The patch titled Subject: syscalls-x86-add-__nr_kcmp-syscall-v8 comment update has been removed from the -mm tree. Its filename was syscalls-x86-add-__nr_kcmp-syscall-v8-comment-update.patch This patch was dropped because it was folded into syscalls-x86-add-__nr_kcmp-syscall-v8.patch The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ From: Cyrill Gorcunov <gorcunov@xxxxxxxxxx> Subject: syscalls-x86-add-__nr_kcmp-syscall-v8 comment update Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- kernel/kcmp.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff -puN kernel/kcmp.c~syscalls-x86-add-__nr_kcmp-syscall-v8-comment-update kernel/kcmp.c --- a/kernel/kcmp.c~syscalls-x86-add-__nr_kcmp-syscall-v8-comment-update +++ a/kernel/kcmp.c @@ -18,6 +18,17 @@ * reasons, still the comparison results should be suitable for * sorting. Thus, we obfuscate kernel pointers values and compare * the production instead. + * + * The obfuscation is done in two steps. First -- we use xor on + * kernel pointer with random value, which puts pointer into + * a new position in reordered space. Second -- we multiply + * the xor production with big odd random number to permute + * bits even more (the odd multiplier guarantees that the product + * is unique ever after the high bits are truncated, since any odd + * number is relative prime to 2^n). + * + * Note also the obfuscation itself is invisible to user-space + * and if needed it can be changed to any suitable scheme. */ static unsigned long cookies[KCMP_TYPES][2] __read_mostly; _ Patches currently in -mm which might be from gorcunov@xxxxxxxxxx are origin.patch sethostname-setdomainname-notify-userspace-when-there-is-a-change-in-uts_kern_table.patch pidns-use-task_active_pid_ns-in-do_notify_parent.patch pidns-make-killed-children-autoreap.patch sysctl-make-kernelns_last_pid-control-being-checkpoint_restore-dependent.patch fs-proc-introduce-proc-pid-task-tid-children-entry-v9.patch syscalls-x86-add-__nr_kcmp-syscall-v8.patch syscalls-x86-add-__nr_kcmp-syscall-v8-comment-update-fix.patch c-r-procfs-add-arg_start-end-env_start-end-and-exit_code-members-to-proc-pid-stat.patch c-r-prctl-extend-pr_set_mm-to-set-up-more-mm_struct-entries-v2.patch c-r-prctl-add-ability-to-set-new-mm_struct-exe_file.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html