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| author | Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> | 2009-08-20 20:23:11 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-08-21 16:40:30 +0200 |
| commit | 8126dec32738421afa362114337331337b4be17f (patch) | |
| tree | 2de6e2c7f543d2b750ab5402ec8046d9b929211f /arch | |
| parent | fc0ce23506d943b9eaa731a051769d0e0605eb03 (diff) | |
| download | kernel-crypto-8126dec32738421afa362114337331337b4be17f.tar.gz kernel-crypto-8126dec32738421afa362114337331337b4be17f.tar.xz kernel-crypto-8126dec32738421afa362114337331337b4be17f.zip | |
x86: Fix system crash when loading with "reservetop" parameter
The system will die if the kernel is booted with "reservetop"
parameter, in present code, parse "reservetop" parameter after
early_ioremap_init(), and some function still use
early_ioremap() after it.
The problem is, "reservetop" parameter can modify
'FIXADDR_TOP', then the virtual address got by early_ioremap()
is base on old 'FIXADDR_TOP', but the page mapping is base on
new 'FIXADDR_TOP', it will occur page fault, and the IDT is not
prepare yet, so, the system is dead.
So, put parse_early_param() in the front of
early_ioremap_init() in this patch.
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Cc: yinghai@kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <4A8D402F.4080805@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/setup.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 63f32d220ef..02643cc3bf2 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -711,6 +711,11 @@ void __init setup_arch(char **cmdline_p) printk(KERN_INFO "Command line: %s\n", boot_command_line); #endif + strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); + *cmdline_p = command_line; + + parse_early_param(); + /* VMI may relocate the fixmap; do this before touching ioremap area */ vmi_init(); @@ -793,11 +798,6 @@ void __init setup_arch(char **cmdline_p) #endif #endif - strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); - *cmdline_p = command_line; - - parse_early_param(); - #ifdef CONFIG_X86_64 check_efer(); #endif |