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