kerndat: ensure that the CRIU process is dumpable

[nviennot]

When running the CRIU binary is secure mode (because setuid, or setcap) the kernel sets the DUMPABLE property to 0. This in turn makes /proc/self/* root owned, preventing some of the kerndat logic to function properly.

This change ensures that the CRIU process is dumpable.

[codecov-commenter]

Codecov Report

Merging #1450 (1ef265f) into criu-dev (f1cc40c) will decrease coverage by 0.11%. The diff coverage is 23.58%.

:exclamation: Current head 1ef265f differs from pull request most recent head b16b1d0. Consider uploading reports for the commit b16b1d0 to get more accurate results

@@             Coverage Diff              @@
##           criu-dev    #1450      +/-   ##
============================================
- Coverage     68.77%   68.65%   -0.12%     
============================================
  Files           133      133              
  Lines         32319    32404      +85     
============================================
+ Hits          22227    22248      +21     
- Misses        10092    10156      +64     

Impacted Files	Coverage Δ
criu/include/util.h	100.00% <ø> (ø)
criu/lsm.c	29.62% <0.00%> (-1.34%)	:arrow_down:
criu/proc_parse.c	68.46% <ø> (ø)
criu/util.c	61.84% <2.17%> (-3.74%)	:arrow_down:
criu/cr-check.c	61.54% <16.66%> (-1.07%)	:arrow_down:
criu/kerndat.c	57.33% <83.33%> (+0.25%)	:arrow_up:
compel/src/lib/infect.c	55.27% <100.00%> (+0.35%)	:arrow_up:
criu/crtools.c	61.90% <100.00%> (ø)
criu/net.c	75.25% <100.00%> (+0.06%)	:arrow_up:
criu/sk-unix.c	74.22% <100.00%> (ø)
... and 5 more

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[github-actions[bot]]

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