
> >[   18.494778] task: 880059b9 ti: 880059b98000 task.ti:
> >880059b98000
> >[   18.500852] RIP: e030:[]  []
> >ptdump_walk_pgd_level_core+0x20e/0x440

It would be nice to see which line of code this corresponds to. Doing this:

  gdb vmlinux
  list *0x8105af8e

should normally do the trick.

Thanks,

Ingo

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Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core

2015-11-04 Thread Sander Eikelenboom 

On 2015-11-04 16:52, Stephen Smalley wrote:

On 11/04/2015 06:55 AM, Sander Eikelenboom wrote:

Hi All,

I just tried to boot with the current linus mergewindow tree under 
Xen.

It fails with a kernel panic at boot with the new "CONFIG_DEBUG_WX"
option enabled.
Disabling it makes the kernel boot fine.

The splat:
[   18.424241] Freeing unused kernel memory: 1104K (822fc000 -
8241)
[   18.430314] Write protecting the kernel read-only data: 18432k
[   18.441054] Freeing unused kernel memory: 1144K (880001ae2000 -
880001c0)
[   18.447966] Freeing unused kernel memory: 1560K (88000207a000 -
88000220)
[   18.453947] BUG: unable to handle kernel paging request at
88055c883000
[   18.459943] IP: []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.465847] PGD 2212067 PUD 0
[   18.471564] Oops:  [#1] SMP
[   18.477248] Modules linked in:
[   18.482918] CPU: 2 PID: 1 Comm: swapper/0 Not tainted
4.3.0-mw-20151104-linus-doflr+ #1
[   18.488804] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640)  , 
BIOS

V1.8B1 09/13/2010
[   18.494778] task: 880059b9 ti: 880059b98000 task.ti:
880059b98000
[   18.500852] RIP: e030:[]  []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.507102] RSP: e02b:880059b9be48  EFLAGS: 00010296
[   18.513351] RAX: 88055c883000 RBX: 81ae2000 RCX:
8800
[   18.519733] RDX: 0067 RSI: 880059b9be98 RDI:
88001000
[   18.526129] RBP: 880059b9bf00 R08:  R09:

[   18.532522] R10: 88005fd0e790 R11: 0001 R12:
88008000
[   18.538891] R13: cfff R14: 880059b9be98 R15:

[   18.545247] FS:  () GS:88005f68()
knlGS:
[   18.551708] CS:  e033 DS:  ES:  CR0: 8005003b
[   18.558153] CR2: 88055c883000 CR3: 02211000 CR4:
0660
[   18.564686] Stack:
[   18.571106]  000159b9be50 82211000 88055c884000
0800
[   18.577704]  8000 88055c883000 0007
88005fd0e790
[   18.584291]  880059b9bed8 81156ace 0001

[   18.590916] Call Trace:
[   18.597458]  [] ? free_reserved_area+0x11e/0x120
[   18.604180]  []
ptdump_walk_pgd_level_checkwx+0x12/0x20
[   18.611014]  [] mark_rodata_ro+0xe9/0xf0
[   18.617819]  [] ? rest_init+0x80/0x80
[   18.624512]  [] kernel_init+0x18/0xe0
[   18.631095]  [] ret_from_fork+0x3f/0x70
[   18.637650]  [] ? rest_init+0x80/0x80
[   18.644178] Code: 70 ff ff ff 48 3b 85 58 ff ff ff 0f 84 c0 fe ff 
ff
48 8b 85 68 ff ff ff 48 c1 e0 10 48 c1 f8 10 48 89 45 b0 48 8b 85 70 
ff

ff ff <48> 8b 38 48 85 ff 0f 85 4e ff ff ff b9 02 00 00 00 31 d2 4c 89
[   18.658246] RIP  []
ptdump_walk_pgd_level_core+0x20e/0x440
[   18.665211]  RSP 
[   18.672073] CR2: 88055c883000
[   18.678852] ---[ end trace d84e34461c40637a ]---
[   18.685641] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x0009
[   18.685641]
[   18.699520] Kernel Offset: disable



What's your .config?  Does cat /sys/kernel/debug/kernel_page_tables
produce a similar fault even with CONFIG_DEBUG_WX=n?


.config is attached

Hmm that sysfs file doesn't seem to exist then:
# cat /sys/kernel/debug/kernel_page_tables
cat: /sys/kernel/debug/kernel_page_tables: No such file or directory

--
Sander
#
# Automatically generated file; DO NOT EDIT.
# Linux/x86_64 4.3.0-mw-20151104-linus-doflr Kernel Configuration
#
CONFIG_64BIT=y
CONFIG_X86_64=y
CONFIG_X86=y
CONFIG_INSTRUCTION_DECODER=y
CONFIG_PERF_EVENTS_INTEL_UNCORE=y
CONFIG_OUTPUT_FORMAT="elf64-x86-64"
CONFIG_ARCH_DEFCONFIG="arch/x86/configs/x86_64_defconfig"
CONFIG_LOCKDEP_SUPPORT=y
CONFIG_STACKTRACE_SUPPORT=y
CONFIG_HAVE_LATENCYTOP_SUPPORT=y
CONFIG_MMU=y
CONFIG_NEED_DMA_MAP_STATE=y
CONFIG_NEED_SG_DMA_LENGTH=y
CONFIG_GENERIC_ISA_DMA=y
CONFIG_GENERIC_BUG=y
CONFIG_GENERIC_BUG_RELATIVE_POINTERS=y
CONFIG_GENERIC_HWEIGHT=y
CONFIG_ARCH_MAY_HAVE_PC_FDC=y
CONFIG_RWSEM_XCHGADD_ALGORITHM=y
CONFIG_GENERIC_CALIBRATE_DELAY=y
CONFIG_ARCH_HAS_CPU_RELAX=y
CONFIG_ARCH_HAS_CACHE_LINE_SIZE=y
CONFIG_HAVE_SETUP_PER_CPU_AREA=y
CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK=y
CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK=y
CONFIG_ARCH_HIBERNATION_POSSIBLE=y
CONFIG_ARCH_SUSPEND_POSSIBLE=y
CONFIG_ARCH_WANT_HUGE_PMD_SHARE=y
CONFIG_ARCH_WANT_GENERAL_HUGETLB=y
CONFIG_ZONE_DMA32=y
CONFIG_AUDIT_ARCH=y
CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING=y
CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC=y
CONFIG_X86_64_SMP=y
CONFIG_ARCH_HWEIGHT_CFLAGS="-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx 
-fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10 
-fcall-saved-r11"
CONFIG_ARCH_SUPPORTS_UPROBES=y
CONFIG_FIX_EARLYCON_MEM=y
CONFIG_PGTABLE_LEVELS=4
CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"
CONFIG_IRQ_WORK=y
CONFIG_BUILDTIME_EXTABLE_SORT=y

#
# General setup
#
CONFIG_INIT_ENV_ARG_LIMIT=32
CONFIG_CROSS_COMPILE=""
# CONFIG_COMPILE_TEST is not set