[LU-16510] Provide an interim 'good' fortified memcpy from 6.1

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0, Lustre 2.15.3
• Severity: 3
• Assignee: Patrick Farrell (Inactive)
• Reporter: Shaun Tancheff

Description

The fortified memcpy() from kernel v5.11-11104-ga28a6e860c6c through v5.18-rc5-1405-g43213daed6d6 incorrectly reports a false positive.

 13:54:25 In function 'memcpy',
 13:54:25     inlined from 'lov_iocontrol' at /tmp/rpmbuild-lustre-jenkins-4fGYbbr1/BUILD/lustre-2.15.53_116_g5d22f15/lustre/lov/lov_obd.c:1057:4:
 13:54:25 include/linux/fortify-string.h:187:25: error: call to '__read_overflow2' declared with attribute error: detected read beyond size of object passed as 2nd parameter
 13:54:25   187 |                         __read_overflow2();
 13:54:25       |                         ^~~~~~~~~~~~~~~~~~

Issue Links

• is related to: LU-17545 memcpy: detected field-spanning write (size 64) of single field "&lp->lp_data->pb_info" at .../lnet/lnet/peer.c:2456 (size 16)