xenfb: map framebuffer read-only and handle unmap errors
The framebuffer is needlessly mapped (PROT_READ | PROT_WRITE), map it PROT_READ instead. The framebuffer is unmapped by replacing the framebuffer pages with anonymous shared memory, calling mmap. Check for return errors and print a warning. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
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@ -495,7 +495,7 @@ static int xenfb_map_fb(struct XenFB *xenfb)
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munmap(map, n_fbdirs * XC_PAGE_SIZE);
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munmap(map, n_fbdirs * XC_PAGE_SIZE);
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xenfb->pixels = xc_map_foreign_pages(xen_xc, xenfb->c.xendev.dom,
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xenfb->pixels = xc_map_foreign_pages(xen_xc, xenfb->c.xendev.dom,
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PROT_READ | PROT_WRITE, fbmfns, xenfb->fbpages);
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PROT_READ, fbmfns, xenfb->fbpages);
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if (xenfb->pixels == NULL)
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if (xenfb->pixels == NULL)
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goto out;
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goto out;
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@ -903,6 +903,11 @@ static void fb_disconnect(struct XenDevice *xendev)
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fb->pixels = mmap(fb->pixels, fb->fbpages * XC_PAGE_SIZE,
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fb->pixels = mmap(fb->pixels, fb->fbpages * XC_PAGE_SIZE,
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PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANON,
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PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANON,
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-1, 0);
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-1, 0);
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if (fb->pixels == MAP_FAILED) {
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xen_be_printf(xendev, 0,
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"Couldn't replace the framebuffer with anonymous memory errno=%d\n",
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errno);
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}
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common_unbind(&fb->c);
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common_unbind(&fb->c);
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fb->feature_update = 0;
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fb->feature_update = 0;
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fb->bug_trigger = 0;
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fb->bug_trigger = 0;
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