[uml-devel] Re: Security patches 1- 3

[uml-devel] Re: Security patches 1- 3

[Bodo Stroesser]

Paolo Giarrusso wrote:
> 
> Ok, I guess I have understood you. I could insert it, but first I would like 
> to have it tested. However, for now -v6 is released with the other change you 
> posted.
> 
Today I installed a 2.6.7-skas3.v6 host. And I adapted and applied also the patch
from bitkeeper. For me, this combination works fine. So here is the slightly
modified patch.

Bodo

----

# Modified to apply to Linux-2.6.7 + host-skas3-2.6.7-v6.patch
#
#
# This is a BitKeeper generated diff -Nru style patch.
#
# ChangeSet
#   2004/09/08 07:49:36-07:00 roland@redhat.com
#   [PATCH] i386 syscall tracing of bogus system calls
#
#   In 2.4, strace will show you all bogus system calls a process tries.  In
#   2.6, it only shows you stubs < __NR_syscalls, and there is no tracing stop
#   for large bogus system call numbers.  I can't see why this was changed, so
#   I am assuming it was accidental.
#
#   This patch restores the expected behavior that syscall tracing shows every
#   bogus syscall attempt.
#
#   Signed-off-by: Roland McGrath <roland@redhat.com>
#   Signed-off-by: Andrew Morton <akpm@osdl.org>
#   Signed-off-by: Linus Torvalds <torvalds@osdl.org>
#
# arch/i386/kernel/entry.S
#   2004/09/08 07:49:29-07:00 roland@redhat.com +4 -4
#   i386 syscall tracing of bogus system calls
#
diff -Nru a/arch/i386/kernel/entry.S b/arch/i386/kernel/entry.S
--- a/arch/i386/kernel/entry.S	2004-10-19 02:40:35 -07:00
+++ b/arch/i386/kernel/entry.S	2004-10-19 02:40:35 -07:00
@@ -255,11 +255,11 @@
  	pushl %eax
  	SAVE_ALL
  	GET_THREAD_INFO(%ebp)
-	cmpl $(nr_syscalls), %eax
-	jae syscall_badsys

  	testb $(_TIF_SYSCALL_EMU|_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT),TI_flags(%ebp)
  	jnz syscall_trace_entry
+	cmpl $(nr_syscalls), %eax
+	jae syscall_badsys
  	call *sys_call_table(,%eax,4)
  	movl %eax,EAX(%esp)
  	cli
@@ -278,11 +278,11 @@
  	pushl %eax			# save orig_eax
  	SAVE_ALL
  	GET_THREAD_INFO(%ebp)
-	cmpl $(nr_syscalls), %eax
-	jae syscall_badsys
  					# system call tracing in operation / emulation
  	testb $(_TIF_SYSCALL_EMU|_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT),TI_flags(%ebp)
  	jnz syscall_trace_entry
+	cmpl $(nr_syscalls), %eax
+	jae syscall_badsys
  syscall_call:
  	call *sys_call_table(,%eax,4)
  	movl %eax,EAX(%esp)		# store the return value


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