[U-Boot] [PATCH] lmb: handle more than one DRAM BANK

[Simon Goldschmidt]

This fixes the automatic lmb initialization and reservation for boards
with more than one DRAM bank.

This fixes the CVE-2018-18439 and -18440 fixes that only allowed to load
files into the firs DRAM bank from fs and via tftp.

Found-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt at gmail.com>
---

 common/bootm.c |  4 ++--
 fs/fs.c        |  3 +--
 include/lmb.h  |  7 +++++--
 lib/lmb.c      | 37 ++++++++++++++++++++++++++++++++-----
 net/tftp.c     |  3 +--
 5 files changed, 41 insertions(+), 13 deletions(-)

diff --git a/common/bootm.c b/common/bootm.c
index a4618b6d2e..7c7505f092 100644
--- a/common/bootm.c
+++ b/common/bootm.c
@@ -59,8 +59,8 @@ static void boot_start_lmb(bootm_headers_t *images)
 	mem_start = env_get_bootm_low();
 	mem_size = env_get_bootm_size();
 
-	lmb_init_and_reserve(&images->lmb, (phys_addr_t)mem_start, mem_size,
-			     NULL);
+	lmb_init_and_reserve_range(&images->lmb, (phys_addr_t)mem_start,
+				   mem_size, NULL);
 }
 #else
 #define lmb_reserve(lmb, base, size)
diff --git a/fs/fs.c b/fs/fs.c
index 7fd22101ef..9a411c04e2 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -453,8 +453,7 @@ static int fs_read_lmb_check(const char *filename, ulong addr, loff_t offset,
 	if (len && len < read_len)
 		read_len = len;
 
-	lmb_init_and_reserve(&lmb, gd->bd->bi_dram[0].start,
-			     gd->bd->bi_dram[0].size, (void *)gd->fdt_blob);
+	lmb_init_and_reserve(&lmb, gd->bd, (void *)gd->fdt_blob);
 	lmb_dump_all(&lmb);
 
 	if (lmb_alloc_addr(&lmb, addr, read_len) == addr)
diff --git a/include/lmb.h b/include/lmb.h
index 1bb003e35e..ca235d7d9d 100644
--- a/include/lmb.h
+++ b/include/lmb.h
@@ -4,6 +4,8 @@
 #ifdef __KERNEL__
 
 #include <asm/types.h>
+#include <asm/u-boot.h>
+
 /*
  * Logical memory blocks.
  *
@@ -29,8 +31,9 @@ struct lmb {
 };
 
 extern void lmb_init(struct lmb *lmb);
-extern void lmb_init_and_reserve(struct lmb *lmb, phys_addr_t base,
-				 phys_size_t size, void *fdt_blob);
+extern void lmb_init_and_reserve(struct lmb *lmb, bd_t *bd, void *fdt_blob);
+extern void lmb_init_and_reserve_range(struct lmb *lmb, phys_addr_t base,
+				       phys_size_t size, void *fdt_blob);
 extern long lmb_add(struct lmb *lmb, phys_addr_t base, phys_size_t size);
 extern long lmb_reserve(struct lmb *lmb, phys_addr_t base, phys_size_t size);
 extern phys_addr_t lmb_alloc(struct lmb *lmb, phys_size_t size, ulong align);
diff --git a/lib/lmb.c b/lib/lmb.c
index 3407705fa7..b210c2adaa 100644
--- a/lib/lmb.c
+++ b/lib/lmb.c
@@ -98,12 +98,8 @@ void lmb_init(struct lmb *lmb)
 	lmb->reserved.size = 0;
 }
 
-/* Initialize the struct, add memory and call arch/board reserve functions */
-void lmb_init_and_reserve(struct lmb *lmb, phys_addr_t base, phys_size_t size,
-			  void *fdt_blob)
+static void lmb_reserve_common(struct lmb *lmb, void *fdt_blob)
 {
-	lmb_init(lmb);
-	lmb_add(lmb, base, size);
 	arch_lmb_reserve(lmb);
 	board_lmb_reserve(lmb);
 
@@ -111,6 +107,37 @@ void lmb_init_and_reserve(struct lmb *lmb, phys_addr_t base, phys_size_t size,
 		boot_fdt_add_mem_rsv_regions(lmb, fdt_blob);
 }
 
+/* Initialize the struct, add memory and call arch/board reserve functions */
+void lmb_init_and_reserve(struct lmb *lmb, bd_t *bd, void *fdt_blob)
+{
+#ifdef CONFIG_NR_DRAM_BANKS
+	int i;
+#endif
+
+	lmb_init(lmb);
+#ifdef CONFIG_NR_DRAM_BANKS
+	for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
+		if (bd->bi_dram[i].size) {
+			lmb_add(lmb, bd->bi_dram[i].start,
+				bd->bi_dram[i].size);
+		}
+	}
+#else
+	if (bd->bi_memsize)
+		lmb_add(lmb, bd->bi_memstart, bd->bi_memsize);
+#endif
+	lmb_reserve_common(lmb, fdt_blob);
+}
+
+/* Initialize the struct, add memory and call arch/board reserve functions */
+void lmb_init_and_reserve_range(struct lmb *lmb, phys_addr_t base,
+				phys_size_t size, void *fdt_blob)
+{
+	lmb_init(lmb);
+	lmb_add(lmb, base, size);
+	lmb_reserve_common(lmb, fdt_blob);
+}
+
 /* This routine called with relocation disabled. */
 static long lmb_add_region(struct lmb_region *rgn, phys_addr_t base, phys_size_t size)
 {
diff --git a/net/tftp.c b/net/tftp.c
index 8fab6d2650..75f3a7c141 100644
--- a/net/tftp.c
+++ b/net/tftp.c
@@ -606,8 +606,7 @@ static int tftp_init_load_addr(void)
 	struct lmb lmb;
 	phys_size_t max_size;
 
-	lmb_init_and_reserve(&lmb, gd->bd->bi_dram[0].start,
-			     gd->bd->bi_dram[0].size, (void *)gd->fdt_blob);
+	lmb_init_and_reserve(&lmb, gd->bd, (void *)gd->fdt_blob);
 
 	max_size = lmb_get_unreserved_size(&lmb, load_addr);
 	if (!max_size)
-- 
2.17.1