[lkml]   [2001]   [May]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [CHECKER] 4 security holes in 2.4.4-ac8
On 30 May 2001 11:38:13 +0200, 
Andi Kleen <> wrote:
>"David S. Miller" <> writes:
>> Dawson Engler writes:
>> > Is there any way to automatically find these? E.g., is any routine
>> > with "asmlinkage" callable from user space?
>> This is only universally done in generic and x86 specific code,
>> other ports tend to forget asmlinkage simply because most ports
>> don't need it.
>Even i386 doesn't need it because the stack frame happens to have the
>right order of the arguments at the right position. Just you can get into
>weird bugs when any function modifies their argument because it'll be still
>modified after syscall restart but only depending if the compiler used a
>temporary register or not.

For IA64 you *must* use asmlinkage because the first 8 parameters are
passed in registers. gcc will happily modify the register values which
will mess up syscall restart, unless you use asmlinkage to force gcc to
take copies of parameters and modify the copies.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 12:54    [W:0.036 / U:0.552 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site