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https://src.fedoraproject.org/rpms/grub2.git
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67 lines
2.7 KiB
Diff
67 lines
2.7 KiB
Diff
From: Valdimir Serbinenko <phcoder@gmail.com>
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Subject: Reject huge flat panels and monitors over 4096x4096
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https://bugzilla.redhat.com/show_bug.cgi?id=827003
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Backport upstream rev 4412
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diff --git a/grub-core/video/efi_gop.c b/grub-core/video/efi_gop.c
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index 3e1cc23..4628dd0 100644
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--- a/grub-core/video/efi_gop.c
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+++ b/grub-core/video/efi_gop.c
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@@ -368,7 +368,7 @@ grub_video_gop_setup (unsigned int width, unsigned int height,
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{
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err = 1;
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grub_gop_get_preferred_mode (&preferred_width, &preferred_height);
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- if (err)
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+ if (err || width >= 4096 || height >= 4096)
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{
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preferred_width = 800;
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preferred_height = 600;
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diff --git a/grub-core/video/i386/pc/vbe.c b/grub-core/video/i386/pc/vbe.c
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index 5656388..62e530a 100644
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--- a/grub-core/video/i386/pc/vbe.c
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+++ b/grub-core/video/i386/pc/vbe.c
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@@ -581,7 +581,6 @@ grub_vbe_get_preferred_mode (unsigned int *width, unsigned int *height)
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/* Use low memory scratch area as temporary storage for VESA BIOS calls. */
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flat_panel_info = (struct grub_vbe_flat_panel_info *)
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(GRUB_MEMORY_MACHINE_SCRATCH_ADDR + sizeof (struct grub_video_edid_info));
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- grub_memset (flat_panel_info, 0, sizeof (*flat_panel_info));
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if (controller_info.version >= 0x200
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&& (grub_vbe_bios_get_ddc_capabilities (&ddc_level) & 0xff)
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@@ -590,14 +589,18 @@ grub_vbe_get_preferred_mode (unsigned int *width, unsigned int *height)
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if (grub_video_vbe_get_edid (&edid_info) == GRUB_ERR_NONE
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&& grub_video_edid_checksum (&edid_info) == GRUB_ERR_NONE
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&& grub_video_edid_preferred_mode (&edid_info, width, height)
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- == GRUB_ERR_NONE)
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+ == GRUB_ERR_NONE && *width < 4096 && *height < 4096)
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return GRUB_ERR_NONE;
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grub_errno = GRUB_ERR_NONE;
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}
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+ grub_memset (flat_panel_info, 0, sizeof (*flat_panel_info));
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status = grub_vbe_bios_get_flat_panel_info (flat_panel_info);
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- if (status == GRUB_VBE_STATUS_OK)
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+ if (status == GRUB_VBE_STATUS_OK
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+ && flat_panel_info->horizontal_size && flat_panel_info->vertical_size
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+ && flat_panel_info->horizontal_size < 4096
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+ && flat_panel_info->vertical_size < 4096)
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{
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*width = flat_panel_info->horizontal_size;
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*height = flat_panel_info->vertical_size;
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diff --git a/grub-core/video/video.c b/grub-core/video/video.c
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index 67de85a..c36994f 100644
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--- a/grub-core/video/video.c
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+++ b/grub-core/video/video.c
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@@ -415,7 +415,8 @@ grub_video_edid_preferred_mode (struct grub_video_edid_info *edid_info,
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| (((unsigned int)
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(edid_info->detailed_timings[0].vertical_hi & 0xf0))
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<< 4);
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- return GRUB_ERR_NONE;
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+ if (*width && *height)
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+ return GRUB_ERR_NONE;
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}
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return grub_error (GRUB_ERR_BAD_DEVICE, "no preferred mode available");
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