This patch adds a fix for multiple integer overflows in grub's video/fb/video_fb. It is a part of a security series [1].
[1] https://lists.gnu.org/archive/html/grub-devel/2021-03/msg00007.html Signed-off-by: Marta Rybczynska <marta.rybczyn...@huawei.com> --- ...eo_fb-Fix-multiple-integer-overflows.patch | 104 ++++++++++++++++++ meta/recipes-bsp/grub/grub2.inc | 1 + 2 files changed, 105 insertions(+) create mode 100644 meta/recipes-bsp/grub/files/0033-video-fb-video_fb-Fix-multiple-integer-overflows.patch diff --git a/meta/recipes-bsp/grub/files/0033-video-fb-video_fb-Fix-multiple-integer-overflows.patch b/meta/recipes-bsp/grub/files/0033-video-fb-video_fb-Fix-multiple-integer-overflows.patch new file mode 100644 index 0000000000..544e7f31ae --- /dev/null +++ b/meta/recipes-bsp/grub/files/0033-video-fb-video_fb-Fix-multiple-integer-overflows.patch @@ -0,0 +1,104 @@ +From 69b91f7466a5ad5fb85039a5b4118efb77ad6347 Mon Sep 17 00:00:00 2001 +From: Darren Kenny <darren.ke...@oracle.com> +Date: Wed, 4 Nov 2020 14:43:44 +0000 +Subject: [PATCH] video/fb/video_fb: Fix multiple integer overflows + +The calculation of the unsigned 64-bit value is being generated by +multiplying 2, signed or unsigned, 32-bit integers which may overflow +before promotion to unsigned 64-bit. Fix all of them. + +Fixes: CID 73703, CID 73767, CID 73833 + +Signed-off-by: Darren Kenny <darren.ke...@oracle.com> +Reviewed-by: Daniel Kiper <daniel.ki...@oracle.com> + +Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/grub.git/commit/?id=08e098b1dbf01e96376f594b337491bc4cfa48dd] +Signed-off-by: Marta Rybczynska <marta.rybczyn...@huawei.com> +--- + grub-core/video/fb/video_fb.c | 52 ++++++++++++++++++++++++----------- + 1 file changed, 36 insertions(+), 16 deletions(-) + +diff --git a/grub-core/video/fb/video_fb.c b/grub-core/video/fb/video_fb.c +index 1a602c8..1c9a138 100644 +--- a/grub-core/video/fb/video_fb.c ++++ b/grub-core/video/fb/video_fb.c +@@ -25,6 +25,7 @@ + #include <grub/fbutil.h> + #include <grub/bitmap.h> + #include <grub/dl.h> ++#include <grub/safemath.h> + + GRUB_MOD_LICENSE ("GPLv3+"); + +@@ -1417,15 +1418,23 @@ doublebuf_blit_update_screen (void) + { + if (framebuffer.current_dirty.first_line + <= framebuffer.current_dirty.last_line) +- grub_memcpy ((char *) framebuffer.pages[0] +- + framebuffer.current_dirty.first_line +- * framebuffer.back_target->mode_info.pitch, +- (char *) framebuffer.back_target->data +- + framebuffer.current_dirty.first_line +- * framebuffer.back_target->mode_info.pitch, +- framebuffer.back_target->mode_info.pitch +- * (framebuffer.current_dirty.last_line +- - framebuffer.current_dirty.first_line)); ++ { ++ grub_size_t copy_size; ++ ++ if (grub_sub (framebuffer.current_dirty.last_line, ++ framebuffer.current_dirty.first_line, ©_size) || ++ grub_mul (framebuffer.back_target->mode_info.pitch, copy_size, ©_size)) ++ { ++ /* Shouldn't happen, but if it does we've a bug. */ ++ return GRUB_ERR_BUG; ++ } ++ ++ grub_memcpy ((char *) framebuffer.pages[0] + framebuffer.current_dirty.first_line * ++ framebuffer.back_target->mode_info.pitch, ++ (char *) framebuffer.back_target->data + framebuffer.current_dirty.first_line * ++ framebuffer.back_target->mode_info.pitch, ++ copy_size); ++ } + framebuffer.current_dirty.first_line + = framebuffer.back_target->mode_info.height; + framebuffer.current_dirty.last_line = 0; +@@ -1439,7 +1448,7 @@ grub_video_fb_doublebuf_blit_init (struct grub_video_fbrender_target **back, + volatile void *framebuf) + { + grub_err_t err; +- grub_size_t page_size = mode_info.pitch * mode_info.height; ++ grub_size_t page_size = (grub_size_t) mode_info.pitch * mode_info.height; + + framebuffer.offscreen_buffer = grub_zalloc (page_size); + if (! framebuffer.offscreen_buffer) +@@ -1482,12 +1491,23 @@ doublebuf_pageflipping_update_screen (void) + last_line = framebuffer.previous_dirty.last_line; + + if (first_line <= last_line) +- grub_memcpy ((char *) framebuffer.pages[framebuffer.render_page] +- + first_line * framebuffer.back_target->mode_info.pitch, +- (char *) framebuffer.back_target->data +- + first_line * framebuffer.back_target->mode_info.pitch, +- framebuffer.back_target->mode_info.pitch +- * (last_line - first_line)); ++ { ++ grub_size_t copy_size; ++ ++ if (grub_sub (last_line, first_line, ©_size) || ++ grub_mul (framebuffer.back_target->mode_info.pitch, copy_size, ©_size)) ++ { ++ /* Shouldn't happen, but if it does we've a bug. */ ++ return GRUB_ERR_BUG; ++ } ++ ++ grub_memcpy ((char *) framebuffer.pages[framebuffer.render_page] + first_line * ++ framebuffer.back_target->mode_info.pitch, ++ (char *) framebuffer.back_target->data + first_line * ++ framebuffer.back_target->mode_info.pitch, ++ copy_size); ++ } ++ + framebuffer.previous_dirty = framebuffer.current_dirty; + framebuffer.current_dirty.first_line + = framebuffer.back_target->mode_info.height; diff --git a/meta/recipes-bsp/grub/grub2.inc b/meta/recipes-bsp/grub/grub2.inc index 710ab5e361..8b5b9e3b3e 100644 --- a/meta/recipes-bsp/grub/grub2.inc +++ b/meta/recipes-bsp/grub/grub2.inc @@ -79,6 +79,7 @@ SRC_URI = "${GNU_MIRROR}/grub/grub-${PV}.tar.gz \ file://0030-commands-hashsum-Fix-a-memory-leak.patch \ file://0031-video-efi_gop-Remove-unnecessary-return-value-of-gru.patch \ file://0032-video-fb-fbfill-Fix-potential-integer-overflow.patch \ + file://0033-video-fb-video_fb-Fix-multiple-integer-overflows.patch \ " SRC_URI[md5sum] = "5ce674ca6b2612d8939b9e6abed32934" SRC_URI[sha256sum] = "f10c85ae3e204dbaec39ae22fa3c5e99f0665417e91c2cb49b7e5031658ba6ea" -- 2.33.0
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