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
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