File 0200-sm501-Set-updated-region-dirty-afte.patch of Package qemu.20395

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File 0200-sm501-Set-updated-region-dirty-afte.patch of Package qemu.20395

From: BALATON Zoltan <balaton@eik.bme.hu>
Date: Wed, 4 Jul 2018 11:40:58 +0200
Subject: sm501: Set updated region dirty after 2D operation

Git-commit: eb76243c9da613d0abc27eb38a0d47b82f7ca00b
References: bsc#1172385, CVE-2020-12829

Set the changed memory region dirty after performed a 2D operation to
ensure that the screen is updated properly.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/display/sm501.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/hw/display/sm501.c b/hw/display/sm501.c
index e4da6f0bfaa8837020fc0d6439a1..acce7c3dc2823220b82c07cf8882 100644
--- a/hw/display/sm501.c
+++ b/hw/display/sm501.c
@@ -697,12 +697,16 @@ 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;
+    uint32_t src_base = s->twoD_source_base & 0x03FFFFFF;
+    uint32_t dst_base = s->twoD_destination_base & 0x03FFFFFF;
 
     /* get frame buffer info */
-    uint8_t *src = s->local_mem + (s->twoD_source_base & 0x03FFFFFF);
-    uint8_t *dst = s->local_mem + (s->twoD_destination_base & 0x03FFFFFF);
+    uint8_t *src = s->local_mem + src_base;
+    uint8_t *dst = s->local_mem + dst_base;
     int src_width = s->twoD_pitch & 0x1FFF;
     int dst_width = (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);
 
     if (addressing != 0x0) {
         printf("%s: only XY addressing is supported.\n", __func__);
@@ -803,6 +807,15 @@ static void sm501_2d_operation(SM501State *s)
         abort();
         break;
     }
+
+    if (dst_base >= get_fb_addr(s, crt) &&
+        dst_base <= get_fb_addr(s, crt) + fb_len) {
+        int dst_len = MIN(fb_len, ((dst_y + operation_height - 1) * dst_width +
+                           dst_x + operation_width) * (1 << format_flags));
+        if (dst_len) {
+            memory_region_set_dirty(&s->local_mem_region, dst_base, dst_len);
+        }
+    }
 }
 
 static uint64_t sm501_system_config_read(void *opaque, hwaddr addr,

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File 0200-sm501-Set-updated-region-dirty-afte.patch of Package qemu.20395

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