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qemu.19783
sm501-Replace-hand-written-implementatio.patch
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File sm501-Replace-hand-written-implementatio.patch of Package qemu.19783
From: BALATON Zoltan <balaton@eik.bme.hu> Date: Thu, 21 May 2020 21:39:44 +0200 Subject: sm501: Replace hand written implementation with pixman where possible Git-commit: b15a22bbcbe6a78dc3d88fe3134985e4cdd87de4 References: bsc#1172385, CVE-2020-12829 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> Signed-off-by: Bruce Rogers <brogers@suse.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 4204b80f988815200120852d64ec..745d25c2fb248baf3f01970bbb61 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:
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