[PATCH 0/8] __builtin_dynamic_object_size and more

[Siddhesh Poyarekar]

On 10/8/21 03:44, Siddhesh Poyarekar wrote:
> (from about 4% to 70% in bash), but that could well be due to the _chk

I should also clarify that this is for memcpy.  For all fortifiable 
functions, the coverage percentage went from 30.81% to 84.5% for bash. 
Below is the full table.  Please note that this is only based on symbols 
emitted in the end as I didn't want to rebuild the _FORTIFIED_SOURCE=2 
binaries, so it does not take into account the fact that _chk could get 
folded to regular calls if we know at compile time that it's safe to do so.

No more posting patches at 4am; it only leads to more clarification 
follow-ups :/

   Func  	F(2)	U(2)	Cov(2)	F(3)	U(3)	Cov(3)
----------------------------------------------------------------
  asprintf	   1	   0	100.00%	   1	   0	100.00%
*confstr	   0	   2	  0.00%	   1	   1	 50.00%
  fdelt	          10	   0	100.00%	  10	   0	100.00%
*fgets	           0	   1	  0.00%	   1	   0	100.00%
  fprintf	  82	   0	100.00%	  82	   0	100.00%
  getcwd	           0	   3	  0.00%	   0	   3	  0.00%
*getgroups	   0	   1	  0.00%	   1	   0	100.00%
  gethostname	   0	   1	  0.00%	   0	   1	  0.00%
  longjmp	  23	   0	100.00%	  23	   0	100.00%
  mbsnrtowcs	   0	   2	  0.00%	   0	   2	  0.00%
*mbsrtowcs	   0	   1	  0.00%	   1	   0	100.00%
*mbstowcs	   0	  10	  0.00%	   5	   5	 50.00%
*memcpy	           7	 170	  3.95%	 116	  40	 74.36%
*memmove	   4	  21	 16.00%	  12	  17	 41.38%
*memset	           0	  24	  0.00%	   3	  21	 12.50%
  printf	         150	   0	100.00%	 150	   0	100.00%
*read	           0	  19	  0.00%	   8	  11	 42.11%
*readlink	   0	   3	  0.00%	   0	   3	  0.00%
  snprintf	  11	   0	100.00%	  11	   0	100.00%
  sprintf	  28	   0	100.00%	  28	   0	100.00%
*strcat 	   0	   5	  0.00%	   8	   0	100.00%
*strcpy 	   6	 440	  1.35%	 413	  36	 91.98%
*strncpy	   2	  52	  3.70%	  33	  19	 63.46%
  vfprintf	  14	   0	100.00%	  14	   0	100.00%
  vsnprintf	   4	   0	100.00%	   4	   0	100.00%
  wcrtomb	   0	   7	  0.00%	   0	   7	  0.00%
*wcsrtombs	   0	   3	  0.00%	   2	   1	 66.67%
  wctomb 	   0	   3	  0.00%	   0	   3	  0.00%
-----------------------------------------------------------------
Total   	 342	 768	 30.81%	927	 170	 84.50%