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SUSE:SLE-12-SP3:GA
xen.4698
CVE-2017-7980-qemuu-cirrus-stop-passing-around-...
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File CVE-2017-7980-qemuu-cirrus-stop-passing-around-dst-pointers-in-the-blitter.patch of Package xen.4698
References: bsc#1035483 CVE-2017-7980 Subject: cirrus: stop passing around dst pointers in the blitter From: Gerd Hoffmann kraxel@redhat.com Wed Mar 15 11:47:52 2017 +0100 Date: Thu Mar 16 08:58:15 2017 +0100: Git: 026aeffcb4752054830ba203020ed6eb05bcaba8 Instead pass around the address (aka offset into vga memory). Calculate the pointer in the rop_* functions, after applying the mask to the address, to make sure the address stays within the valid range. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Message-id: 1489574872-8679-1-git-send-email-kraxel@redhat.com Index: xen-4.4.4-testing/tools/qemu-xen-dir-remote/hw/display/cirrus_vga.c =================================================================== --- xen-4.4.4-testing.orig/tools/qemu-xen-dir-remote/hw/display/cirrus_vga.c +++ xen-4.4.4-testing/tools/qemu-xen-dir-remote/hw/display/cirrus_vga.c @@ -174,11 +174,12 @@ struct CirrusVGAState; typedef void (*cirrus_bitblt_rop_t) (struct CirrusVGAState *s, - uint8_t * dst, const uint8_t * src, + uint32_t dstaddr, const uint8_t *src, int dstpitch, int srcpitch, int bltwidth, int bltheight); typedef void (*cirrus_fill_t)(struct CirrusVGAState *s, - uint8_t *dst, int dst_pitch, int width, int height); + uint32_t dstaddr, int dst_pitch, + int width, int height); typedef struct CirrusVGAState { VGACommonState vga; @@ -308,14 +309,14 @@ static bool blit_is_unsafe(struct Cirrus } static void cirrus_bitblt_rop_nop(CirrusVGAState *s, - uint8_t *dst,const uint8_t *src, + uint32_t dstaddr, const uint8_t *src, int dstpitch,int srcpitch, int bltwidth,int bltheight) { } static void cirrus_bitblt_fill_nop(CirrusVGAState *s, - uint8_t *dst, + uint32_t dstaddr, int dstpitch, int bltwidth,int bltheight) { } @@ -660,14 +661,10 @@ static void cirrus_invalidate_region(Cir static int cirrus_bitblt_common_patterncopy(CirrusVGAState * s, const uint8_t * src) { - uint8_t *dst; - - dst = s->vga.vram_ptr + (s->cirrus_blt_dstaddr & s->cirrus_addr_mask); - if (blit_is_unsafe(s)) return 0; - (*s->cirrus_rop) (s, dst, src, + (*s->cirrus_rop) (s, s->cirrus_blt_dstaddr, src, s->cirrus_blt_dstpitch, 0, s->cirrus_blt_width, s->cirrus_blt_height); cirrus_invalidate_region(s, s->cirrus_blt_dstaddr, @@ -686,7 +683,7 @@ static int cirrus_bitblt_solidfill(Cirru return 0; } rop_func = cirrus_fill[rop_to_index[blt_rop]][s->cirrus_blt_pixelwidth - 1]; - rop_func(s, s->vga.vram_ptr + (s->cirrus_blt_dstaddr & s->cirrus_addr_mask), + rop_func(s, (s->cirrus_blt_dstaddr & s->cirrus_addr_mask), s->cirrus_blt_dstpitch, s->cirrus_blt_width, s->cirrus_blt_height); cirrus_invalidate_region(s, s->cirrus_blt_dstaddr, @@ -755,8 +752,7 @@ static int cirrus_do_copy(CirrusVGAState } } - (*s->cirrus_rop) (s, s->vga.vram_ptr + - (s->cirrus_blt_dstaddr & s->cirrus_addr_mask), + (*s->cirrus_rop) (s, (s->cirrus_blt_dstaddr & s->cirrus_addr_mask), s->vga.vram_ptr + (s->cirrus_blt_srcaddr & s->cirrus_addr_mask), s->cirrus_blt_dstpitch, s->cirrus_blt_srcpitch, @@ -808,8 +804,7 @@ static void cirrus_bitblt_cputovideo_nex } else { /* at least one scan line */ do { - (*s->cirrus_rop)(s, s->vga.vram_ptr + - (s->cirrus_blt_dstaddr & s->cirrus_addr_mask), + (*s->cirrus_rop)(s, (s->cirrus_blt_dstaddr & s->cirrus_addr_mask), s->cirrus_bltbuf, 0, 0, s->cirrus_blt_width, 1); cirrus_invalidate_region(s, s->cirrus_blt_dstaddr, 0, s->cirrus_blt_width, 1); Index: xen-4.4.4-testing/tools/qemu-xen-dir-remote/hw/display/cirrus_vga_rop.h =================================================================== --- xen-4.4.4-testing.orig/tools/qemu-xen-dir-remote/hw/display/cirrus_vga_rop.h +++ xen-4.4.4-testing/tools/qemu-xen-dir-remote/hw/display/cirrus_vga_rop.h @@ -22,31 +22,65 @@ * THE SOFTWARE. */ -static inline void glue(rop_8_,ROP_NAME)(uint8_t *dst, uint8_t src) +static inline void glue(rop_8_, ROP_NAME)(CirrusVGAState *s, + uint32_t dstaddr, uint8_t src) { + uint8_t *dst = &s->vga.vram_ptr[dstaddr & s->cirrus_addr_mask]; *dst = ROP_FN(*dst, src); } -static inline void glue(rop_16_,ROP_NAME)(uint16_t *dst, uint16_t src) +static inline void glue(rop_tr_8_, ROP_NAME)(CirrusVGAState *s, + uint32_t dstaddr, uint8_t src, + uint8_t transp) { + uint8_t *dst = &s->vga.vram_ptr[dstaddr & s->cirrus_addr_mask]; + uint8_t pixel = ROP_FN(*dst, src); + if (pixel != transp) { + *dst = pixel; + } +} + +static inline void glue(rop_16_, ROP_NAME)(CirrusVGAState *s, + uint32_t dstaddr, uint16_t src) +{ + uint16_t *dst = (uint16_t *) + (&s->vga.vram_ptr[dstaddr & s->cirrus_addr_mask & ~1]); *dst = ROP_FN(*dst, src); } -static inline void glue(rop_32_,ROP_NAME)(uint32_t *dst, uint32_t src) +static inline void glue(rop_tr_16_, ROP_NAME)(CirrusVGAState *s, + uint32_t dstaddr, uint16_t src, + uint16_t transp) +{ + uint16_t *dst = (uint16_t *) + (&s->vga.vram_ptr[dstaddr & s->cirrus_addr_mask & ~1]); + uint16_t pixel = ROP_FN(*dst, src); + if (pixel != transp) { + *dst = pixel; + } +} + +static inline void glue(rop_32_, ROP_NAME)(CirrusVGAState *s, + uint32_t dstaddr, uint32_t src) { + uint32_t *dst = (uint32_t *) + (&s->vga.vram_ptr[dstaddr & s->cirrus_addr_mask & ~3]); *dst = ROP_FN(*dst, src); } -#define ROP_OP(d, s) glue(rop_8_,ROP_NAME)(d, s) -#define ROP_OP_16(d, s) glue(rop_16_,ROP_NAME)(d, s) -#define ROP_OP_32(d, s) glue(rop_32_,ROP_NAME)(d, s) +#define ROP_OP(st, d, s) glue(rop_8_, ROP_NAME)(st, d, s) +#define ROP_OP_TR(st, d, s, t) glue(rop_tr_8_, ROP_NAME)(st, d, s, t) +#define ROP_OP_16(st, d, s) glue(rop_16_, ROP_NAME)(st, d, s) +#define ROP_OP_TR_16(st, d, s, t) glue(rop_tr_16_, ROP_NAME)(st, d, s, t) +#define ROP_OP_32(st, d, s) glue(rop_32_, ROP_NAME)(st, d, s) #undef ROP_FN static void glue(cirrus_bitblt_rop_fwd_, ROP_NAME)(CirrusVGAState *s, - uint8_t *dst,const uint8_t *src, - int dstpitch,int srcpitch, - int bltwidth,int bltheight) + uint32_t dstaddr, + const uint8_t *src, + int dstpitch, int srcpitch, + int bltwidth, int bltheight) { int x,y; dstpitch -= bltwidth; @@ -59,43 +93,47 @@ glue(cirrus_bitblt_rop_fwd_, ROP_NAME)(C for (y = 0; y < bltheight; y++) { for (x = 0; x < bltwidth; x++) { - ROP_OP(dst, *src); - dst++; + ROP_OP(s, dstaddr, *src); + dstaddr++; src++; } - dst += dstpitch; + dstaddr += dstpitch; src += srcpitch; } } static void glue(cirrus_bitblt_rop_bkwd_, ROP_NAME)(CirrusVGAState *s, - uint8_t *dst,const uint8_t *src, - int dstpitch,int srcpitch, - int bltwidth,int bltheight) + uint32_t dstaddr, + const uint8_t *src, + int dstpitch, int srcpitch, + int bltwidth, int bltheight) { int x,y; dstpitch += bltwidth; srcpitch += bltwidth; for (y = 0; y < bltheight; y++) { for (x = 0; x < bltwidth; x++) { - ROP_OP(dst, *src); - dst--; + ROP_OP(s, dstaddr, *src); + dstaddr--; src--; } - dst += dstpitch; + dstaddr += dstpitch; src += srcpitch; } } static void glue(glue(cirrus_bitblt_rop_fwd_transp_, ROP_NAME),_8)(CirrusVGAState *s, - uint8_t *dst,const uint8_t *src, - int dstpitch,int srcpitch, - int bltwidth,int bltheight) + uint32_t dstaddr, + const uint8_t *src, + int dstpitch, + int srcpitch, + int bltwidth, + int bltheight) { int x,y; - uint8_t p; + uint8_t transp = s->vga.gr[0x34]; dstpitch -= bltwidth; srcpitch -= bltwidth; @@ -105,48 +143,50 @@ glue(glue(cirrus_bitblt_rop_fwd_transp_, for (y = 0; y < bltheight; y++) { for (x = 0; x < bltwidth; x++) { - p = *dst; - ROP_OP(&p, *src); - if (p != s->vga.gr[0x34]) *dst = p; - dst++; + ROP_OP_TR(s, dstaddr, *src, transp); + dstaddr++; src++; } - dst += dstpitch; + dstaddr += dstpitch; src += srcpitch; } } static void glue(glue(cirrus_bitblt_rop_bkwd_transp_, ROP_NAME),_8)(CirrusVGAState *s, - uint8_t *dst,const uint8_t *src, - int dstpitch,int srcpitch, - int bltwidth,int bltheight) + uint32_t dstaddr, + const uint8_t *src, + int dstpitch, + int srcpitch, + int bltwidth, + int bltheight) { int x,y; - uint8_t p; + uint8_t transp = s->vga.gr[0x34]; dstpitch += bltwidth; srcpitch += bltwidth; for (y = 0; y < bltheight; y++) { for (x = 0; x < bltwidth; x++) { - p = *dst; - ROP_OP(&p, *src); - if (p != s->vga.gr[0x34]) *dst = p; - dst--; + ROP_OP_TR(s, dstaddr, *src, transp); + dstaddr--; src--; } - dst += dstpitch; + dstaddr += dstpitch; src += srcpitch; } } static void glue(glue(cirrus_bitblt_rop_fwd_transp_, ROP_NAME),_16)(CirrusVGAState *s, - uint8_t *dst,const uint8_t *src, - int dstpitch,int srcpitch, - int bltwidth,int bltheight) + uint32_t dstaddr, + const uint8_t *src, + int dstpitch, + int srcpitch, + int bltwidth, + int bltheight) { int x,y; - uint8_t p1, p2; + uint16_t transp = s->vga.gr[0x34] | (uint16_t)s->vga.gr[0x35] << 8; dstpitch -= bltwidth; srcpitch -= bltwidth; @@ -156,46 +196,35 @@ glue(glue(cirrus_bitblt_rop_fwd_transp_, for (y = 0; y < bltheight; y++) { for (x = 0; x < bltwidth; x+=2) { - p1 = *dst; - p2 = *(dst+1); - ROP_OP(&p1, *src); - ROP_OP(&p2, *(src + 1)); - if ((p1 != s->vga.gr[0x34]) || (p2 != s->vga.gr[0x35])) { - *dst = p1; - *(dst+1) = p2; - } - dst+=2; - src+=2; + ROP_OP_TR_16(s, dstaddr, *(uint16_t *)src, transp); + dstaddr += 2; + src += 2; } - dst += dstpitch; + dstaddr += dstpitch; src += srcpitch; } } static void glue(glue(cirrus_bitblt_rop_bkwd_transp_, ROP_NAME),_16)(CirrusVGAState *s, - uint8_t *dst,const uint8_t *src, - int dstpitch,int srcpitch, - int bltwidth,int bltheight) + uint32_t dstaddr, + const uint8_t *src, + int dstpitch, + int srcpitch, + int bltwidth, + int bltheight) { int x,y; - uint8_t p1, p2; + uint16_t transp = s->vga.gr[0x34] | (uint16_t)s->vga.gr[0x35] << 8; dstpitch += bltwidth; srcpitch += bltwidth; for (y = 0; y < bltheight; y++) { for (x = 0; x < bltwidth; x+=2) { - p1 = *(dst-1); - p2 = *dst; - ROP_OP(&p1, *(src - 1)); - ROP_OP(&p2, *src); - if ((p1 != s->vga.gr[0x34]) || (p2 != s->vga.gr[0x35])) { - *(dst-1) = p1; - *dst = p2; - } - dst-=2; - src-=2; + ROP_OP_TR_16(s, dstaddr, *(uint16_t *)src, transp); + dstaddr -= 2; + src -= 2; } - dst += dstpitch; + dstaddr += dstpitch; src += srcpitch; } } Index: xen-4.4.4-testing/tools/qemu-xen-dir-remote/hw/display/cirrus_vga_rop2.h =================================================================== --- xen-4.4.4-testing.orig/tools/qemu-xen-dir-remote/hw/display/cirrus_vga_rop2.h +++ xen-4.4.4-testing/tools/qemu-xen-dir-remote/hw/display/cirrus_vga_rop2.h @@ -23,27 +23,29 @@ */ #if DEPTH == 8 -#define PUTPIXEL() ROP_OP(&d[0], col) +#define PUTPIXEL(s, a, c) ROP_OP(s, a, c) #elif DEPTH == 16 -#define PUTPIXEL() ROP_OP_16((uint16_t *)&d[0], col) +#define PUTPIXEL(s, a, c) ROP_OP_16(s, a, c) #elif DEPTH == 24 -#define PUTPIXEL() ROP_OP(&d[0], col); \ - ROP_OP(&d[1], (col >> 8)); \ - ROP_OP(&d[2], (col >> 16)) +#define PUTPIXEL(s, a, c) do { \ + ROP_OP(s, a, c); \ + ROP_OP(s, a + 1, (col >> 8)); \ + ROP_OP(s, a + 2, (col >> 16)); \ + } while (0) #elif DEPTH == 32 -#define PUTPIXEL() ROP_OP_32(((uint32_t *)&d[0]), col) +#define PUTPIXEL(s, a, c) ROP_OP_32(s, a, c) #else #error unsupported DEPTH #endif static void glue(glue(glue(cirrus_patternfill_, ROP_NAME), _),DEPTH) - (CirrusVGAState * s, uint8_t * dst, - const uint8_t * src, + (CirrusVGAState *s, uint32_t dstaddr, + const uint8_t *src, int dstpitch, int srcpitch, int bltwidth, int bltheight) { - uint8_t *d; + uint32_t addr; int x, y, pattern_y, pattern_pitch, pattern_x; unsigned int col; const uint8_t *src1; @@ -63,7 +65,7 @@ glue(glue(glue(cirrus_patternfill_, ROP_ pattern_y = s->cirrus_blt_srcaddr & 7; for(y = 0; y < bltheight; y++) { pattern_x = skipleft; - d = dst + skipleft; + addr = dstaddr + skipleft; src1 = src + pattern_y * pattern_pitch; for (x = skipleft; x < bltwidth; x += (DEPTH / 8)) { #if DEPTH == 8 @@ -82,23 +84,23 @@ glue(glue(glue(cirrus_patternfill_, ROP_ col = ((uint32_t *)(src1 + pattern_x))[0]; pattern_x = (pattern_x + 4) & 31; #endif - PUTPIXEL(); - d += (DEPTH / 8); + PUTPIXEL(s, addr, col); + addr += (DEPTH / 8); } pattern_y = (pattern_y + 1) & 7; - dst += dstpitch; + dstaddr += dstpitch; } } /* NOTE: srcpitch is ignored */ static void glue(glue(glue(cirrus_colorexpand_transp_, ROP_NAME), _),DEPTH) - (CirrusVGAState * s, uint8_t * dst, - const uint8_t * src, + (CirrusVGAState *s, uint32_t dstaddr, + const uint8_t *src, int dstpitch, int srcpitch, int bltwidth, int bltheight) { - uint8_t *d; + uint32_t addr; int x, y; unsigned bits, bits_xor; unsigned int col; @@ -123,7 +125,7 @@ glue(glue(glue(cirrus_colorexpand_transp for(y = 0; y < bltheight; y++) { bitmask = 0x80 >> srcskipleft; bits = *src++ ^ bits_xor; - d = dst + dstskipleft; + addr = dstaddr + dstskipleft; for (x = dstskipleft; x < bltwidth; x += (DEPTH / 8)) { if ((bitmask & 0xff) == 0) { bitmask = 0x80; @@ -131,24 +133,24 @@ glue(glue(glue(cirrus_colorexpand_transp } index = (bits & bitmask); if (index) { - PUTPIXEL(); + PUTPIXEL(s, addr, col); } - d += (DEPTH / 8); + addr += (DEPTH / 8); bitmask >>= 1; } - dst += dstpitch; + dstaddr += dstpitch; } } static void glue(glue(glue(cirrus_colorexpand_, ROP_NAME), _),DEPTH) - (CirrusVGAState * s, uint8_t * dst, - const uint8_t * src, + (CirrusVGAState *s, uint32_t dstaddr, + const uint8_t *src, int dstpitch, int srcpitch, int bltwidth, int bltheight) { uint32_t colors[2]; - uint8_t *d; + uint32_t addr; int x, y; unsigned bits; unsigned int col; @@ -161,29 +163,29 @@ glue(glue(glue(cirrus_colorexpand_, ROP_ for(y = 0; y < bltheight; y++) { bitmask = 0x80 >> srcskipleft; bits = *src++; - d = dst + dstskipleft; + addr = dstaddr + dstskipleft; for (x = dstskipleft; x < bltwidth; x += (DEPTH / 8)) { if ((bitmask & 0xff) == 0) { bitmask = 0x80; bits = *src++; } col = colors[!!(bits & bitmask)]; - PUTPIXEL(); - d += (DEPTH / 8); + PUTPIXEL(s, addr, col); + addr += (DEPTH / 8); bitmask >>= 1; } - dst += dstpitch; + dstaddr += dstpitch; } } static void glue(glue(glue(cirrus_colorexpand_pattern_transp_, ROP_NAME), _),DEPTH) - (CirrusVGAState * s, uint8_t * dst, - const uint8_t * src, + (CirrusVGAState *s, uint32_t dstaddr, + const uint8_t *src, int dstpitch, int srcpitch, int bltwidth, int bltheight) { - uint8_t *d; + uint32_t addr; int x, y, bitpos, pattern_y; unsigned int bits, bits_xor; unsigned int col; @@ -207,28 +209,28 @@ glue(glue(glue(cirrus_colorexpand_patter for(y = 0; y < bltheight; y++) { bits = src[pattern_y] ^ bits_xor; bitpos = 7 - srcskipleft; - d = dst + dstskipleft; + addr = dstaddr + dstskipleft; for (x = dstskipleft; x < bltwidth; x += (DEPTH / 8)) { if ((bits >> bitpos) & 1) { - PUTPIXEL(); + PUTPIXEL(s, addr, col); } - d += (DEPTH / 8); + addr += (DEPTH / 8); bitpos = (bitpos - 1) & 7; } pattern_y = (pattern_y + 1) & 7; - dst += dstpitch; + dstaddr += dstpitch; } } static void glue(glue(glue(cirrus_colorexpand_pattern_, ROP_NAME), _),DEPTH) - (CirrusVGAState * s, uint8_t * dst, - const uint8_t * src, + (CirrusVGAState *s, uint32_t dstaddr, + const uint8_t *src, int dstpitch, int srcpitch, int bltwidth, int bltheight) { uint32_t colors[2]; - uint8_t *d; + uint32_t addr; int x, y, bitpos, pattern_y; unsigned int bits; unsigned int col; @@ -242,38 +244,37 @@ glue(glue(glue(cirrus_colorexpand_patter for(y = 0; y < bltheight; y++) { bits = src[pattern_y]; bitpos = 7 - srcskipleft; - d = dst + dstskipleft; + addr = dstaddr + dstskipleft; for (x = dstskipleft; x < bltwidth; x += (DEPTH / 8)) { col = colors[(bits >> bitpos) & 1]; - PUTPIXEL(); - d += (DEPTH / 8); + PUTPIXEL(s, addr, col); + addr += (DEPTH / 8); bitpos = (bitpos - 1) & 7; } pattern_y = (pattern_y + 1) & 7; - dst += dstpitch; + dstaddr += dstpitch; } } static void glue(glue(glue(cirrus_fill_, ROP_NAME), _),DEPTH) (CirrusVGAState *s, - uint8_t *dst, int dst_pitch, + uint32_t dstaddr, int dst_pitch, int width, int height) { - uint8_t *d, *d1; + uint32_t addr; uint32_t col; int x, y; col = s->cirrus_blt_fgcol; - d1 = dst; for(y = 0; y < height; y++) { - d = d1; + addr = dstaddr; for(x = 0; x < width; x += (DEPTH / 8)) { - PUTPIXEL(); - d += (DEPTH / 8); + PUTPIXEL(s, addr, col); + addr += (DEPTH / 8); } - d1 += dst_pitch; + dstaddr += dst_pitch; } }
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