kernel: Activate FORTIFY_SOURCE for MIPS kernel 5.4

CONFIG_FORTIFY_SOURCE=y is already set in the generic kernel
configuration, but it is not working for MIPS on kernel 5.4, support for
MIPS was only added with kernel 5.5, other architectures like aarch64
support FORTIFY_SOURCE already since some time.

This patch adds support for FORTIFY_SOURCE to MIPS with kernel 5.4,
kernel 5.10 already supports this and needs no changes.

This backports one patch from kernel 5.5 and one fix from 5.8 to make
fortify source also work on our kernel 5.4.

The changes are not compatible with the
306-mips_mem_functions_performance.patch patch which was also removed
with kernel 5.10, probably because of the same problems. I think it is
not needed anyway as the compiler should automatically optimize the
calls to memset(), memcpy() and memmove() even when not explicitly
telling the compiler to use the build in variant.

This increases the size of an uncompressed kernel by less than 1 KB.

Acked-by: Rosen Penev <rosenp@gmail.com>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 32 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.4/310-mips-Kconfig-Add-ARCH_HAS_FORTIFY_SOURCE.patch b/target/linux/generic/backport-5.4/310-mips-Kconfig-Add-ARCH_HAS_FORTIFY_SOURCE.patch
new file mode 100644
index 0000000000..e02f103543
--- /dev/null
+++ b/target/linux/generic/backport-5.4/310-mips-Kconfig-Add-ARCH_HAS_FORTIFY_SOURCE.patch
@@ -0,0 +1,32 @@
+From a8d2bb0559b5fefa5173ff4e7496cc6250db2c8a Mon Sep 17 00:00:00 2001
+From: Dmitry Korotin <dkorotin@wavecomp.com>
+Date: Thu, 12 Sep 2019 22:53:45 +0000
+Subject: [PATCH] mips: Kconfig: Add ARCH_HAS_FORTIFY_SOURCE
+
+FORTIFY_SOURCE detects various overflows at compile and run time.
+(6974f0c4555e ("include/linux/string.h:
+add the option of fortified string.h functions)
+
+ARCH_HAS_FORTIFY_SOURCE means that the architecture can be built and
+run with CONFIG_FORTIFY_SOURCE.
+
+Since mips can be built and run with that flag,
+select ARCH_HAS_FORTIFY_SOURCE as default.
+
+Signed-off-by: Dmitry Korotin <dkorotin@wavecomp.com>
+Signed-off-by: Paul Burton <paul.burton@mips.com>
+Cc: linux-mips@vger.kernel.org
+---
+ arch/mips/Kconfig | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/arch/mips/Kconfig
++++ b/arch/mips/Kconfig
+@@ -7,6 +7,7 @@ config MIPS
+ 	select ARCH_CLOCKSOURCE_DATA
+ 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
+ 	select ARCH_HAS_UBSAN_SANITIZE_ALL
++	select ARCH_HAS_FORTIFY_SOURCE
+ 	select ARCH_SUPPORTS_UPROBES
+ 	select ARCH_USE_BUILTIN_BSWAP
+ 	select ARCH_USE_CMPXCHG_LOCKREF if 64BIT