Since we no longer support GCC 2.x, could that code perhaps be simplified by taking advantage of tags?
--david On 9/6/05, Chen, Kenneth W <[EMAIL PROTECTED]> wrote: > The exception handler in copy user always expects fault occurs only on > user space address and the fall back recovery code is written with that > very assumption in mind. Recent source code inspection revealed that > while it worked splendid and to the expectation under normal circumstances, > It broke down under unexpected condition where some address calculation > might go outside the legal address range the original copy_user was > called for. This patch is to make copy_user exception handler more robust > and to prevent potential memory corruption. > > > Signed-off-by: Ken Chen <[EMAIL PROTECTED]> > > > --- linux-2.6.13/arch/ia64/lib/memcpy_mck.S.orig 2005-09-06 > 15:15:29.560795174 -0700 > +++ linux-2.6.13/arch/ia64/lib/memcpy_mck.S 2005-09-06 15:21:46.798095240 > -0700 > @@ -625,8 +625,11 @@ EK(.ex_handler, (p17) st8 [dst1]=r39,8) > clrrrb > ;; > alloc saved_pfs_stack=ar.pfs,3,3,3,0 > + cmp.lt p8,p0=A,r0 > sub B = dst0, saved_in0 // how many byte copied so far > ;; > +(p8) mov A = 0; // A shouldn't be negative, cap it > + ;; > sub C = A, B > sub D = saved_in2, A > ;; > > - > To unsubscribe from this list: send the line "unsubscribe linux-ia64" in > the body of a message to [EMAIL PROTECTED] > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- Mosberger Consulting LLC, voice/fax: 510-744-9372, http://www.mosberger-consulting.com/ 35706 Runckel Lane, Fremont, CA 94536 - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
