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<div class="moz-cite-prefix">On 3/26/2025 2:41 AM, Christian König
wrote:<br>
</div>
<blockquote type="cite" cite="mid:366587a4-9097-40d8-b21b-a2e82ae79476@amd.com">
<pre wrap="" class="moz-quote-pre">Am 26.03.25 um 03:59 schrieb Kasireddy, Vivek:
</pre>
<blockquote type="cite">
<pre wrap="" class="moz-quote-pre">Hi Christian,
</pre>
<blockquote type="cite">
<pre wrap="" class="moz-quote-pre">Subject: Re: [PATCH] udmabuf: fix a buf size overflow issue during udmabuf
creation
Am 25.03.25 um 07:23 schrieb Kasireddy, Vivek:
</pre>
<blockquote type="cite">
<pre wrap="" class="moz-quote-pre">Hi Christian,
</pre>
<blockquote type="cite">
<pre wrap="" class="moz-quote-pre">Am 21.03.25 um 17:41 schrieb Xiaogang.Chen:
</pre>
<blockquote type="cite">
<pre wrap="" class="moz-quote-pre">From: Xiaogang Chen <a class="moz-txt-link-rfc2396E" href="mailto:xiaogang.chen@amd.com"><xiaogang.chen@amd.com></a>
by casting size_limit_mb to u64 when calculate pglimit.
Signed-off-by: Xiaogang Chen<a class="moz-txt-link-rfc2396E" href="mailto:Xiaogang.Chen@amd.com"><Xiaogang.Chen@amd.com></a>
</pre>
</blockquote>
<pre wrap="" class="moz-quote-pre">Reviewed-by: Christian König <a class="moz-txt-link-rfc2396E" href="mailto:christian.koenig@amd.com"><christian.koenig@amd.com></a>
If nobody objects I'm going to push that to drm-misc-fixes.
</pre>
</blockquote>
<pre wrap="" class="moz-quote-pre">No objection but I wish the author would have added more details in the
</pre>
</blockquote>
<pre wrap="" class="moz-quote-pre">commit
</pre>
<blockquote type="cite">
<pre wrap="" class="moz-quote-pre">message particularly the value they have used to trigger the overflow. I
</pre>
</blockquote>
<pre wrap="" class="moz-quote-pre">guess
</pre>
<blockquote type="cite">
<pre wrap="" class="moz-quote-pre">Xiaogang can still comment here and briefly describe the exact use-
</pre>
</blockquote>
<pre wrap="" class="moz-quote-pre">case/test-case
</pre>
<blockquote type="cite">
<pre wrap="" class="moz-quote-pre">they are running where they encountered this issue.
</pre>
</blockquote>
<pre wrap="" class="moz-quote-pre">Isn't that obvious? At least it was for me.
As soon as you have a value larger than 4095 the 32bit multiplication
overflows, resulting in incorrectly limiting the buffer size.
</pre>
</blockquote>
<pre wrap="" class="moz-quote-pre">Right, that part makes sense. I was mostly curious about why or how they
were using such a large buffer (use-case details).
</pre>
</blockquote>
<pre wrap="" class="moz-quote-pre">
Well I suggested that we use udmabuf to implement shareable dma-bufs which can be allocated from a specific NUMA node and are also accounted in memcg.
But to be honest I have absolutely no idea what's the use case for a buffer larger than 4GiB.
Regards,
Christian.
</pre>
</blockquote>
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<w:LsdException Locked="false" Priority="48" Name="List Table 3 Accent 1"/>
<w:LsdException Locked="false" Priority="49" Name="List Table 4 Accent 1"/>
<w:LsdException Locked="false" Priority="50" Name="List Table 5 Dark Accent 1"/>
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<w:LsdException Locked="false" Priority="52"
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<w:LsdException Locked="false" Priority="46"
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<w:LsdException Locked="false" Priority="49" Name="List Table 4 Accent 2"/>
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<p class="MsoPlainText">Sorry, just noticed this email response. </p>
<p class="MsoPlainText">Application may allocate buf bigger than 4GB
and map to GPU
VM where shadder code uses the buffer. </p>
<p class="MsoPlainText"> Regards</p>
<p class="MsoPlainText">Xiaogang</p>
<blockquote type="cite" cite="mid:366587a4-9097-40d8-b21b-a2e82ae79476@amd.com">
<pre wrap="" class="moz-quote-pre">
</pre>
<blockquote type="cite">
<pre wrap="" class="moz-quote-pre">
Thanks,
Vivek
</pre>
<blockquote type="cite">
<pre wrap="" class="moz-quote-pre">Regards,
Christian.
</pre>
<blockquote type="cite">
<pre wrap="" class="moz-quote-pre">Thanks,
Vivek
</pre>
<blockquote type="cite">
<pre wrap="" class="moz-quote-pre">Regards,
Christian.
</pre>
<blockquote type="cite">
<pre wrap="" class="moz-quote-pre">---
drivers/dma-buf/udmabuf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c
index 8ce1f074c2d3..e99e3a65a470 100644
--- a/drivers/dma-buf/udmabuf.c
+++ b/drivers/dma-buf/udmabuf.c
@@ -398,7 +398,7 @@ static long udmabuf_create(struct miscdevice
</pre>
</blockquote>
<pre wrap="" class="moz-quote-pre">*device,
</pre>
<blockquote type="cite">
<pre wrap="" class="moz-quote-pre"> if (!ubuf)
return -ENOMEM;
- pglimit = (size_limit_mb * 1024 * 1024) >> PAGE_SHIFT;
+ pglimit = ((u64)size_limit_mb * 1024 * 1024) >> PAGE_SHIFT;
for (i = 0; i < head->count; i++) {
pgoff_t subpgcnt;
</pre>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
<pre wrap="" class="moz-quote-pre">
</pre>
</blockquote>
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