Re: [PATCH] ALERT!! - 2.2.x i386 Linux kernel has DoS same as 2.4.x!!!!
On Tuesday 19 November 2002 23:13, Matthew Grant wrote:
Hi Matt,
> Here is the patch to fix 2.2:
consider using this instead.
--
Kind regards
Marc-Christian Petersen
http://sourceforge.net/projects/wolk
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Key available at www.keyserver.net. Encrypted e-mail preferred.diff -urN linux.orig/arch/i386/kernel/entry.S linux/arch/i386/kernel/entry.S
--- linux.orig/arch/i386/kernel/entry.S Tue May 21 01:32:34 2002
+++ linux/arch/i386/kernel/entry.S Thu Nov 14 21:39:36 2002
@@ -63,7 +63,9 @@
OLDSS = 0x38
CF_MASK = 0x00000001
+TF_MASK = 0x00000100
IF_MASK = 0x00000200
+DF_MASK = 0x00000400
NT_MASK = 0x00004000
VM_MASK = 0x00020000
@@ -139,6 +141,9 @@
movl CS(%esp),%edx # this is eip..
movl EFLAGS(%esp),%ecx # and this is cs..
movl %eax,EFLAGS(%esp) #
+ andl $~(NT_MASK|TF_MASK|DF_MASK), %eax
+ pushl %eax
+ popfl
movl %edx,EIP(%esp) # Now we move them to their "normal" places
movl %ecx,CS(%esp) #
movl %esp,%ebx
@@ -256,6 +261,9 @@
pushl $ SYMBOL_NAME(do_divide_error)
ALIGN
error_code:
+ pushfl
+ andl $~(NT_MASK|TF_MASK|DF_MASK), (%esp)
+ popfl
pushl %ds
pushl %eax
xorl %eax,%eax
@@ -266,7 +274,6 @@
decl %eax # eax = -1
pushl %ecx
pushl %ebx
- cld
movl %es,%cx
movl ORIG_EAX(%esp), %esi # get the error code
movl ES(%esp), %edi # get the function address
diff -urN linux.orig/arch/i386/kernel/traps.c linux/arch/i386/kernel/traps.c
--- linux.orig/arch/i386/kernel/traps.c Thu Nov 14 21:19:40 2002
+++ linux/arch/i386/kernel/traps.c Thu Nov 14 21:40:01 2002
@@ -601,7 +601,7 @@
return;
clear_TF:
- regs->eflags &= ~TF_MASK;
+ regs->eflags &= ~(TF_MASK|NT_MASK);
return;
}
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