diff options
Diffstat (limited to 'meta/recipes-devtools/qemu/qemu/CVE-2020-12829_5.patch')
-rw-r--r-- | meta/recipes-devtools/qemu/qemu/CVE-2020-12829_5.patch | 266 |
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 + |