[linux] 01/03: [mips*/octeon] Add support for byte swapped initramfs to handle u-boot and kernel running with a different endianness.
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debian-kernel at lists.debian.org
Fri May 13 17:27:40 UTC 2016
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aurel32 pushed a commit to branch sid
in repository linux.
commit 4a8b374466940239cd7c2a78446882bc4b2e9306
Author: Aurelien Jarno <aurelien at aurel32.net>
Date: Fri May 13 18:54:45 2016 +0200
[mips*/octeon] Add support for byte swapped initramfs to handle u-boot and kernel running with a different endianness.
---
debian/changelog | 2 +
...eon-detect-and-fix-byte-swapped-initramfs.patch | 83 ++++++++++++++++++++++
debian/patches/series | 1 +
3 files changed, 86 insertions(+)
diff --git a/debian/changelog b/debian/changelog
index 7ee7563..8f84100 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -84,6 +84,8 @@ linux (4.5.4-1) UNRELEASED; urgency=medium
* [mips*] Fix PR_SET_FPMODE issues with multi-threaded programs.
* [i386] Stop recommending libc6-i686.
* [arm,x86] Fix memory corruption in KVM with THP enabled.
+ * [mips*/octeon] Add support for byte swapped initramfs to handle u-boot and
+ kernel running with a different endianness.
[ Roger Shimizu ]
* netfilter: Enable NF_DUP_NETDEV / NFT_DUP_NETDEV / NFT_FWD_NETDEV
diff --git a/debian/patches/features/mips/MIPS-Octeon-detect-and-fix-byte-swapped-initramfs.patch b/debian/patches/features/mips/MIPS-Octeon-detect-and-fix-byte-swapped-initramfs.patch
new file mode 100644
index 0000000..15ad40b
--- /dev/null
+++ b/debian/patches/features/mips/MIPS-Octeon-detect-and-fix-byte-swapped-initramfs.patch
@@ -0,0 +1,83 @@
+From: Aurelien Jarno <aurelien at aurel32.net>
+Date: Wed, 11 May 2016 00:37:42 +0200
+Subject: MIPS: Octeon: detect and fix byte swapped initramfs
+Origin: https://patchwork.linux-mips.org/patch/13219/
+
+Octeon machines support running in little endian mode. U-Boot usually
+runs in big endian-mode. Therefore the initramfs is loaded in big endian
+mode, and the kernel later tries to access it in little endian mode.
+
+This patch fixes that by detecting byte swapped initramfs using either the
+CPIO header or the header from standard compression methods, and
+byte swaps it if needed. It first checks that the header doesn't match
+in the native endianness to avoid false detections. It uses the kernel
+decompress library so that we don't have to maintain the list of magics
+if some decompression methods are added to the kernel.
+
+Cc: Ralf Baechle <ralf at linux-mips.org>
+Acked-by: David Daney <david.daney at cavium.com>
+Signed-off-by: Aurelien Jarno <aurelien at aurel32.net>
+---
+ arch/mips/kernel/setup.c | 32 ++++++++++++++++++++++++++++++++
+ 1 file changed, 32 insertions(+)
+
+diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
+index 4f60734..8841d7982 100644
+--- a/arch/mips/kernel/setup.c
++++ b/arch/mips/kernel/setup.c
+@@ -26,6 +26,7 @@
+ #include <linux/sizes.h>
+ #include <linux/device.h>
+ #include <linux/dma-contiguous.h>
++#include <linux/decompress/generic.h>
+
+ #include <asm/addrspace.h>
+ #include <asm/bootinfo.h>
+@@ -250,6 +251,35 @@ disable:
+ return 0;
+ }
+
++/* In some conditions (e.g. big endian bootloader with a little endian
++ kernel), the initrd might appear byte swapped. Try to detect this and
++ byte swap it if needed. */
++static void __init maybe_bswap_initrd(void)
++{
++#if defined(CONFIG_CPU_CAVIUM_OCTEON)
++ u64 buf;
++
++ /* Check for CPIO signature */
++ if (!memcmp((void *)initrd_start, "070701", 6))
++ return;
++
++ /* Check for compressed initrd */
++ if (decompress_method((unsigned char *)initrd_start, 8, NULL))
++ return;
++
++ /* Try again with a byte swapped header */
++ buf = swab64p((u64 *)initrd_start);
++ if (!memcmp(&buf, "070701", 6) ||
++ decompress_method((unsigned char *)(&buf), 8, NULL)) {
++ unsigned long i;
++
++ pr_info("Byteswapped initrd detected\n");
++ for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
++ swab64s((u64 *)i);
++ }
++#endif
++}
++
+ static void __init finalize_initrd(void)
+ {
+ unsigned long size = initrd_end - initrd_start;
+@@ -263,6 +293,8 @@ static void __init finalize_initrd(void)
+ goto disable;
+ }
+
++ maybe_bswap_initrd();
++
+ reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
+ initrd_below_start_ok = 1;
+
+--
+2.8.1
+
diff --git a/debian/patches/series b/debian/patches/series
index 8e8976e..8f0bc96 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -61,6 +61,7 @@ features/mips/MIPS-Loongson-3-Add-Loongson-LS3A-RS780E-1-way-machi.patch
features/mips/MIPS-octeon-Add-support-for-the-UBNT-E200-board.patch
features/mips/libata-support-AHCI-on-OCTEON-platform.patch
features/mips/MIPS-Octeon-Add-Octeon-III-CN7xxx-interface-detection.patch
+features/mips/MIPS-Octeon-detect-and-fix-byte-swapped-initramfs.patch
features/x86/x86-memtest-WARN-if-bad-RAM-found.patch
features/x86/x86-make-x32-syscall-support-conditional.patch
features/sparc/hwrng-n2-attach-on-t5-m5-t7-m7-sparc-cpus.patch
--
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