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drm/radeon: fix invalid memory access in radeon_atrm_get_bios()

PATCH In review Igor Murzov 3 participants 5 messages Jan 22, 2012 – Feb 1, 2012

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Igor Murzov

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#0 lore raw

PATCH 1/2 drm/radeon: fix invalid memory access in radeon_atrm_get_bios()

Quoted 1 line

From 77c912ea1eca50a93a34d5be69f9dc96a8bef0d8 Mon Sep 17 00:00:00 2001

From: Igor Murzov <[email protected]>
Date: Sun, 22 Jan 2012 19:02:27 +0400
Subject: [PATCH 1/2] drm/radeon: fix invalid memory access in radeon_atrm_get_bios()

At a boot time I observed following bug:

 BUG: unable to handle kernel paging request at ffff8800a4244000
 IP: [<ffffffff81275b5b>] memcpy+0xb/0x120
 PGD 1816063 PUD 1fe7d067 PMD 1ff9f067 PTE 80000000a4244160
 Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
 CPU 0
 Modules linked in: btusb bluetooth brcmsmac brcmutil crc8 cordic b43 radeon(+)
  mac80211 cfg80211 ttm ohci_hcd drm_kms_helper rfkill drm ssb agpgart mmc_core
  sp5100_tco video battery ac thermal processor rtc_cmos thermal_sys snd_hda_codec_hdmi
  joydev snd_hda_codec_conexant button bcma pcmcia snd_hda_intel snd_hda_codec
  snd_hwdep snd_pcm shpchp pcmcia_core k8temp snd_timer atl1c snd psmouse hwmon
  i2c_piix4 i2c_algo_bit soundcore evdev i2c_core ehci_hcd sg serio_raw snd_page_alloc
  loop btrfs

Pid: 1008, comm: modprobe Not tainted 3.3.0-rc1 #21 LENOVO 20046 /AMD CRB

 RIP: 0010:[<ffffffff81275b5b>]  [<ffffffff81275b5b>] memcpy+0xb/0x120
 RSP: 0018:ffff8800aa72db00  EFLAGS: 00010246
 RAX: ffff8800a4150000 RBX: 0000000000001000 RCX: 0000000000000087
 RDX: 0000000000000000 RSI: ffff8800a4244000 RDI: ffff8800a4150bc8
 RBP: ffff8800aa72db78 R08: 0000000000000010 R09: ffffffff8174bbec
 R10: ffffffff812ee010 R11: 0000000000000001 R12: 0000000000001000
 R13: 0000000000010000 R14: ffff8800a4140000 R15: ffff8800aaba1800
 FS:  00007ff9a3bd4720(0000) GS:ffff8800afa00000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
 CR2: ffff8800a4244000 CR3: 00000000a9c18000 CR4: 00000000000006f0
 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
 Process modprobe (pid: 1008, threadinfo ffff8800aa72c000, task ffff8800aa0e4000)
 Stack:
  ffffffffa04e7c7b 0000000000000001 0000000000010000 ffff8800aa72db28
  ffffffff00000001 0000000000001000 ffffffff8113cbef 0000000000000020
  ffff8800a4243420 ffff880000000002 ffff8800aa72db08 ffff8800a9d42000
 Call Trace:
  [<ffffffffa04e7c7b>] ? radeon_atrm_get_bios_chunk+0x8b/0xd0 [radeon]
  [<ffffffff8113cbef>] ? kmalloc_order_trace+0x3f/0xb0
  [<ffffffffa04a9298>] radeon_get_bios+0x68/0x2f0 [radeon]
  [<ffffffffa04c7a30>] rv770_init+0x40/0x280 [radeon]
  [<ffffffffa047d740>] radeon_device_init+0x560/0x600 [radeon]
  [<ffffffffa047ef4f>] radeon_driver_load_kms+0xaf/0x170 [radeon]
  [<ffffffffa043cdde>] drm_get_pci_dev+0x18e/0x2c0 [drm]
  [<ffffffffa04e7e95>] radeon_pci_probe+0xad/0xb5 [radeon]
  [<ffffffff81296c5f>] local_pci_probe+0x5f/0xd0
  [<ffffffff81297418>] pci_device_probe+0x88/0xb0
  [<ffffffff813417aa>] ? driver_sysfs_add+0x7a/0xb0
  [<ffffffff813418d8>] really_probe+0x68/0x180
  [<ffffffff81341be5>] driver_probe_device+0x45/0x70
  [<ffffffff81341cb3>] __driver_attach+0xa3/0xb0
  [<ffffffff81341c10>] ? driver_probe_device+0x70/0x70
  [<ffffffff813400ce>] bus_for_each_dev+0x5e/0x90
  [<ffffffff8134172e>] driver_attach+0x1e/0x20
  [<ffffffff81341298>] bus_add_driver+0xc8/0x280
  [<ffffffff813422c6>] driver_register+0x76/0x140
  [<ffffffff812976d6>] __pci_register_driver+0x66/0xe0
  [<ffffffffa043d021>] drm_pci_init+0x111/0x120 [drm]
  [<ffffffff8133c67a>] ? vga_switcheroo_register_handler+0x3a/0x60
  [<ffffffffa0229000>] ? 0xffffffffa0228fff
  [<ffffffffa02290ec>] radeon_init+0xec/0xee [radeon]
  [<ffffffff810002f2>] do_one_initcall+0x42/0x180
  [<ffffffff8109d8d2>] sys_init_module+0x92/0x1e0
  [<ffffffff815407a9>] system_call_fastpath+0x16/0x1b
 Code: 58 2a 43 50 88 43 4e 48 83 c4 08 5b c9 c3 66 90 e8 cb fd ff ff eb
  e6 90 90 90 90 90 90 90 90 90 48 89 f8 89 d1 c1 e9 03 83 e2 07 <f3> 48
  a5 89 d1 f3 a4 c3 20 48 83 ea 20 4c 8b 06 4c 8b 4e 08 4c
 RIP  [<ffffffff81275b5b>] memcpy+0xb/0x120
  RSP <ffff8800aa72db00>
 CR2: ffff8800a4244000
 ---[ end trace fcffa1599cf56382 ]---

Call to acpi_evaluate_object() not always returns 4096 bytes chunks, on my system it can return 2048 bytes chunk, so pass the length of retrieved chunk to memcpy(), not the length of the recieving buffer.

Signed-off-by Igor Murzov <[email protected]>
---
 drivers/gpu/drm/radeon/radeon_atpx_handler.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
drivers/gpu/drm/radeon/radeon_atpx_handler.c +1 -1
index 9d95792..c666a5b 100644
@@ -58,7 +58,7 @@ static int radeon_atrm_call(acpi_handle atrm_handle, uint8_t *bios,
 	}
 
 	obj = (union acpi_object *)buffer.pointer;
-	memcpy(bios+offset, obj->buffer.pointer, len);
+	memcpy(bios+offset, obj->buffer.pointer, obj->buffer.length);
 	kfree(buffer.pointer);
 	return len;
 }
Signature · 1 line
1.7.5.1
author
#1 lore raw

PATCH 2/2 drm/radeon: finish getting bios earlier

Quoted 1 line

From 4a57f34f6ebc3adac143a329327f69cb0469c2e2 Mon Sep 17 00:00:00 2001

From: Igor Murzov <[email protected]>
Date: Sun, 22 Jan 2012 19:05:13 +0400
Subject: [PATCH 2/2] drm/radeon: finish getting bios earlier

Return a number of bytes read in radeon_atrm_get_bios_chunk() and properly check this value in radeon_atrm_get_bios().
If radeon_atrm_get_bios_chunk() read less bytes then were requested, it means that it finished reading bios data.

Prior to this patch, condition in radeon_atrm_get_bios() was always equivalent to "if (ATRM_BIOS_PAGE <= 0)", so it was always false, thus radeon_atrm_get_bios() was trying to read past the bios data wasting boot time.

On my lenovo ideapad u455 laptop this patch drops bios reading time from ~5.5s to ~1.5s.

Signed-off-by Igor Murzov <[email protected]>
---
 drivers/gpu/drm/radeon/radeon_atpx_handler.c |    2 +-
 drivers/gpu/drm/radeon/radeon_bios.c         |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
drivers/gpu/drm/radeon/radeon_atpx_handler.c +1 -1
index c666a5b..13ac63b 100644
@@ -60,7 +60,7 @@ static int radeon_atrm_call(acpi_handle atrm_handle, uint8_t *bios,
 	obj = (union acpi_object *)buffer.pointer;
 	memcpy(bios+offset, obj->buffer.pointer, obj->buffer.length);
 	kfree(buffer.pointer);
-	return len;
+	return obj->buffer.length;
 }
 
 bool radeon_atrm_supported(struct pci_dev *pdev)
drivers/gpu/drm/radeon/radeon_bios.c +1 -1
index 229a20f..501f488 100644
@@ -120,7 +120,7 @@ static bool radeon_atrm_get_bios(struct radeon_device *rdev)
 		ret = radeon_atrm_get_bios_chunk(rdev->bios,
 						 (i * ATRM_BIOS_PAGE),
 						 ATRM_BIOS_PAGE);
-		if (ret <= 0)
+		if (ret < ATRM_BIOS_PAGE)
 			break;
 	}
Signature · 1 line
1.7.5.1
Reviewed-by on v1 1/2
#2 lore raw
In reply to Igor Murzov
Quoted 72 lines · Igor Murzov

From 77c912ea1eca50a93a34d5be69f9dc96a8bef0d8 Mon Sep 17 00:00:00 2001
From: Igor Murzov <[email protected]>
Date: Sun, 22 Jan 2012 19:02:27 +0400
Subject: [PATCH 1/2] drm/radeon: fix invalid memory access in radeon_atrm_get_bios()

At a boot time I observed following bug:

 BUG: unable to handle kernel paging request at ffff8800a4244000
 IP: [<ffffffff81275b5b>] memcpy+0xb/0x120
 PGD 1816063 PUD 1fe7d067 PMD 1ff9f067 PTE 80000000a4244160
 Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
 CPU 0
 Modules linked in: btusb bluetooth brcmsmac brcmutil crc8 cordic b43 radeon(+)

 mac80211 cfg80211 ttm ohci_hcd drm_kms_helper rfkill drm ssb agpgart mmc_core sp5100_tco video battery ac thermal processor rtc_cmos thermal_sys snd_hda_codec_hdmi joydev snd_hda_codec_conexant button bcma pcmcia snd_hda_intel snd_hda_codec snd_hwdep snd_pcm shpchp pcmcia_core k8temp snd_timer atl1c snd psmouse hwmon i2c_piix4 i2c_algo_bit soundcore evdev i2c_core ehci_hcd sg serio_raw snd_page_alloc loop btrfs

 Pid: 1008, comm: modprobe Not tainted 3.3.0-rc1 #21 LENOVO 20046                           /AMD CRB

 RIP: 0010:[<ffffffff81275b5b>]  [<ffffffff81275b5b>] memcpy+0xb/0x120

 RSP: 0018:ffff8800aa72db00  EFLAGS: 00010246
 RAX: ffff8800a4150000 RBX: 0000000000001000 RCX: 0000000000000087
 RDX: 0000000000000000 RSI: ffff8800a4244000 RDI: ffff8800a4150bc8
 RBP: ffff8800aa72db78 R08: 0000000000000010 R09: ffffffff8174bbec
 R10: ffffffff812ee010 R11: 0000000000000001 R12: 0000000000001000
 R13: 0000000000010000 R14: ffff8800a4140000 R15: ffff8800aaba1800
 FS:  00007ff9a3bd4720(0000) GS:ffff8800afa00000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
 CR2: ffff8800a4244000 CR3: 00000000a9c18000 CR4: 00000000000006f0
 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process modprobe (pid: 1008, threadinfo ffff8800aa72c000, task ffff8800aa0e4000)

 Stack:
 ffffffffa04e7c7b 0000000000000001 0000000000010000 ffff8800aa72db28
 ffffffff00000001 0000000000001000 ffffffff8113cbef 0000000000000020
 ffff8800a4243420 ffff880000000002 ffff8800aa72db08 ffff8800a9d42000
 Call Trace:
 [<ffffffffa04e7c7b>] ? radeon_atrm_get_bios_chunk+0x8b/0xd0 [radeon]
 [<ffffffff8113cbef>] ? kmalloc_order_trace+0x3f/0xb0
 [<ffffffffa04a9298>] radeon_get_bios+0x68/0x2f0 [radeon]
 [<ffffffffa04c7a30>] rv770_init+0x40/0x280 [radeon]
 [<ffffffffa047d740>] radeon_device_init+0x560/0x600 [radeon]
 [<ffffffffa047ef4f>] radeon_driver_load_kms+0xaf/0x170 [radeon]
 [<ffffffffa043cdde>] drm_get_pci_dev+0x18e/0x2c0 [drm]
 [<ffffffffa04e7e95>] radeon_pci_probe+0xad/0xb5 [radeon]
 [<ffffffff81296c5f>] local_pci_probe+0x5f/0xd0
 [<ffffffff81297418>] pci_device_probe+0x88/0xb0
 [<ffffffff813417aa>] ? driver_sysfs_add+0x7a/0xb0
 [<ffffffff813418d8>] really_probe+0x68/0x180
 [<ffffffff81341be5>] driver_probe_device+0x45/0x70
 [<ffffffff81341cb3>] __driver_attach+0xa3/0xb0
 [<ffffffff81341c10>] ? driver_probe_device+0x70/0x70
 [<ffffffff813400ce>] bus_for_each_dev+0x5e/0x90
 [<ffffffff8134172e>] driver_attach+0x1e/0x20
 [<ffffffff81341298>] bus_add_driver+0xc8/0x280
 [<ffffffff813422c6>] driver_register+0x76/0x140
 [<ffffffff812976d6>] __pci_register_driver+0x66/0xe0
 [<ffffffffa043d021>] drm_pci_init+0x111/0x120 [drm]
 [<ffffffff8133c67a>] ? vga_switcheroo_register_handler+0x3a/0x60
 [<ffffffffa0229000>] ? 0xffffffffa0228fff
 [<ffffffffa02290ec>] radeon_init+0xec/0xee [radeon]
 [<ffffffff810002f2>] do_one_initcall+0x42/0x180
 [<ffffffff8109d8d2>] sys_init_module+0x92/0x1e0
 [<ffffffff815407a9>] system_call_fastpath+0x16/0x1b
 Code: 58 2a 43 50 88 43 4e 48 83 c4 08 5b c9 c3 66 90 e8 cb fd ff ff eb

 e6 90 90 90 90 90 90 90 90 90 48 89 f8 89 d1 c1 e9 03 83 e2 07 <f3> 48 a5 89 d1 f3 a4 c3 20 48 83 ea 20 4c 8b 06 4c 8b 4e 08 4c RIP  [<ffffffff81275b5b>] memcpy+0xb/0x120
 RSP <ffff8800aa72db00>
 CR2: ffff8800a4244000

Quoted 7 lines
 ---[ end trace fcffa1599cf56382 ]---

Call to acpi_evaluate_object() not always returns 4096 bytes chunks, on my system it can return 2048 bytes chunk, so pass the length of retrieved chunk to memcpy(), not the length of the recieving buffer.

Signed-off-by Igor Murzov <[email protected]>

Both patches are:

Reviewed-by Alex Deucher <[email protected]>
Quoted 20 lines

---
 drivers/gpu/drm/radeon/radeon_atpx_handler.c |    2 +-

 1 files changed, 1 insertions(+), 1 deletions(-)
drivers/gpu/drm/radeon/radeon_atpx_handler.c +1 -2
index 9d95792..c666a5b 100644
@@ -58,7 +58,7 @@ static int radeon_atrm_call(acpi_handle atrm_handle, uint8_t *bios,
        }
 
        obj = (union acpi_object *)buffer.pointer;
-       memcpy(bios+offset, obj->buffer.pointer, len);
+       memcpy(bios+offset, obj->buffer.pointer, obj->buffer.length);
        kfree(buffer.pointer);
        return len;
  }
--

1.7.5.1

maintainer
#3 lore raw
Quoted 76 lines · Alex Deucher
Quoted 74 lines · Igor Murzov

From 77c912ea1eca50a93a34d5be69f9dc96a8bef0d8 Mon Sep 17 00:00:00 2001
From: Igor Murzov <[email protected]>
Date: Sun, 22 Jan 2012 19:02:27 +0400
Subject: [PATCH 1/2] drm/radeon: fix invalid memory access in radeon_atrm_get_bios()

At a boot time I observed following bug:

 BUG: unable to handle kernel paging request at ffff8800a4244000
 IP: [<ffffffff81275b5b>] memcpy+0xb/0x120
 PGD 1816063 PUD 1fe7d067 PMD 1ff9f067 PTE 80000000a4244160
 Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
 CPU 0
 Modules linked in: btusb bluetooth brcmsmac brcmutil crc8 cordic b43 radeon(+)

 mac80211 cfg80211 ttm ohci_hcd drm_kms_helper rfkill drm ssb agpgart mmc_core sp5100_tco video battery ac thermal processor rtc_cmos thermal_sys snd_hda_codec_hdmi joydev snd_hda_codec_conexant button bcma pcmcia snd_hda_intel snd_hda_codec snd_hwdep snd_pcm shpchp pcmcia_core k8temp snd_timer atl1c snd psmouse hwmon i2c_piix4 i2c_algo_bit soundcore evdev i2c_core ehci_hcd sg serio_raw snd_page_alloc loop btrfs

 Pid: 1008, comm: modprobe Not tainted 3.3.0-rc1 #21 LENOVO 20046                           /AMD CRB

 RIP: 0010:[<ffffffff81275b5b>]  [<ffffffff81275b5b>] memcpy+0xb/0x120

 RSP: 0018:ffff8800aa72db00  EFLAGS: 00010246
 RAX: ffff8800a4150000 RBX: 0000000000001000 RCX: 0000000000000087
 RDX: 0000000000000000 RSI: ffff8800a4244000 RDI: ffff8800a4150bc8
 RBP: ffff8800aa72db78 R08: 0000000000000010 R09: ffffffff8174bbec
 R10: ffffffff812ee010 R11: 0000000000000001 R12: 0000000000001000
 R13: 0000000000010000 R14: ffff8800a4140000 R15: ffff8800aaba1800
 FS:  00007ff9a3bd4720(0000) GS:ffff8800afa00000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
 CR2: ffff8800a4244000 CR3: 00000000a9c18000 CR4: 00000000000006f0
 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process modprobe (pid: 1008, threadinfo ffff8800aa72c000, task ffff8800aa0e4000)

 Stack:
 ffffffffa04e7c7b 0000000000000001 0000000000010000 ffff8800aa72db28
 ffffffff00000001 0000000000001000 ffffffff8113cbef 0000000000000020
 ffff8800a4243420 ffff880000000002 ffff8800aa72db08 ffff8800a9d42000
 Call Trace:
 [<ffffffffa04e7c7b>] ? radeon_atrm_get_bios_chunk+0x8b/0xd0 [radeon]
 [<ffffffff8113cbef>] ? kmalloc_order_trace+0x3f/0xb0
 [<ffffffffa04a9298>] radeon_get_bios+0x68/0x2f0 [radeon]
 [<ffffffffa04c7a30>] rv770_init+0x40/0x280 [radeon]
 [<ffffffffa047d740>] radeon_device_init+0x560/0x600 [radeon]
 [<ffffffffa047ef4f>] radeon_driver_load_kms+0xaf/0x170 [radeon]
 [<ffffffffa043cdde>] drm_get_pci_dev+0x18e/0x2c0 [drm]
 [<ffffffffa04e7e95>] radeon_pci_probe+0xad/0xb5 [radeon]
 [<ffffffff81296c5f>] local_pci_probe+0x5f/0xd0
 [<ffffffff81297418>] pci_device_probe+0x88/0xb0
 [<ffffffff813417aa>] ? driver_sysfs_add+0x7a/0xb0
 [<ffffffff813418d8>] really_probe+0x68/0x180
 [<ffffffff81341be5>] driver_probe_device+0x45/0x70
 [<ffffffff81341cb3>] __driver_attach+0xa3/0xb0
 [<ffffffff81341c10>] ? driver_probe_device+0x70/0x70
 [<ffffffff813400ce>] bus_for_each_dev+0x5e/0x90
 [<ffffffff8134172e>] driver_attach+0x1e/0x20
 [<ffffffff81341298>] bus_add_driver+0xc8/0x280
 [<ffffffff813422c6>] driver_register+0x76/0x140
 [<ffffffff812976d6>] __pci_register_driver+0x66/0xe0
 [<ffffffffa043d021>] drm_pci_init+0x111/0x120 [drm]
 [<ffffffff8133c67a>] ? vga_switcheroo_register_handler+0x3a/0x60
 [<ffffffffa0229000>] ? 0xffffffffa0228fff
 [<ffffffffa02290ec>] radeon_init+0xec/0xee [radeon]
 [<ffffffff810002f2>] do_one_initcall+0x42/0x180
 [<ffffffff8109d8d2>] sys_init_module+0x92/0x1e0
 [<ffffffff815407a9>] system_call_fastpath+0x16/0x1b
 Code: 58 2a 43 50 88 43 4e 48 83 c4 08 5b c9 c3 66 90 e8 cb fd ff ff eb

 e6 90 90 90 90 90 90 90 90 90 48 89 f8 89 d1 c1 e9 03 83 e2 07 <f3> 48 a5 89 d1 f3 a4 c3 20 48 83 ea 20 4c 8b 06 4c 8b 4e 08 4c RIP  [<ffffffff81275b5b>] memcpy+0xb/0x120
 RSP <ffff8800aa72db00>
 CR2: ffff8800a4244000

 ---[ end trace fcffa1599cf56382 ]---
Quoted 5 lines
Quoted 5 lines

Call to acpi_evaluate_object() not always returns 4096 bytes chunks, on my system it can return 2048 bytes chunk, so pass the length of retrieved chunk to memcpy(), not the length of the recieving buffer.

Signed-off-by Igor Murzov <[email protected]>

Hi Igor,

I'm not sure I understand, does your BIOS return 2K chunks always or just for the last chunks?

since if it returns 2K always, won't your next patch break stuff?

we have a regression report against the second patch, just wondering what it might be.

Dave.

author
#4 lore raw
Quoted 81 lines · On Wed, 1 Feb 2012 18:42:52 +0000 Dave Airlie <[email protected]> wrote:
Quoted 80 lines · Alex Deucher
Quoted 78 lines · Igor Murzov

From 77c912ea1eca50a93a34d5be69f9dc96a8bef0d8 Mon Sep 17 00:00:00 2001
From: Igor Murzov <[email protected]>
Date: Sun, 22 Jan 2012 19:02:27 +0400
Subject: [PATCH 1/2] drm/radeon: fix invalid memory access in radeon_atrm_get_bios()

At a boot time I observed following bug:

 BUG: unable to handle kernel paging request at ffff8800a4244000
 IP: [<ffffffff81275b5b>] memcpy+0xb/0x120
 PGD 1816063 PUD 1fe7d067 PMD 1ff9f067 PTE 80000000a4244160
 Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
 CPU 0
 Modules linked in: btusb bluetooth brcmsmac brcmutil crc8 cordic b43 radeon(+)

 mac80211 cfg80211 ttm ohci_hcd drm_kms_helper rfkill drm ssb agpgart mmc_core sp5100_tco video battery ac thermal processor rtc_cmos thermal_sys snd_hda_codec_hdmi joydev snd_hda_codec_conexant button bcma pcmcia snd_hda_intel snd_hda_codec snd_hwdep snd_pcm shpchp pcmcia_core k8temp snd_timer atl1c snd psmouse hwmon i2c_piix4 i2c_algo_bit soundcore evdev i2c_core ehci_hcd sg serio_raw snd_page_alloc loop btrfs

 Pid: 1008, comm: modprobe Not tainted 3.3.0-rc1 #21 LENOVO 20046                           /AMD CRB

 RIP: 0010:[<ffffffff81275b5b>]  [<ffffffff81275b5b>] memcpy+0xb/0x120

 RSP: 0018:ffff8800aa72db00  EFLAGS: 00010246
 RAX: ffff8800a4150000 RBX: 0000000000001000 RCX: 0000000000000087
 RDX: 0000000000000000 RSI: ffff8800a4244000 RDI: ffff8800a4150bc8
 RBP: ffff8800aa72db78 R08: 0000000000000010 R09: ffffffff8174bbec
 R10: ffffffff812ee010 R11: 0000000000000001 R12: 0000000000001000
 R13: 0000000000010000 R14: ffff8800a4140000 R15: ffff8800aaba1800
 FS:  00007ff9a3bd4720(0000) GS:ffff8800afa00000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
 CR2: ffff8800a4244000 CR3: 00000000a9c18000 CR4: 00000000000006f0
 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process modprobe (pid: 1008, threadinfo ffff8800aa72c000, task ffff8800aa0e4000)

 Stack:
 ffffffffa04e7c7b 0000000000000001 0000000000010000 ffff8800aa72db28
 ffffffff00000001 0000000000001000 ffffffff8113cbef 0000000000000020
 ffff8800a4243420 ffff880000000002 ffff8800aa72db08 ffff8800a9d42000
 Call Trace:
 [<ffffffffa04e7c7b>] ? radeon_atrm_get_bios_chunk+0x8b/0xd0 [radeon]
 [<ffffffff8113cbef>] ? kmalloc_order_trace+0x3f/0xb0
 [<ffffffffa04a9298>] radeon_get_bios+0x68/0x2f0 [radeon]
 [<ffffffffa04c7a30>] rv770_init+0x40/0x280 [radeon]
 [<ffffffffa047d740>] radeon_device_init+0x560/0x600 [radeon]
 [<ffffffffa047ef4f>] radeon_driver_load_kms+0xaf/0x170 [radeon]
 [<ffffffffa043cdde>] drm_get_pci_dev+0x18e/0x2c0 [drm]
 [<ffffffffa04e7e95>] radeon_pci_probe+0xad/0xb5 [radeon]
 [<ffffffff81296c5f>] local_pci_probe+0x5f/0xd0
 [<ffffffff81297418>] pci_device_probe+0x88/0xb0
 [<ffffffff813417aa>] ? driver_sysfs_add+0x7a/0xb0
 [<ffffffff813418d8>] really_probe+0x68/0x180
 [<ffffffff81341be5>] driver_probe_device+0x45/0x70
 [<ffffffff81341cb3>] __driver_attach+0xa3/0xb0
 [<ffffffff81341c10>] ? driver_probe_device+0x70/0x70
 [<ffffffff813400ce>] bus_for_each_dev+0x5e/0x90
 [<ffffffff8134172e>] driver_attach+0x1e/0x20
 [<ffffffff81341298>] bus_add_driver+0xc8/0x280
 [<ffffffff813422c6>] driver_register+0x76/0x140
 [<ffffffff812976d6>] __pci_register_driver+0x66/0xe0
 [<ffffffffa043d021>] drm_pci_init+0x111/0x120 [drm]
 [<ffffffff8133c67a>] ? vga_switcheroo_register_handler+0x3a/0x60
 [<ffffffffa0229000>] ? 0xffffffffa0228fff
 [<ffffffffa02290ec>] radeon_init+0xec/0xee [radeon]
 [<ffffffff810002f2>] do_one_initcall+0x42/0x180
 [<ffffffff8109d8d2>] sys_init_module+0x92/0x1e0
 [<ffffffff815407a9>] system_call_fastpath+0x16/0x1b
 Code: 58 2a 43 50 88 43 4e 48 83 c4 08 5b c9 c3 66 90 e8 cb fd ff ff eb

 e6 90 90 90 90 90 90 90 90 90 48 89 f8 89 d1 c1 e9 03 83 e2 07 <f3> 48 a5 89 d1 f3 a4 c3 20 48 83 ea 20 4c 8b 06 4c 8b 4e 08 4c RIP  [<ffffffff81275b5b>] memcpy+0xb/0x120
 RSP <ffff8800aa72db00>
 CR2: ffff8800a4244000

 ---[ end trace fcffa1599cf56382 ]---

Call to acpi_evaluate_object() not always returns 4096 bytes chunks, on my system it can return 2048 bytes chunk, so pass the length of retrieved chunk to memcpy(), not the length of the recieving buffer.

Quoted 6 lines
Quoted 1 line
Quoted 1 line
Signed-off-by Igor Murzov <[email protected]>

Hi Igor,

I'm not sure I understand, does your BIOS return 2K chunks always or just for the last chunks?

Only for the last chunk. acpi_evaluate_object() returns 16 x 4Kb chunks
and then 1 x 2Kb on my laptop.
If I revert both my patches (211fa4fc4e13492151e698d92b0dff56b29928ec and a3f83ab1a717c0e6c2f59a4cfdaa10707cc35c55), applying following patch:
-----------------------------------------

drivers/gpu/drm/radeon/radeon_atpx_handler.c +1 -0
index 9d95792..1376b94 100644
@@ -58,6 +58,7 @@ static int radeon_atrm_call(acpi_handle atrm_handle, uint8_t *bios,
        }
 
        obj = (union acpi_object *)buffer.pointer;
+    printk(KERN_DEBUG "XXX len: %u, obj->buffer.length: %u", len, obj->buffer.length);
        memcpy(bios+offset, obj->buffer.pointer, len);
        kfree(buffer.pointer);
        return len;

-----------------------------------------

gave me following result:
-----------------------------------------

# dmesg | grep XXX                                 
[   10.895068] XXX len: 4096, obj->buffer.length: 4096
[   10.998068] XXX len: 4096, obj->buffer.length: 4096
[   11.101065] XXX len: 4096, obj->buffer.length: 4096
[   11.204064] XXX len: 4096, obj->buffer.length: 4096
[   11.307063] XXX len: 4096, obj->buffer.length: 4096
[   11.410065] XXX len: 4096, obj->buffer.length: 4096
[   11.513064] XXX len: 4096, obj->buffer.length: 4096
[   11.616066] XXX len: 4096, obj->buffer.length: 4096
[   11.722072] XXX len: 4096, obj->buffer.length: 4096
[   11.826065] XXX len: 4096, obj->buffer.length: 4096
[   11.929065] XXX len: 4096, obj->buffer.length: 4096
[   12.032065] XXX len: 4096, obj->buffer.length: 4096
[   12.135101] XXX len: 4096, obj->buffer.length: 4096
[   12.239100] XXX len: 4096, obj->buffer.length: 4096
[   12.343098] XXX len: 4096, obj->buffer.length: 4096
[   12.468101] XXX len: 4096, obj->buffer.length: 2048
[   12.552086] XXX len: 4096, obj->buffer.length: 1
[   12.636085] XXX len: 4096, obj->buffer.length: 1
[   12.720089] XXX len: 4096, obj->buffer.length: 1
[   12.804085] XXX len: 4096, obj->buffer.length: 1
[   12.888086] XXX len: 4096, obj->buffer.length: 1
[   12.972088] XXX len: 4096, obj->buffer.length: 1
[   13.056096] XXX len: 4096, obj->buffer.length: 1
[   13.140085] XXX len: 4096, obj->buffer.length: 1
[   13.224088] XXX len: 4096, obj->buffer.length: 1
[   13.308084] XXX len: 4096, obj->buffer.length: 1
[   13.392086] XXX len: 4096, obj->buffer.length: 1
[   13.476089] XXX len: 4096, obj->buffer.length: 1
[   13.560085] XXX len: 4096, obj->buffer.length: 1
[   13.644085] XXX len: 4096, obj->buffer.length: 1
[   13.728090] XXX len: 4096, obj->buffer.length: 1
[   13.812085] XXX len: 4096, obj->buffer.length: 1
[   13.896086] XXX len: 4096, obj->buffer.length: 1
[   13.980088] XXX len: 4096, obj->buffer.length: 1
[   14.064085] XXX len: 4096, obj->buffer.length: 1
[   14.148085] XXX len: 4096, obj->buffer.length: 1
[   14.232089] XXX len: 4096, obj->buffer.length: 1
[   14.316084] XXX len: 4096, obj->buffer.length: 1
[   14.400085] XXX len: 4096, obj->buffer.length: 1
[   14.484089] XXX len: 4096, obj->buffer.length: 1
[   14.568085] XXX len: 4096, obj->buffer.length: 1
[   14.652085] XXX len: 4096, obj->buffer.length: 1
[   14.736089] XXX len: 4096, obj->buffer.length: 1
[   14.820084] XXX len: 4096, obj->buffer.length: 1
[   14.905084] XXX len: 4096, obj->buffer.length: 1
[   14.989088] XXX len: 4096, obj->buffer.length: 1
[   15.073082] XXX len: 4096, obj->buffer.length: 1
[   15.158086] XXX len: 4096, obj->buffer.length: 1
[   15.242089] XXX len: 4096, obj->buffer.length: 1
[   15.326087] XXX len: 4096, obj->buffer.length: 1
[   15.410085] XXX len: 4096, obj->buffer.length: 1
[   15.494088] XXX len: 4096, obj->buffer.length: 1
[   15.578087] XXX len: 4096, obj->buffer.length: 1
[   15.662086] XXX len: 4096, obj->buffer.length: 1
[   15.746088] XXX len: 4096, obj->buffer.length: 1
[   15.830086] XXX len: 4096, obj->buffer.length: 1
[   15.914084] XXX len: 4096, obj->buffer.length: 1
[   15.998087] XXX len: 4096, obj->buffer.length: 1
[   16.082086] XXX len: 4096, obj->buffer.length: 1
[   16.166086] XXX len: 4096, obj->buffer.length: 1
[   16.250087] XXX len: 4096, obj->buffer.length: 1
[   16.334084] XXX len: 4096, obj->buffer.length: 1
[   16.418086] XXX len: 4096, obj->buffer.length: 1
[   16.502088] XXX len: 4096, obj->buffer.length: 1
-----------------------------------------

-- Igor