linux-kernel - [PATCH 2/2] ARM: add malloc size to decompressor kexec size structure

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Date:   Thu, 06 Aug 2020 11:12:28 +0100
From:   Russell King <rmk+kernel@...linux.org.uk>
To:     Norbert Lange <nolange79@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Petr Malat <oss@...at.biz>, Kees Cook <keescook@...omium.org>,
        Adam Borowski <kilobyte@...band.pl>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nick Terrell <terrelln@...com>,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 2/2] ARM: add malloc size to decompressor kexec size structure

Add the required malloc size to the decompressor kexec size structure.

Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
---
 arch/arm/boot/compressed/Makefile      | 5 ++++-
 arch/arm/boot/compressed/head.S        | 4 ++--
 arch/arm/boot/compressed/vmlinux.lds.S | 3 ++-
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index 0890d82b8cf4..432af49ddbcb 100644
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -7,7 +7,6 @@
 
 OBJS		=
 
-AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET)
 HEAD	= head.o
 OBJS	+= misc.o decompress.o
 ifeq ($(CONFIG_DEBUG_UNCOMPRESS),y)
@@ -69,8 +68,12 @@ ZTEXTADDR	:= 0
 ZBSSADDR	:= ALIGN(8)
 endif
 
+MALLOC_SIZE	:= 65536
+
+AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET) -DMALLOC_SIZE=$(MALLOC_SIZE)
 CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)"
 CPPFLAGS_vmlinux.lds += -DTEXT_OFFSET="$(TEXT_OFFSET)"
+CPPFLAGS_vmlinux.lds += -DMALLOC_SIZE="$(MALLOC_SIZE)"
 
 compress-$(CONFIG_KERNEL_GZIP) = gzip
 compress-$(CONFIG_KERNEL_LZO)  = lzo
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index 7f24f0852a94..2ea4521bf7df 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -299,7 +299,7 @@ restart:	adr	r0, LC1
 
 #ifndef CONFIG_ZBOOT_ROM
 		/* malloc space is above the relocated stack (64k max) */
-		add	r10, sp, #0x10000
+		add	r10, sp, #MALLOC_SIZE
 #else
 		/*
 		 * With ZBOOT_ROM the bss/stack is non relocatable,
@@ -610,7 +610,7 @@ not_relocated:	mov	r0, #0
  */
 		mov	r0, r4
 		mov	r1, sp			@ malloc space above stack
-		add	r2, sp, #0x10000	@ 64k max
+		add	r2, sp, #MALLOC_SIZE	@ 64k max
 		mov	r3, r7
 		bl	decompress_kernel
 
diff --git a/arch/arm/boot/compressed/vmlinux.lds.S b/arch/arm/boot/compressed/vmlinux.lds.S
index da1f6fa5345b..0ed4d82d3782 100644
--- a/arch/arm/boot/compressed/vmlinux.lds.S
+++ b/arch/arm/boot/compressed/vmlinux.lds.S
@@ -42,11 +42,12 @@ SECTIONS
   }
   .table : ALIGN(4) {
     _table_start = .;
-    LONG(ZIMAGE_MAGIC(5))
+    LONG(ZIMAGE_MAGIC(6))
     LONG(ZIMAGE_MAGIC(0x5a534c4b))
     LONG(ZIMAGE_MAGIC(__piggy_size_addr - _start))
     LONG(ZIMAGE_MAGIC(_kernel_bss_size))
     LONG(ZIMAGE_MAGIC(TEXT_OFFSET))
+    LONG(ZIMAGE_MAGIC(MALLOC_SIZE))
     LONG(0)
     _table_end = .;
   }
-- 
2.20.1