From: Brian Gerst <bgerst@didntduck.org>
To: Matthias Andree <matthias.andree@gmx.de>
Cc: Linux-Kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: cat /proc/bus/pnp/escd -> kernel segfault (2.6 BK)
Date: Mon, 27 Oct 2003 12:22:32 -0500 [thread overview]
Message-ID: <3F9D5458.9010704@didntduck.org> (raw)
In-Reply-To: <20031027044204.GA23976@merlin.emma.line.org>
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Matthias Andree wrote:
> Doing cat /proc/bus/pnp/escd on my Linux 2.6 (BK) crashes:
>
> Unable to handle kernel paging request at virtual address ffffa00a
> printing eip:
> 00007228
> *pde = 00002067
> *pte = 00000000
> Oops: 0000 [#2]
> CPU: 0
> EIP: 0098:[<00007228>] Not tainted
> EFLAGS: 00010086
> EIP is at 0x7228
> eax: 000022ff ebx: 00b06196 ecx: 000000a0 edx: 00000000
> esi: 0000000a edi: d1e70000 ebp: d1e773cf esp: d1e79e64
> ds: 00b0 es: 00a8 ss: 0068
> Process cat (pid: 23647, threadinfo=d1e78000 task=c43f6c80)
> Stack: 000a0002 00b00000 000600a8 73d9720a 00000000 5f0a00a0 61af9e98 007b0000
> 8000007b 60040000 008200a8 d1e79eec 0090000b 00000042 00b000a8 000000a0
> 00000000 c0220c50 00000060 00000082 00000000 00000000 0000007b 0000007b
> Call Trace:
> [<c0220c50>] __pnp_bios_read_escd+0x110/0x1a0
> [<c0222080>] proc_read_escd+0x0/0x130
> [<c0220cf9>] pnp_bios_read_escd+0x19/0x50
> [<c0222080>] proc_read_escd+0x0/0x130
> [<c02220ea>] proc_read_escd+0x6a/0x130
> [<c0222080>] proc_read_escd+0x0/0x130
> [<c018896e>] proc_file_read+0x16e/0x290
> [<c0157e63>] vfs_read+0xd3/0x140
> [<c015811f>] sys_read+0x3f/0x60
> [<c010a41b>] syscall_call+0x7/0xb
>
> Willing to provide further debug info, please send directions. This is
> an old Gigabyte 7ZX-R board (AMIBIOS).
>
Does this patch fix it?
--
Brian Gerst
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diff -urN linux-2.6.0-test9-bk/arch/i386/mm/extable.c linux/arch/i386/mm/extable.c
--- linux-2.6.0-test9-bk/arch/i386/mm/extable.c 2003-07-27 13:11:40.000000000 -0400
+++ linux/arch/i386/mm/extable.c 2003-10-27 12:08:38.000000000 -0500
@@ -34,7 +34,7 @@
const struct exception_table_entry *fixup;
#ifdef CONFIG_PNPBIOS
- if (unlikely((regs->xcs | 8) == 0x88)) /* 0x80 or 0x88 */
+ if (unlikely((unsigned)(regs->xcs - (GDT_ENTRY_PNPBIOS_BASE * 8)) < 16))
{
extern u32 pnp_bios_fault_eip, pnp_bios_fault_esp;
extern u32 pnp_bios_is_utter_crap;
next prev parent reply other threads:[~2003-10-27 17:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-27 4:42 cat /proc/bus/pnp/escd -> kernel segfault (2.6 BK) Matthias Andree
2003-10-27 17:22 ` Brian Gerst [this message]
2003-10-27 19:13 ` Matthias Andree
2003-10-28 1:49 ` Maciej Babinski
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