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Subject[PATCH] [WATCHDOG] [hpwdt] Set the mapped BIOS address space as executable
Date
The address provided by the SMBIOS/DMI CRU information is mapped via
ioremap() in the virtual address space. However, since the address
is executed (i.e. call'd), we need to set that pages as executable.

Without that, I get following oops on a HP ProLiant DL385 G2
machine with BIOS from 05/29/2008 when I trigger crashdump:

BUG: unable to handle kernel paging request at ffffc20011090c00
IP: [<ffffc20011090c00>] 0xffffc20011090c00
PGD 12f813067 PUD 7fe6a067 PMD 7effe067 PTE 80000000fffd3173
Oops: 0011 [1] SMP
last sysfs file: /sys/devices/system/cpu/cpu3/cache/index2/shared_cpu_map
CPU 1
Modules linked in: autofs4 ipv6 af_packet cpufreq_conservative cpufreq_userspace
cpufreq_powersave powernow_k8 fuse loop dm_mod rtc_cmos ipmi_si sg rtc_core i2c
_piix4 ipmi_msghandler bnx2 sr_mod container button i2c_core hpilo joydev pcspkr
rtc_lib shpchp hpwdt cdrom pci_hotplug usbhid hid ff_memless ohci_hcd ehci_hcd
uhci_hcd usbcore edd ext3 mbcache jbd fan ide_pci_generic serverworks ide_core p
ata_serverworks pata_acpi cciss ata_generic libata scsi_mod dock thermal process
or thermal_sys hwmon
Supported: Yes
Pid: 0, comm: swapper Not tainted 2.6.27.5-HEAD_20081111100657-default #1
RIP: 0010:[<ffffc20011090c00>] [<ffffc20011090c00>] 0xffffc20011090c00
RSP: 0018:ffff88012f6f9e68 EFLAGS: 00010046
RAX: 0000000000000d02 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88012f6f9e98 R08: 666666666666660a R09: ffffffffa1006fc0
R10: 0000000000000000 R11: ffff88012f6f3ea8 R12: ffffc20011090c00
R13: ffff88012f6f9ee8 R14: 000000000000000e R15: 0000000000000000
FS: 00007ff70b29a6f0(0000) GS:ffff88012f6512c0(0000) knlGS:0000000000000000
CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: ffffc20011090c00 CR3: 0000000000201000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process swapper (pid: 0, threadinfo ffff88012f6f2000, task ffff88007fa8a1c0)
Stack: ffffffffa0f8502b 0000000000000002 ffffffff80738d50 0000000000000000
0000000000000046 0000000000000046 00000000fffffffe ffffffffa0f852ec
0000000000000000 ffffffff804ad9a6 0000000000000000 0000000000000000
Call Trace:
Inexact backtrace:
<NMI> [<ffffffffa0f8502b>] ? asminline_call+0x2b/0x55 [hpwdt]
[<ffffffffa0f852ec>] hpwdt_pretimeout+0x3c/0xa0 [hpwdt]
[<ffffffff804ad9a6>] ? notifier_call_chain+0x29/0x4c
[<ffffffff802587e4>] ? notify_die+0x2d/0x32
[<ffffffff804abbdc>] ? default_do_nmi+0x53/0x1d9
[<ffffffff804abd90>] ? do_nmi+0x2e/0x43
[<ffffffff804ab552>] ? nmi+0xa2/0xd0
[<ffffffff80221ef9>] ? native_safe_halt+0x2/0x3
<<EOE>> [<ffffffff8021345d>] ? default_idle+0x38/0x54
[<ffffffff8021359a>] ? c1e_idle+0x118/0x11c
[<ffffffff8020b3b5>] ? cpu_idle+0xa9/0xf1

Code: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff <55> 50 e8 00 00 00 00 58 48 2d 07 10 40 00 48 8b e8 58 e9 68 02
RIP [<ffffc20011090c00>] 0xffffc20011090c00
RSP <ffff88012f6f9e68>
CR2: ffffc20011090c00
Kernel panic - not syncing: Fatal exception

Signed-off-by: Bernhard Walle <bwalle@suse.de>
---
drivers/watchdog/hpwdt.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index 9890dff..e83e1ac 100644
--- a/drivers/watchdog/hpwdt.c
+++ b/drivers/watchdog/hpwdt.c
@@ -40,6 +40,7 @@
#include <linux/bootmem.h>
#include <linux/slab.h>
#include <asm/desc.h>
+#include <asm/cacheflush.h>

#define PCI_BIOS32_SD_VALUE 0x5F32335F /* "_32_" */
#define CRU_BIOS_SIGNATURE_VALUE 0x55524324
@@ -394,6 +395,8 @@ static void __devinit dmi_find_cru(const struct dmi_header *dm)
smbios_cru64_ptr->double_offset;
cru_rom_addr = ioremap(cru_physical_address,
smbios_cru64_ptr->double_length);
+ set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
+ smbios_cru64_ptr->double_length >> PAGE_SHIFT);
}
}
}
--
1.6.0.2


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