Hi,
This is a patch series to CVE-2021-21781.
The patch 9c698bff66ab ("RM: ensure the signal page contains defined
contents") depepds on memset32. However, this function is not provided
in 4.4 and 4.9. Therefore, we need the patch 3b3c4babd898 ("lib/string.c:
add multibyte memset functions") to apply this feature.
Another option is to implement only the memset32 function in
arch/arm/kernel/signal.c only or using loop memset, but for simplicity
we have taken the way of applying the original patch 3b3c4babd898
("lib/string.c: add multibyte memset functions") that provides memset32
in mainline kernel.
Best regards,
Nobuhiro
Matthew Wilcox (1):
lib/string.c: add multibyte memset functions
Russell King (1):
ARM: ensure the signal page contains defined contents
arch/arm/kernel/signal.c | 14 +++++----
include/linux/string.h | 30 ++++++++++++++++++
lib/string.c | 66 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 104 insertions(+), 6 deletions(-)
--
2.32.0
>From 97cc3a4817c982954ff69355d2577a92bddbad4a Mon Sep 17 00:00:00 2001
From: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@xxxxxxxxxxxxx>
Date: Fri, 30 Jul 2021 14:40:55 +0900
Subject: [RFC/PATCH 0/2] Backports CVE-2021-21781 for 4.4 and 4.9
Hi,
This is a patch series to CVE-2021-21781.
The patch 9c698bff66ab ("RM: ensure the signal page contains defined
contents") depepds on memset32. However, this function is not provided
in 4.4 and 4.9. Therefore, we need the patch 3b3c4babd898 ("lib/string.c:
add multibyte memset functions") to apply this feature.
Another option is to implement only the memset32 function in
arch/arm/kernel/signal.c only, but for simplicity we have taken the
way of applying the original patch 3b3c4babd898 ("lib/string.c: add
multibyte memset functions") that provides memset32 in mainline kernel.
Best regards,
Nobuhiro
Matthew Wilcox (1):
lib/string.c: add multibyte memset functions
Russell King (1):
ARM: ensure the signal page contains defined contents
arch/arm/kernel/signal.c | 23 ++++++++++----
include/linux/string.h | 30 ++++++++++++++++++
lib/string.c | 66 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 113 insertions(+), 6 deletions(-)
--
2.32.0
