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| Started by | Sander Eikelenboom <linux@eikelenboom.it> |
|---|---|
| First post | 2015-11-04 13:10 +0100 |
| Last post | 2015-11-04 21:20 +0100 |
| Articles | 11 — 4 participants |
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Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core Sander Eikelenboom <linux@eikelenboom.it> - 2015-11-04 13:10 +0100
Re: Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core Stephen Smalley <sds@tycho.nsa.gov> - 2015-11-04 17:00 +0100
Re: Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core Ingo Molnar <mingo@kernel.org> - 2015-11-04 19:10 +0100
Re: Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core Sander Eikelenboom <linux@eikelenboom.it> - 2015-11-04 19:20 +0100
Re: Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core Stephen Smalley <sds@tycho.nsa.gov> - 2015-11-04 19:50 +0100
Re: Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core Sander Eikelenboom <linux@eikelenboom.it> - 2015-11-04 21:10 +0100
Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2015-11-05 00:20 +0100
Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core Sander Eikelenboom <linux@eikelenboom.it> - 2015-11-05 10:20 +0100
Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2015-11-05 15:00 +0100
Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core Sander Eikelenboom <linux@eikelenboom.it> - 2015-11-05 15:10 +0100
Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2015-11-04 21:20 +0100
| From | Sander Eikelenboom <linux@eikelenboom.it> |
|---|---|
| Date | 2015-11-04 13:10 +0100 |
| Subject | Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core |
| Message-ID | <qr535-eP-31@gated-at.bofh.it> |
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 (ffffffff822fc000 - ffffffff82410000) [ 18.430314] Write protecting the kernel read-only data: 18432k [ 18.441054] Freeing unused kernel memory: 1144K (ffff880001ae2000 - ffff880001c00000) [ 18.447966] Freeing unused kernel memory: 1560K (ffff88000207a000 - ffff880002200000) [ 18.453947] BUG: unable to handle kernel paging request at ffff88055c883000 [ 18.459943] IP: [<ffffffff8105af8e>] ptdump_walk_pgd_level_core+0x20e/0x440 [ 18.465847] PGD 2212067 PUD 0 [ 18.471564] Oops: 0000 [#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: ffff880059b90000 ti: ffff880059b98000 task.ti: ffff880059b98000 [ 18.500852] RIP: e030:[<ffffffff8105af8e>] [<ffffffff8105af8e>] ptdump_walk_pgd_level_core+0x20e/0x440 [ 18.507102] RSP: e02b:ffff880059b9be48 EFLAGS: 00010296 [ 18.513351] RAX: ffff88055c883000 RBX: ffffffff81ae2000 RCX: ffff880000000000 [ 18.519733] RDX: 0000000000000067 RSI: ffff880059b9be98 RDI: ffff880000001000 [ 18.526129] RBP: ffff880059b9bf00 R08: 0000000000000000 R09: 0000000000000000 [ 18.532522] R10: ffff88005fd0e790 R11: 0000000000000001 R12: ffff880080000000 [ 18.538891] R13: ffffc00000000fff R14: ffff880059b9be98 R15: 0000000000000000 [ 18.545247] FS: 0000000000000000(0000) GS:ffff88005f680000(0000) knlGS:0000000000000000 [ 18.551708] CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b [ 18.558153] CR2: ffff88055c883000 CR3: 0000000002211000 CR4: 0000000000000660 [ 18.564686] Stack: [ 18.571106] 0000000159b9be50 ffffffff82211000 ffff88055c884000 0000000000000800 [ 18.577704] 0000800000000000 ffff88055c883000 0000000000000007 ffff88005fd0e790 [ 18.584291] ffff880059b9bed8 ffffffff81156ace 0000000000000001 0000000000000000 [ 18.590916] Call Trace: [ 18.597458] [<ffffffff81156ace>] ? free_reserved_area+0x11e/0x120 [ 18.604180] [<ffffffff8105b1e2>] ptdump_walk_pgd_level_checkwx+0x12/0x20 [ 18.611014] [<ffffffff810515b9>] mark_rodata_ro+0xe9/0xf0 [ 18.617819] [<ffffffff81ad3380>] ? rest_init+0x80/0x80 [ 18.624512] [<ffffffff81ad3398>] kernel_init+0x18/0xe0 [ 18.631095] [<ffffffff81adadcf>] ret_from_fork+0x3f/0x70 [ 18.637650] [<ffffffff81ad3380>] ? 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 [<ffffffff8105af8e>] ptdump_walk_pgd_level_core+0x20e/0x440 [ 18.665211] RSP <ffff880059b9be48> [ 18.672073] CR2: ffff88055c883000 [ 18.678852] ---[ end trace d84e34461c40637a ]--- [ 18.685641] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009 [ 18.685641] [ 18.699520] Kernel Offset: disable -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Stephen Smalley <sds@tycho.nsa.gov> |
|---|---|
| Date | 2015-11-04 17:00 +0100 |
| Subject | Re: Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core |
| Message-ID | <qr8DD-2nj-1@gated-at.bofh.it> |
| In reply to | #1262241 |
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 (ffffffff822fc000 - > ffffffff82410000) > [ 18.430314] Write protecting the kernel read-only data: 18432k > [ 18.441054] Freeing unused kernel memory: 1144K (ffff880001ae2000 - > ffff880001c00000) > [ 18.447966] Freeing unused kernel memory: 1560K (ffff88000207a000 - > ffff880002200000) > [ 18.453947] BUG: unable to handle kernel paging request at > ffff88055c883000 > [ 18.459943] IP: [<ffffffff8105af8e>] > ptdump_walk_pgd_level_core+0x20e/0x440 > [ 18.465847] PGD 2212067 PUD 0 > [ 18.471564] Oops: 0000 [#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: ffff880059b90000 ti: ffff880059b98000 task.ti: > ffff880059b98000 > [ 18.500852] RIP: e030:[<ffffffff8105af8e>] [<ffffffff8105af8e>] > ptdump_walk_pgd_level_core+0x20e/0x440 > [ 18.507102] RSP: e02b:ffff880059b9be48 EFLAGS: 00010296 > [ 18.513351] RAX: ffff88055c883000 RBX: ffffffff81ae2000 RCX: > ffff880000000000 > [ 18.519733] RDX: 0000000000000067 RSI: ffff880059b9be98 RDI: > ffff880000001000 > [ 18.526129] RBP: ffff880059b9bf00 R08: 0000000000000000 R09: > 0000000000000000 > [ 18.532522] R10: ffff88005fd0e790 R11: 0000000000000001 R12: > ffff880080000000 > [ 18.538891] R13: ffffc00000000fff R14: ffff880059b9be98 R15: > 0000000000000000 > [ 18.545247] FS: 0000000000000000(0000) GS:ffff88005f680000(0000) > knlGS:0000000000000000 > [ 18.551708] CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b > [ 18.558153] CR2: ffff88055c883000 CR3: 0000000002211000 CR4: > 0000000000000660 > [ 18.564686] Stack: > [ 18.571106] 0000000159b9be50 ffffffff82211000 ffff88055c884000 > 0000000000000800 > [ 18.577704] 0000800000000000 ffff88055c883000 0000000000000007 > ffff88005fd0e790 > [ 18.584291] ffff880059b9bed8 ffffffff81156ace 0000000000000001 > 0000000000000000 > [ 18.590916] Call Trace: > [ 18.597458] [<ffffffff81156ace>] ? free_reserved_area+0x11e/0x120 > [ 18.604180] [<ffffffff8105b1e2>] > ptdump_walk_pgd_level_checkwx+0x12/0x20 > [ 18.611014] [<ffffffff810515b9>] mark_rodata_ro+0xe9/0xf0 > [ 18.617819] [<ffffffff81ad3380>] ? rest_init+0x80/0x80 > [ 18.624512] [<ffffffff81ad3398>] kernel_init+0x18/0xe0 > [ 18.631095] [<ffffffff81adadcf>] ret_from_fork+0x3f/0x70 > [ 18.637650] [<ffffffff81ad3380>] ? 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 [<ffffffff8105af8e>] > ptdump_walk_pgd_level_core+0x20e/0x440 > [ 18.665211] RSP <ffff880059b9be48> > [ 18.672073] CR2: ffff88055c883000 > [ 18.678852] ---[ end trace d84e34461c40637a ]--- > [ 18.685641] Kernel panic - not syncing: Attempted to kill init! > exitcode=0x00000009 > [ 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? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Ingo Molnar <mingo@kernel.org> |
|---|---|
| Date | 2015-11-04 19:10 +0100 |
| Subject | Re: Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core |
| Message-ID | <qraFs-3T7-33@gated-at.bofh.it> |
| In reply to | #1262393 |
* Stephen Smalley <sds@tycho.nsa.gov> 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 (ffffffff822fc000 - > >ffffffff82410000) > >[ 18.430314] Write protecting the kernel read-only data: 18432k > >[ 18.441054] Freeing unused kernel memory: 1144K (ffff880001ae2000 - > >ffff880001c00000) > >[ 18.447966] Freeing unused kernel memory: 1560K (ffff88000207a000 - > >ffff880002200000) > >[ 18.453947] BUG: unable to handle kernel paging request at > >ffff88055c883000 > >[ 18.459943] IP: [<ffffffff8105af8e>] > >ptdump_walk_pgd_level_core+0x20e/0x440 > >[ 18.465847] PGD 2212067 PUD 0 > >[ 18.471564] Oops: 0000 [#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: ffff880059b90000 ti: ffff880059b98000 task.ti: > >ffff880059b98000 > >[ 18.500852] RIP: e030:[<ffffffff8105af8e>] [<ffffffff8105af8e>] > >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 *0xffffffff8105af8e should normally do the trick. Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Sander Eikelenboom <linux@eikelenboom.it> |
|---|---|
| Date | 2015-11-04 19:20 +0100 |
| Subject | Re: Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core |
| Message-ID | <qraP7-3Xl-13@gated-at.bofh.it> |
| In reply to | #1262478 |
On 2015-11-04 19:06, Ingo Molnar wrote:
> * Stephen Smalley <sds@tycho.nsa.gov> 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 (ffffffff822fc000 -
>> >ffffffff82410000)
>> >[ 18.430314] Write protecting the kernel read-only data: 18432k
>> >[ 18.441054] Freeing unused kernel memory: 1144K (ffff880001ae2000 -
>> >ffff880001c00000)
>> >[ 18.447966] Freeing unused kernel memory: 1560K (ffff88000207a000 -
>> >ffff880002200000)
>> >[ 18.453947] BUG: unable to handle kernel paging request at
>> >ffff88055c883000
>> >[ 18.459943] IP: [<ffffffff8105af8e>]
>> >ptdump_walk_pgd_level_core+0x20e/0x440
>> >[ 18.465847] PGD 2212067 PUD 0
>> >[ 18.471564] Oops: 0000 [#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: ffff880059b90000 ti: ffff880059b98000 task.ti:
>> >ffff880059b98000
>> >[ 18.500852] RIP: e030:[<ffffffff8105af8e>] [<ffffffff8105af8e>]
>> >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 *0xffffffff8105af8e
>
> should normally do the trick.
>
> Thanks,
>
> Ingo
Hi Ingo,
(gdb) list *0xffffffff8105af8e
0xffffffff8105af8e 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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| From | Stephen Smalley <sds@tycho.nsa.gov> |
|---|---|
| Date | 2015-11-04 19:50 +0100 |
| Subject | Re: Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core |
| Message-ID | <qrbi9-47z-13@gated-at.bofh.it> |
| In reply to | #1262393 |
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 (ffffffff822fc000 - >>> ffffffff82410000) >>> [ 18.430314] Write protecting the kernel read-only data: 18432k >>> [ 18.441054] Freeing unused kernel memory: 1144K (ffff880001ae2000 - >>> ffff880001c00000) >>> [ 18.447966] Freeing unused kernel memory: 1560K (ffff88000207a000 - >>> ffff880002200000) >>> [ 18.453947] BUG: unable to handle kernel paging request at >>> ffff88055c883000 >>> [ 18.459943] IP: [<ffffffff8105af8e>] >>> ptdump_walk_pgd_level_core+0x20e/0x440 >>> [ 18.465847] PGD 2212067 PUD 0 >>> [ 18.471564] Oops: 0000 [#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: ffff880059b90000 ti: ffff880059b98000 task.ti: >>> ffff880059b98000 >>> [ 18.500852] RIP: e030:[<ffffffff8105af8e>] [<ffffffff8105af8e>] >>> ptdump_walk_pgd_level_core+0x20e/0x440 >>> [ 18.507102] RSP: e02b:ffff880059b9be48 EFLAGS: 00010296 >>> [ 18.513351] RAX: ffff88055c883000 RBX: ffffffff81ae2000 RCX: >>> ffff880000000000 >>> [ 18.519733] RDX: 0000000000000067 RSI: ffff880059b9be98 RDI: >>> ffff880000001000 >>> [ 18.526129] RBP: ffff880059b9bf00 R08: 0000000000000000 R09: >>> 0000000000000000 >>> [ 18.532522] R10: ffff88005fd0e790 R11: 0000000000000001 R12: >>> ffff880080000000 >>> [ 18.538891] R13: ffffc00000000fff R14: ffff880059b9be98 R15: >>> 0000000000000000 >>> [ 18.545247] FS: 0000000000000000(0000) GS:ffff88005f680000(0000) >>> knlGS:0000000000000000 >>> [ 18.551708] CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b >>> [ 18.558153] CR2: ffff88055c883000 CR3: 0000000002211000 CR4: >>> 0000000000000660 >>> [ 18.564686] Stack: >>> [ 18.571106] 0000000159b9be50 ffffffff82211000 ffff88055c884000 >>> 0000000000000800 >>> [ 18.577704] 0000800000000000 ffff88055c883000 0000000000000007 >>> ffff88005fd0e790 >>> [ 18.584291] ffff880059b9bed8 ffffffff81156ace 0000000000000001 >>> 0000000000000000 >>> [ 18.590916] Call Trace: >>> [ 18.597458] [<ffffffff81156ace>] ? free_reserved_area+0x11e/0x120 >>> [ 18.604180] [<ffffffff8105b1e2>] >>> ptdump_walk_pgd_level_checkwx+0x12/0x20 >>> [ 18.611014] [<ffffffff810515b9>] mark_rodata_ro+0xe9/0xf0 >>> [ 18.617819] [<ffffffff81ad3380>] ? rest_init+0x80/0x80 >>> [ 18.624512] [<ffffffff81ad3398>] kernel_init+0x18/0xe0 >>> [ 18.631095] [<ffffffff81adadcf>] ret_from_fork+0x3f/0x70 >>> [ 18.637650] [<ffffffff81ad3380>] ? 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 [<ffffffff8105af8e>] >>> ptdump_walk_pgd_level_core+0x20e/0x440 >>> [ 18.665211] RSP <ffff880059b9be48> >>> [ 18.672073] CR2: ffff88055c883000 >>> [ 18.678852] ---[ end trace d84e34461c40637a ]--- >>> [ 18.685641] Kernel panic - not syncing: Attempted to kill init! >>> exitcode=0x00000009 >>> [ 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Sander Eikelenboom <linux@eikelenboom.it> |
|---|---|
| Date | 2015-11-04 21:10 +0100 |
| Subject | Re: Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core |
| Message-ID | <qrcxA-59d-9@gated-at.bofh.it> |
| In reply to | #1262505 |
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 (ffffffff822fc000 >>>> - >>>> ffffffff82410000) >>>> [ 18.430314] Write protecting the kernel read-only data: 18432k >>>> [ 18.441054] Freeing unused kernel memory: 1144K (ffff880001ae2000 >>>> - >>>> ffff880001c00000) >>>> [ 18.447966] Freeing unused kernel memory: 1560K (ffff88000207a000 >>>> - >>>> ffff880002200000) >>>> [ 18.453947] BUG: unable to handle kernel paging request at >>>> ffff88055c883000 >>>> [ 18.459943] IP: [<ffffffff8105af8e>] >>>> ptdump_walk_pgd_level_core+0x20e/0x440 >>>> [ 18.465847] PGD 2212067 PUD 0 >>>> [ 18.471564] Oops: 0000 [#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: ffff880059b90000 ti: ffff880059b98000 task.ti: >>>> ffff880059b98000 >>>> [ 18.500852] RIP: e030:[<ffffffff8105af8e>] [<ffffffff8105af8e>] >>>> ptdump_walk_pgd_level_core+0x20e/0x440 >>>> [ 18.507102] RSP: e02b:ffff880059b9be48 EFLAGS: 00010296 >>>> [ 18.513351] RAX: ffff88055c883000 RBX: ffffffff81ae2000 RCX: >>>> ffff880000000000 >>>> [ 18.519733] RDX: 0000000000000067 RSI: ffff880059b9be98 RDI: >>>> ffff880000001000 >>>> [ 18.526129] RBP: ffff880059b9bf00 R08: 0000000000000000 R09: >>>> 0000000000000000 >>>> [ 18.532522] R10: ffff88005fd0e790 R11: 0000000000000001 R12: >>>> ffff880080000000 >>>> [ 18.538891] R13: ffffc00000000fff R14: ffff880059b9be98 R15: >>>> 0000000000000000 >>>> [ 18.545247] FS: 0000000000000000(0000) GS:ffff88005f680000(0000) >>>> knlGS:0000000000000000 >>>> [ 18.551708] CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b >>>> [ 18.558153] CR2: ffff88055c883000 CR3: 0000000002211000 CR4: >>>> 0000000000000660 >>>> [ 18.564686] Stack: >>>> [ 18.571106] 0000000159b9be50 ffffffff82211000 ffff88055c884000 >>>> 0000000000000800 >>>> [ 18.577704] 0000800000000000 ffff88055c883000 0000000000000007 >>>> ffff88005fd0e790 >>>> [ 18.584291] ffff880059b9bed8 ffffffff81156ace 0000000000000001 >>>> 0000000000000000 >>>> [ 18.590916] Call Trace: >>>> [ 18.597458] [<ffffffff81156ace>] ? >>>> free_reserved_area+0x11e/0x120 >>>> [ 18.604180] [<ffffffff8105b1e2>] >>>> ptdump_walk_pgd_level_checkwx+0x12/0x20 >>>> [ 18.611014] [<ffffffff810515b9>] mark_rodata_ro+0xe9/0xf0 >>>> [ 18.617819] [<ffffffff81ad3380>] ? rest_init+0x80/0x80 >>>> [ 18.624512] [<ffffffff81ad3398>] kernel_init+0x18/0xe0 >>>> [ 18.631095] [<ffffffff81adadcf>] ret_from_fork+0x3f/0x70 >>>> [ 18.637650] [<ffffffff81ad3380>] ? 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 [<ffffffff8105af8e>] >>>> ptdump_walk_pgd_level_core+0x20e/0x440 >>>> [ 18.665211] RSP <ffff880059b9be48> >>>> [ 18.672073] CR2: ffff88055c883000 >>>> [ 18.678852] ---[ end trace d84e34461c40637a ]--- >>>> [ 18.685641] Kernel panic - not syncing: Attempted to kill init! >>>> exitcode=0x00000009 >>>> [ 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 ffff88055c883000 [ 902.402749] IP: [<ffffffff8105af7e>] ptdump_walk_pgd_level_core+0x20e/0x440 [ 902.416261] PGD 2212067 PUD 0 [ 902.427768] Oops: 0000 [#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: ffff88004b49e300 ti: ffff88005928c000 task.ti: ffff88005928c000 [ 902.479133] RIP: e030:[<ffffffff8105af7e>] [<ffffffff8105af7e>] ptdump_walk_pgd_level_core+0x20e/0x440 [ 902.489536] RSP: e02b:ffff88005928fd20 EFLAGS: 00010296 [ 902.499692] RAX: ffff88055c883000 RBX: 0000000000000000 RCX: ffff880000000000 [ 902.509755] RDX: 0000000000000067 RSI: ffff88005928fd70 RDI: ffff880000001000 [ 902.519680] RBP: ffff88005928fdd8 R08: 0000000000001000 R09: 000000000000ffff [ 902.529555] R10: 0000000000000000 R11: 0000000000000246 R12: ffff88005928ff20 [ 902.539349] R13: ffffc00000000fff R14: ffff88005928fd70 R15: ffff880033c773c0 [ 902.549081] FS: 00007f56b07d4700(0000) GS:ffff88005f680000(0000) knlGS:0000000000000000 [ 902.558690] CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b [ 902.568111] CR2: ffff88055c883000 CR3: 000000004563f000 CR4: 0000000000000660 [ 902.577508] Stack: [ 902.586741] 00000000810ffd21 ffffffff82211000 ffff88055c884000 0000000000000800 [ 902.596090] 0000800000000000 ffff88055c883000 00007f56b0629000 0000000000000001 [ 902.605395] ffff88005928ff20 ffffffff81ad88ba 0000000000000001 0000000000000000 [ 902.614452] Call Trace: [ 902.623254] [<ffffffff81ad88ba>] ? __mutex_lock_slowpath+0x27a/0x3a0 [ 902.632067] [<ffffffff8105b1bd>] ptdump_show+0xd/0x20 [ 902.640767] [<ffffffff811c857b>] seq_read+0xcb/0x380 [ 902.649379] [<ffffffff811a8273>] __vfs_read+0x23/0xd0 [ 902.657909] [<ffffffff81167cb5>] ? vm_mmap_pgoff+0x75/0xa0 [ 902.666195] [<ffffffff811a8a01>] vfs_read+0x81/0x130 [ 902.674248] [<ffffffff811a96f4>] SyS_read+0x44/0xb0 [ 902.682220] [<ffffffff81ada6ae>] entry_SYSCALL_64_fastpath+0x12/0x71 [ 902.690182] 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 [ 902.706831] RIP [<ffffffff8105af7e>] ptdump_walk_pgd_level_core+0x20e/0x440 [ 902.715008] RSP <ffff88005928fd20> [ 902.722955] CR2: ffff88055c883000 [ 902.730630] ---[ end trace 5d94ee3d1b42814b ]--- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Boris Ostrovsky <boris.ostrovsky@oracle.com> |
|---|---|
| Date | 2015-11-05 00:20 +0100 |
| Subject | Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core |
| Message-ID | <qrfvr-72q-1@gated-at.bofh.it> |
| In reply to | #1262559 |
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
>>>>> (ffffffff822fc000 -
>>>>> ffffffff82410000)
>>>>> [ 18.430314] Write protecting the kernel read-only data: 18432k
>>>>> [ 18.441054] Freeing unused kernel memory: 1144K
>>>>> (ffff880001ae2000 -
>>>>> ffff880001c00000)
>>>>> [ 18.447966] Freeing unused kernel memory: 1560K
>>>>> (ffff88000207a000 -
>>>>> ffff880002200000)
>>>>> [ 18.453947] BUG: unable to handle kernel paging request at
>>>>> ffff88055c883000
>>>>> [ 18.459943] IP: [<ffffffff8105af8e>]
>>>>> ptdump_walk_pgd_level_core+0x20e/0x440
>>>>> [ 18.465847] PGD 2212067 PUD 0
>>>>> [ 18.471564] Oops: 0000 [#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: ffff880059b90000 ti: ffff880059b98000 task.ti:
>>>>> ffff880059b98000
>>>>> [ 18.500852] RIP: e030:[<ffffffff8105af8e>] [<ffffffff8105af8e>]
>>>>> ptdump_walk_pgd_level_core+0x20e/0x440
>>>>> [ 18.507102] RSP: e02b:ffff880059b9be48 EFLAGS: 00010296
>>>>> [ 18.513351] RAX: ffff88055c883000 RBX: ffffffff81ae2000 RCX:
>>>>> ffff880000000000
>>>>> [ 18.519733] RDX: 0000000000000067 RSI: ffff880059b9be98 RDI:
>>>>> ffff880000001000
>>>>> [ 18.526129] RBP: ffff880059b9bf00 R08: 0000000000000000 R09:
>>>>> 0000000000000000
>>>>> [ 18.532522] R10: ffff88005fd0e790 R11: 0000000000000001 R12:
>>>>> ffff880080000000
>>>>> [ 18.538891] R13: ffffc00000000fff R14: ffff880059b9be98 R15:
>>>>> 0000000000000000
>>>>> [ 18.545247] FS: 0000000000000000(0000) GS:ffff88005f680000(0000)
>>>>> knlGS:0000000000000000
>>>>> [ 18.551708] CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b
>>>>> [ 18.558153] CR2: ffff88055c883000 CR3: 0000000002211000 CR4:
>>>>> 0000000000000660
>>>>> [ 18.564686] Stack:
>>>>> [ 18.571106] 0000000159b9be50 ffffffff82211000 ffff88055c884000
>>>>> 0000000000000800
>>>>> [ 18.577704] 0000800000000000 ffff88055c883000 0000000000000007
>>>>> ffff88005fd0e790
>>>>> [ 18.584291] ffff880059b9bed8 ffffffff81156ace 0000000000000001
>>>>> 0000000000000000
>>>>> [ 18.590916] Call Trace:
>>>>> [ 18.597458] [<ffffffff81156ace>] ? free_reserved_area+0x11e/0x120
>>>>> [ 18.604180] [<ffffffff8105b1e2>]
>>>>> ptdump_walk_pgd_level_checkwx+0x12/0x20
>>>>> [ 18.611014] [<ffffffff810515b9>] mark_rodata_ro+0xe9/0xf0
>>>>> [ 18.617819] [<ffffffff81ad3380>] ? rest_init+0x80/0x80
>>>>> [ 18.624512] [<ffffffff81ad3398>] kernel_init+0x18/0xe0
>>>>> [ 18.631095] [<ffffffff81adadcf>] ret_from_fork+0x3f/0x70
>>>>> [ 18.637650] [<ffffffff81ad3380>] ? 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 [<ffffffff8105af8e>]
>>>>> ptdump_walk_pgd_level_core+0x20e/0x440
>>>>> [ 18.665211] RSP <ffff880059b9be48>
>>>>> [ 18.672073] CR2: ffff88055c883000
>>>>> [ 18.678852] ---[ end trace d84e34461c40637a ]---
>>>>> [ 18.685641] Kernel panic - not syncing: Attempted to kill init!
>>>>> exitcode=0x00000009
>>>>> [ 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
+/* ffff800000000000 - ffff87ffffffffff 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 *) &init_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, &st, __pgprot(prot), 1);
--
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Please read the FAQ at http://www.tux.org/lkml/
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| From | Sander Eikelenboom <linux@eikelenboom.it> |
|---|---|
| Date | 2015-11-05 10:20 +0100 |
| Subject | Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core |
| Message-ID | <qroS5-4FF-3@gated-at.bofh.it> |
| In reply to | #1262729 |
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
>>>>>> (ffffffff822fc000 -
>>>>>> ffffffff82410000)
>>>>>> [ 18.430314] Write protecting the kernel read-only data: 18432k
>>>>>> [ 18.441054] Freeing unused kernel memory: 1144K
>>>>>> (ffff880001ae2000 -
>>>>>> ffff880001c00000)
>>>>>> [ 18.447966] Freeing unused kernel memory: 1560K
>>>>>> (ffff88000207a000 -
>>>>>> ffff880002200000)
>>>>>> [ 18.453947] BUG: unable to handle kernel paging request at
>>>>>> ffff88055c883000
>>>>>> [ 18.459943] IP: [<ffffffff8105af8e>]
>>>>>> ptdump_walk_pgd_level_core+0x20e/0x440
>>>>>> [ 18.465847] PGD 2212067 PUD 0
>>>>>> [ 18.471564] Oops: 0000 [#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: ffff880059b90000 ti: ffff880059b98000
>>>>>> task.ti:
>>>>>> ffff880059b98000
>>>>>> [ 18.500852] RIP: e030:[<ffffffff8105af8e>] [<ffffffff8105af8e>]
>>>>>> ptdump_walk_pgd_level_core+0x20e/0x440
>>>>>> [ 18.507102] RSP: e02b:ffff880059b9be48 EFLAGS: 00010296
>>>>>> [ 18.513351] RAX: ffff88055c883000 RBX: ffffffff81ae2000 RCX:
>>>>>> ffff880000000000
>>>>>> [ 18.519733] RDX: 0000000000000067 RSI: ffff880059b9be98 RDI:
>>>>>> ffff880000001000
>>>>>> [ 18.526129] RBP: ffff880059b9bf00 R08: 0000000000000000 R09:
>>>>>> 0000000000000000
>>>>>> [ 18.532522] R10: ffff88005fd0e790 R11: 0000000000000001 R12:
>>>>>> ffff880080000000
>>>>>> [ 18.538891] R13: ffffc00000000fff R14: ffff880059b9be98 R15:
>>>>>> 0000000000000000
>>>>>> [ 18.545247] FS: 0000000000000000(0000)
>>>>>> GS:ffff88005f680000(0000)
>>>>>> knlGS:0000000000000000
>>>>>> [ 18.551708] CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b
>>>>>> [ 18.558153] CR2: ffff88055c883000 CR3: 0000000002211000 CR4:
>>>>>> 0000000000000660
>>>>>> [ 18.564686] Stack:
>>>>>> [ 18.571106] 0000000159b9be50 ffffffff82211000 ffff88055c884000
>>>>>> 0000000000000800
>>>>>> [ 18.577704] 0000800000000000 ffff88055c883000 0000000000000007
>>>>>> ffff88005fd0e790
>>>>>> [ 18.584291] ffff880059b9bed8 ffffffff81156ace 0000000000000001
>>>>>> 0000000000000000
>>>>>> [ 18.590916] Call Trace:
>>>>>> [ 18.597458] [<ffffffff81156ace>] ?
>>>>>> free_reserved_area+0x11e/0x120
>>>>>> [ 18.604180] [<ffffffff8105b1e2>]
>>>>>> ptdump_walk_pgd_level_checkwx+0x12/0x20
>>>>>> [ 18.611014] [<ffffffff810515b9>] mark_rodata_ro+0xe9/0xf0
>>>>>> [ 18.617819] [<ffffffff81ad3380>] ? rest_init+0x80/0x80
>>>>>> [ 18.624512] [<ffffffff81ad3398>] kernel_init+0x18/0xe0
>>>>>> [ 18.631095] [<ffffffff81adadcf>] ret_from_fork+0x3f/0x70
>>>>>> [ 18.637650] [<ffffffff81ad3380>] ? 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 [<ffffffff8105af8e>]
>>>>>> ptdump_walk_pgd_level_core+0x20e/0x440
>>>>>> [ 18.665211] RSP <ffff880059b9be48>
>>>>>> [ 18.672073] CR2: ffff88055c883000
>>>>>> [ 18.678852] ---[ end trace d84e34461c40637a ]---
>>>>>> [ 18.685641] Kernel panic - not syncing: Attempted to kill init!
>>>>>> exitcode=0x00000009
>>>>>> [ 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
> +/* ffff800000000000 - ffff87ffffffffff 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 *) &init_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, &st, __pgprot(prot), 1);
Hi Boris,
Thank for your patch !
It makes "cat /sys/kernel/debug/kernel_page_tables" work and
prevents a kernel with CONFIG_DEBUG_WX=y from crashing at boot.
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 (ffffffff822fc000 -
ffffffff82410000)
[ 19.041339] Write protecting the kernel read-only data: 18432k
[ 19.052596] Freeing unused kernel memory: 1144K (ffff880001ae2000 -
ffff880001c00000)
[ 19.060285] Freeing unused kernel memory: 1560K (ffff88000207a000 -
ffff880002200000)
[ 19.067079] ------------[ cut here ]------------
[ 19.073931] WARNING: CPU: 5 PID: 1 at
arch/x86/mm/dump_pagetables.c:225 note_page+0x619/0x7e0()
[ 19.081039] x86/mm: Found insecure W+X mapping at address
ffff880000000000/0xffff880000000000
[ 19.088293] Modules linked in:
[ 19.095477] CPU: 5 PID: 1 Comm: swapper/0 Not tainted
4.3.0-mw-20151104-linus-doflr-withdebugwx-noptdump-ptdumppatch+ #1
[ 19.102971] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640) , BIOS
V1.8B1 09/13/2010
[ 19.110594] ffffffff81f381d3 ffff880059b9bd60 ffffffff81428992
ffff880059b9bda8
[ 19.118239] ffff880059b9bd98 ffffffff810ca7ec ffff8800025d8010
0000000000000004
[ 19.125870] 0010000000000067 ffff880059b9be98 0000000000000000
ffff880059b9bdf8
[ 19.133526] Call Trace:
[ 19.141212] [<ffffffff81428992>] dump_stack+0x44/0x62
[ 19.148983] [<ffffffff810ca7ec>] warn_slowpath_common+0x7c/0xb0
[ 19.156877] [<ffffffff810ca867>] warn_slowpath_fmt+0x47/0x50
[ 19.164813] [<ffffffff8105abb9>] note_page+0x619/0x7e0
[ 19.172656] [<ffffffff8105b135>]
ptdump_walk_pgd_level_core+0x3b5/0x450
[ 19.180583] [<ffffffff8105b1f2>]
ptdump_walk_pgd_level_checkwx+0x12/0x20
[ 19.188427] [<ffffffff810515b9>] mark_rodata_ro+0xe9/0xf0
[ 19.196221] [<ffffffff81ad2f70>] ? rest_init+0x80/0x80
[ 19.204012] [<ffffffff81ad2f88>] kernel_init+0x18/0xe0
[ 19.211732] [<ffffffff81ada98f>] ret_from_fork+0x3f/0x70
[ 19.219467] [<ffffffff81ad2f70>] ? rest_init+0x80/0x80
[ 19.227145] ---[ end trace 5fc0f4297b911570 ]---
[ 19.244382] x86/mm: Checked W+X mappings: FAILED, 4602 W+X pages
found.
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| From | Boris Ostrovsky <boris.ostrovsky@oracle.com> |
|---|---|
| Date | 2015-11-05 15:00 +0100 |
| Subject | Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core |
| Message-ID | <qrtf4-7pc-3@gated-at.bofh.it> |
| In reply to | #1263032 |
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 (ffffffff822fc000 - > ffffffff82410000) > [ 19.041339] Write protecting the kernel read-only data: 18432k > [ 19.052596] Freeing unused kernel memory: 1144K (ffff880001ae2000 - > ffff880001c00000) > [ 19.060285] Freeing unused kernel memory: 1560K (ffff88000207a000 - > ffff880002200000) > [ 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Sander Eikelenboom <linux@eikelenboom.it> |
|---|---|
| Date | 2015-11-05 15:10 +0100 |
| Subject | Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core |
| Message-ID | <qrtoJ-7I5-7@gated-at.bofh.it> |
| In reply to | #1263220 |
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 (ffffffff822fc000 - >> ffffffff82410000) >> [ 19.041339] Write protecting the kernel read-only data: 18432k >> [ 19.052596] Freeing unused kernel memory: 1144K (ffff880001ae2000 - >> ffff880001c00000) >> [ 19.060285] Freeing unused kernel memory: 1560K (ffff88000207a000 - >> ffff880002200000) >> [ 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Boris Ostrovsky <boris.ostrovsky@oracle.com> |
|---|---|
| Date | 2015-11-04 21:20 +0100 |
| Subject | Re: [Xen-devel] Linux 4.4 MW: Boot under Xen fails with CONFIG_DEBUG_WX enabled: RIP: ptdump_walk_pgd_level_core |
| Message-ID | <qrcHg-5df-21@gated-at.bofh.it> |
| In reply to | #1262505 |
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 (ffffffff822fc000 - >>>> ffffffff82410000) >>>> [ 18.430314] Write protecting the kernel read-only data: 18432k >>>> [ 18.441054] Freeing unused kernel memory: 1144K (ffff880001ae2000 - >>>> ffff880001c00000) >>>> [ 18.447966] Freeing unused kernel memory: 1560K (ffff88000207a000 - >>>> ffff880002200000) >>>> [ 18.453947] BUG: unable to handle kernel paging request at >>>> ffff88055c883000 >>>> [ 18.459943] IP: [<ffffffff8105af8e>] >>>> ptdump_walk_pgd_level_core+0x20e/0x440 >>>> [ 18.465847] PGD 2212067 PUD 0 >>>> [ 18.471564] Oops: 0000 [#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: ffff880059b90000 ti: ffff880059b98000 task.ti: >>>> ffff880059b98000 >>>> [ 18.500852] RIP: e030:[<ffffffff8105af8e>] [<ffffffff8105af8e>] >>>> ptdump_walk_pgd_level_core+0x20e/0x440 >>>> [ 18.507102] RSP: e02b:ffff880059b9be48 EFLAGS: 00010296 >>>> [ 18.513351] RAX: ffff88055c883000 RBX: ffffffff81ae2000 RCX: >>>> ffff880000000000 >>>> [ 18.519733] RDX: 0000000000000067 RSI: ffff880059b9be98 RDI: >>>> ffff880000001000 >>>> [ 18.526129] RBP: ffff880059b9bf00 R08: 0000000000000000 R09: >>>> 0000000000000000 >>>> [ 18.532522] R10: ffff88005fd0e790 R11: 0000000000000001 R12: >>>> ffff880080000000 >>>> [ 18.538891] R13: ffffc00000000fff R14: ffff880059b9be98 R15: >>>> 0000000000000000 >>>> [ 18.545247] FS: 0000000000000000(0000) GS:ffff88005f680000(0000) >>>> knlGS:0000000000000000 >>>> [ 18.551708] CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b >>>> [ 18.558153] CR2: ffff88055c883000 CR3: 0000000002211000 CR4: >>>> 0000000000000660 >>>> [ 18.564686] Stack: >>>> [ 18.571106] 0000000159b9be50 ffffffff82211000 ffff88055c884000 >>>> 0000000000000800 >>>> [ 18.577704] 0000800000000000 ffff88055c883000 0000000000000007 >>>> ffff88005fd0e790 >>>> [ 18.584291] ffff880059b9bed8 ffffffff81156ace 0000000000000001 >>>> 0000000000000000 >>>> [ 18.590916] Call Trace: >>>> [ 18.597458] [<ffffffff81156ace>] ? free_reserved_area+0x11e/0x120 >>>> [ 18.604180] [<ffffffff8105b1e2>] >>>> ptdump_walk_pgd_level_checkwx+0x12/0x20 >>>> [ 18.611014] [<ffffffff810515b9>] mark_rodata_ro+0xe9/0xf0 >>>> [ 18.617819] [<ffffffff81ad3380>] ? rest_init+0x80/0x80 >>>> [ 18.624512] [<ffffffff81ad3398>] kernel_init+0x18/0xe0 >>>> [ 18.631095] [<ffffffff81adadcf>] ret_from_fork+0x3f/0x70 >>>> [ 18.637650] [<ffffffff81ad3380>] ? 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 [<ffffffff8105af8e>] >>>> ptdump_walk_pgd_level_core+0x20e/0x440 >>>> [ 18.665211] RSP <ffff880059b9be48> >>>> [ 18.672073] CR2: ffff88055c883000 >>>> [ 18.678852] ---[ end trace d84e34461c40637a ]--- >>>> [ 18.685641] Kernel panic - not syncing: Attempted to kill init! >>>> exitcode=0x00000009 >>>> [ 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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