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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Andrei Borzenkov <arvidjaar@gmail.com>
Date: Wed, 16 May 2018 13:06:04 -0400
Subject: [PATCH] efi/uga: use 64 bit for fb_base
We get 64 bit from PCI BAR but then truncate by assigning to 32 bit.
Make sure to check that pointer does not overflow on 32 bit platform.
Closes: 50931
---
grub-core/video/efi_uga.c | 31 ++++++++++++++++---------------
1 file changed, 16 insertions(+), 15 deletions(-)
diff --git a/grub-core/video/efi_uga.c b/grub-core/video/efi_uga.c
index 464ede874da..1d4091c5631 100644
--- a/grub-core/video/efi_uga.c
+++ b/grub-core/video/efi_uga.c
@@ -34,7 +34,7 @@ GRUB_MOD_LICENSE ("GPLv3+");
static grub_efi_guid_t uga_draw_guid = GRUB_EFI_UGA_DRAW_GUID;
static struct grub_efi_uga_draw_protocol *uga;
-static grub_uint32_t uga_fb;
+static grub_uint64_t uga_fb;
static grub_uint32_t uga_pitch;
static struct
@@ -52,7 +52,7 @@ static struct
#define FBTEST_COUNT 8
static int
-find_line_len (grub_uint32_t *fb_base, grub_uint32_t *line_len)
+find_line_len (grub_uint64_t *fb_base, grub_uint32_t *line_len)
{
grub_uint32_t *base = (grub_uint32_t *) (grub_addr_t) *fb_base;
int i;
@@ -67,7 +67,7 @@ find_line_len (grub_uint32_t *fb_base, grub_uint32_t *line_len)
{
if ((base[j] & RGB_MASK) == RGB_MAGIC)
{
- *fb_base = (grub_uint32_t) (grub_addr_t) base;
+ *fb_base = (grub_uint64_t) (grub_addr_t) base;
*line_len = j << 2;
return 1;
@@ -84,7 +84,7 @@ find_line_len (grub_uint32_t *fb_base, grub_uint32_t *line_len)
/* Context for find_framebuf. */
struct find_framebuf_ctx
{
- grub_uint32_t *fb_base;
+ grub_uint64_t *fb_base;
grub_uint32_t *line_len;
int found;
};
@@ -120,7 +120,9 @@ find_card (grub_pci_device_t dev, grub_pci_id_t pciid, void *data)
if (i == 5)
break;
- old_bar2 = grub_pci_read (addr + 4);
+ i++;
+ addr += 4;
+ old_bar2 = grub_pci_read (addr);
}
else
old_bar2 = 0;
@@ -129,10 +131,15 @@ find_card (grub_pci_device_t dev, grub_pci_id_t pciid, void *data)
base64 <<= 32;
base64 |= (old_bar1 & GRUB_PCI_ADDR_MEM_MASK);
- grub_dprintf ("fb", "%s(%d): 0x%llx\n",
+ grub_dprintf ("fb", "%s(%d): 0x%" PRIxGRUB_UINT64_T "\n",
((old_bar1 & GRUB_PCI_ADDR_MEM_PREFETCH) ?
- "VMEM" : "MMIO"), i,
- (unsigned long long) base64);
+ "VMEM" : "MMIO"), type == GRUB_PCI_ADDR_MEM_TYPE_64 ? i - 1 : i,
+ base64);
+
+#if GRUB_CPU_SIZEOF_VOID_P == 4
+ if (old_bar2)
+ continue;
+#endif
if ((old_bar1 & GRUB_PCI_ADDR_MEM_PREFETCH) && (! ctx->found))
{
@@ -140,12 +147,6 @@ find_card (grub_pci_device_t dev, grub_pci_id_t pciid, void *data)
if (find_line_len (ctx->fb_base, ctx->line_len))
ctx->found++;
}
-
- if (type == GRUB_PCI_ADDR_MEM_TYPE_64)
- {
- i++;
- addr += 4;
- }
}
}
@@ -153,7 +154,7 @@ find_card (grub_pci_device_t dev, grub_pci_id_t pciid, void *data)
}
static int
-find_framebuf (grub_uint32_t *fb_base, grub_uint32_t *line_len)
+find_framebuf (grub_uint64_t *fb_base, grub_uint32_t *line_len)
{
struct find_framebuf_ctx ctx = {
.fb_base = fb_base,