I expect the fix for this to be shipped already and Ubuntu 18.04 is
reaching end-of-life in a few days. Considering both of these elements,
I'm going to mark this as Fix Released.
** Changed in: openssl (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1842383
Title:
openssl 1.1.1 memory overuse/leak
Status in openssl package in Ubuntu:
Fix Released
Bug description:
[Impact]
At some point in the past do_ssl3_write() used to return the number of
bytes written, or a value <= 0 on error.
With libssl1.11 it now just returns a success/
error code and writes the number of bytes written to |tmpwrit|.
The SSL_MODE_RELEASE_BUFFERS code was still looking at the return code
for the number of bytes written rather than |tmpwrit|. This has the effect
that the buffers are not released when they are supposed to be.
Thus such software as nginx currenty use significantly more memory
compared to libssl1.0.
[Test Case]
Use 'top' to measure the memory usage by nginx with ssl configured.
Example:
No memory overuse:
ii libssl1.1:amd64 1.1.0g-2ubuntu4 amd64 Secure Sockets Layer toolkit -
shared libraries
https://launchpadlibrarian.net/442818951/1.1.0g.png
2,5x memory overuse:
ii libssl1.1:amd64 1.1.1-1ubuntu2.1~18.04.4 amd64 Secure Sockets Layer
toolkit - shared libraries
https://launchpadlibrarian.net/442819146/1.1.1.png
[Regression Potential]
Low. This particular fix is tiny
(https://git.openssl.org/?p=openssl.git;a=commitdiff;h=f2bb79a) and
has been released and used in a couple of upstream openssl versions
already without issue.
[Other Info]
The fix has been tested by nginx team and it solved the memory overuse issue.
To manage notifications about this bug go to:
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