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-rw-r--r--meta/recipes-devtools/qemu/qemu/CVE-2020-12829_5.patch266
1 files changed, 266 insertions, 0 deletions
diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2020-12829_5.patch b/meta/recipes-devtools/qemu/qemu/CVE-2020-12829_5.patch
new file mode 100644
index 0000000000..ab09e8b039
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/CVE-2020-12829_5.patch
@@ -0,0 +1,266 @@
+From b15a22bbcbe6a78dc3d88fe3134985e4cdd87de4 Mon Sep 17 00:00:00 2001
+From: BALATON Zoltan <balaton@eik.bme.hu>
+Date: Thu, 21 May 2020 21:39:44 +0200
+Subject: [PATCH 5/5] sm501: Replace hand written implementation with pixman
+ where possible
+
+Besides being faster this should also prevent malicious guests to
+abuse 2D engine to overwrite data or cause a crash.
+
+Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
+Message-id: 58666389b6cae256e4e972a32c05cf8aa51bffc0.1590089984.git.balaton@eik.bme.hu
+Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
+
+Upstream-Status: Backport
+CVE: CVE-2020-12829
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ hw/display/sm501.c | 207 ++++++++++++++++++++++++++-------------------
+ 1 file changed, 119 insertions(+), 88 deletions(-)
+
+diff --git a/hw/display/sm501.c b/hw/display/sm501.c
+index 5ed57703d8..8bf4d111f4 100644
+--- a/hw/display/sm501.c
++++ b/hw/display/sm501.c
+@@ -706,13 +706,12 @@ static void sm501_2d_operation(SM501State *s)
+ /* 1 if rop2 source is the pattern, otherwise the source is the bitmap */
+ int rop2_source_is_pattern = (s->twoD_control >> 14) & 0x1;
+ int rop = s->twoD_control & 0xFF;
+- int dst_x = (s->twoD_destination >> 16) & 0x01FFF;
+- int dst_y = s->twoD_destination & 0xFFFF;
+- int width = (s->twoD_dimension >> 16) & 0x1FFF;
+- int height = s->twoD_dimension & 0xFFFF;
++ unsigned int dst_x = (s->twoD_destination >> 16) & 0x01FFF;
++ unsigned int dst_y = s->twoD_destination & 0xFFFF;
++ unsigned int width = (s->twoD_dimension >> 16) & 0x1FFF;
++ unsigned int height = s->twoD_dimension & 0xFFFF;
+ uint32_t dst_base = s->twoD_destination_base & 0x03FFFFFF;
+- uint8_t *dst = s->local_mem + dst_base;
+- int dst_pitch = (s->twoD_pitch >> 16) & 0x1FFF;
++ unsigned int dst_pitch = (s->twoD_pitch >> 16) & 0x1FFF;
+ int crt = (s->dc_crt_control & SM501_DC_CRT_CONTROL_SEL) ? 1 : 0;
+ int fb_len = get_width(s, crt) * get_height(s, crt) * get_bpp(s, crt);
+
+@@ -721,104 +720,136 @@ static void sm501_2d_operation(SM501State *s)
+ return;
+ }
+
+- if (rop_mode == 0) {
+- if (rop != 0xcc) {
+- /* Anything other than plain copies are not supported */
+- qemu_log_mask(LOG_UNIMP, "sm501: rop3 mode with rop %x is not "
+- "supported.\n", rop);
+- }
+- } else {
+- if (rop2_source_is_pattern && rop != 0x5) {
+- /* For pattern source, we support only inverse dest */
+- qemu_log_mask(LOG_UNIMP, "sm501: rop2 source being the pattern and "
+- "rop %x is not supported.\n", rop);
+- } else {
+- if (rop != 0x5 && rop != 0xc) {
+- /* Anything other than plain copies or inverse dest is not
+- * supported */
+- qemu_log_mask(LOG_UNIMP, "sm501: rop mode %x is not "
+- "supported.\n", rop);
+- }
+- }
+- }
+-
+ if (s->twoD_source_base & BIT(27) || s->twoD_destination_base & BIT(27)) {
+ qemu_log_mask(LOG_UNIMP, "sm501: only local memory is supported.\n");
+ return;
+ }
+
++ if (!dst_pitch) {
++ qemu_log_mask(LOG_GUEST_ERROR, "sm501: Zero dest pitch.\n");
++ return;
++ }
++
++ if (!width || !height) {
++ qemu_log_mask(LOG_GUEST_ERROR, "sm501: Zero size 2D op.\n");
++ return;
++ }
++
++ if (rtl) {
++ dst_x -= width - 1;
++ dst_y -= height - 1;
++ }
++
++ if (dst_base >= get_local_mem_size(s) || dst_base +
++ (dst_x + width + (dst_y + height) * (dst_pitch + width)) *
++ (1 << format) >= get_local_mem_size(s)) {
++ qemu_log_mask(LOG_GUEST_ERROR, "sm501: 2D op dest is outside vram.\n");
++ return;
++ }
++
+ switch (cmd) {
+- case 0x00: /* copy area */
++ case 0: /* BitBlt */
+ {
+- int src_x = (s->twoD_source >> 16) & 0x01FFF;
+- int src_y = s->twoD_source & 0xFFFF;
++ unsigned int src_x = (s->twoD_source >> 16) & 0x01FFF;
++ unsigned int src_y = s->twoD_source & 0xFFFF;
+ uint32_t src_base = s->twoD_source_base & 0x03FFFFFF;
+- uint8_t *src = s->local_mem + src_base;
+- int src_pitch = s->twoD_pitch & 0x1FFF;
+-
+-#define COPY_AREA(_bpp, _pixel_type, rtl) { \
+- int y, x, index_d, index_s; \
+- for (y = 0; y < height; y++) { \
+- for (x = 0; x < width; x++) { \
+- _pixel_type val; \
+- \
+- if (rtl) { \
+- index_s = ((src_y - y) * src_pitch + src_x - x) * _bpp; \
+- index_d = ((dst_y - y) * dst_pitch + dst_x - x) * _bpp; \
+- } else { \
+- index_s = ((src_y + y) * src_pitch + src_x + x) * _bpp; \
+- index_d = ((dst_y + y) * dst_pitch + dst_x + x) * _bpp; \
+- } \
+- if (rop_mode == 1 && rop == 5) { \
+- /* Invert dest */ \
+- val = ~*(_pixel_type *)&dst[index_d]; \
+- } else { \
+- val = *(_pixel_type *)&src[index_s]; \
+- } \
+- *(_pixel_type *)&dst[index_d] = val; \
+- } \
+- } \
+- }
+- switch (format) {
+- case 0:
+- COPY_AREA(1, uint8_t, rtl);
+- break;
+- case 1:
+- COPY_AREA(2, uint16_t, rtl);
+- break;
+- case 2:
+- COPY_AREA(4, uint32_t, rtl);
+- break;
++ unsigned int src_pitch = s->twoD_pitch & 0x1FFF;
++
++ if (!src_pitch) {
++ qemu_log_mask(LOG_GUEST_ERROR, "sm501: Zero src pitch.\n");
++ return;
++ }
++
++ if (rtl) {
++ src_x -= width - 1;
++ src_y -= height - 1;
++ }
++
++ if (src_base >= get_local_mem_size(s) || src_base +
++ (src_x + width + (src_y + height) * (src_pitch + width)) *
++ (1 << format) >= get_local_mem_size(s)) {
++ qemu_log_mask(LOG_GUEST_ERROR,
++ "sm501: 2D op src is outside vram.\n");
++ return;
++ }
++
++ if ((rop_mode && rop == 0x5) || (!rop_mode && rop == 0x55)) {
++ /* Invert dest, is there a way to do this with pixman? */
++ unsigned int x, y, i;
++ uint8_t *d = s->local_mem + dst_base;
++
++ for (y = 0; y < height; y++) {
++ i = (dst_x + (dst_y + y) * dst_pitch) * (1 << format);
++ for (x = 0; x < width; x++, i += (1 << format)) {
++ switch (format) {
++ case 0:
++ d[i] = ~d[i];
++ break;
++ case 1:
++ *(uint16_t *)&d[i] = ~*(uint16_t *)&d[i];
++ break;
++ case 2:
++ *(uint32_t *)&d[i] = ~*(uint32_t *)&d[i];
++ break;
++ }
++ }
++ }
++ } else {
++ /* Do copy src for unimplemented ops, better than unpainted area */
++ if ((rop_mode && (rop != 0xc || rop2_source_is_pattern)) ||
++ (!rop_mode && rop != 0xcc)) {
++ qemu_log_mask(LOG_UNIMP,
++ "sm501: rop%d op %x%s not implemented\n",
++ (rop_mode ? 2 : 3), rop,
++ (rop2_source_is_pattern ?
++ " with pattern source" : ""));
++ }
++ /* Check for overlaps, this could be made more exact */
++ uint32_t sb, se, db, de;
++ sb = src_base + src_x + src_y * (width + src_pitch);
++ se = sb + width + height * (width + src_pitch);
++ db = dst_base + dst_x + dst_y * (width + dst_pitch);
++ de = db + width + height * (width + dst_pitch);
++ if (rtl && ((db >= sb && db <= se) || (de >= sb && de <= se))) {
++ /* regions may overlap: copy via temporary */
++ int llb = width * (1 << format);
++ int tmp_stride = DIV_ROUND_UP(llb, sizeof(uint32_t));
++ uint32_t *tmp = g_malloc(tmp_stride * sizeof(uint32_t) *
++ height);
++ pixman_blt((uint32_t *)&s->local_mem[src_base], tmp,
++ src_pitch * (1 << format) / sizeof(uint32_t),
++ tmp_stride, 8 * (1 << format), 8 * (1 << format),
++ src_x, src_y, 0, 0, width, height);
++ pixman_blt(tmp, (uint32_t *)&s->local_mem[dst_base],
++ tmp_stride,
++ dst_pitch * (1 << format) / sizeof(uint32_t),
++ 8 * (1 << format), 8 * (1 << format),
++ 0, 0, dst_x, dst_y, width, height);
++ g_free(tmp);
++ } else {
++ pixman_blt((uint32_t *)&s->local_mem[src_base],
++ (uint32_t *)&s->local_mem[dst_base],
++ src_pitch * (1 << format) / sizeof(uint32_t),
++ dst_pitch * (1 << format) / sizeof(uint32_t),
++ 8 * (1 << format), 8 * (1 << format),
++ src_x, src_y, dst_x, dst_y, width, height);
++ }
+ }
+ break;
+ }
+- case 0x01: /* fill rectangle */
++ case 1: /* Rectangle Fill */
+ {
+ uint32_t color = s->twoD_foreground;
+
+-#define FILL_RECT(_bpp, _pixel_type) { \
+- int y, x; \
+- for (y = 0; y < height; y++) { \
+- for (x = 0; x < width; x++) { \
+- int index = ((dst_y + y) * dst_pitch + dst_x + x) * _bpp; \
+- *(_pixel_type *)&dst[index] = (_pixel_type)color; \
+- } \
+- } \
+- }
+-
+- switch (format) {
+- case 0:
+- FILL_RECT(1, uint8_t);
+- break;
+- case 1:
+- color = cpu_to_le16(color);
+- FILL_RECT(2, uint16_t);
+- break;
+- case 2:
++ if (format == 2) {
+ color = cpu_to_le32(color);
+- FILL_RECT(4, uint32_t);
+- break;
++ } else if (format == 1) {
++ color = cpu_to_le16(color);
+ }
++
++ pixman_fill((uint32_t *)&s->local_mem[dst_base],
++ dst_pitch * (1 << format) / sizeof(uint32_t),
++ 8 * (1 << format), dst_x, dst_y, width, height, color);
+ break;
+ }
+ default:
+--
+2.25.1
+
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