[Bug analyzer/112977] -Wanalyzer-tainted-offset false positive seen on Linux kernel's drivers/scsi/aacraid/aachba.c

[dmalcolm at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112977

David Malcolm  changed:

   What|Removed |Added

 Status|UNCONFIRMED |RESOLVED
 Resolution|--- |FIXED

--- Comment #3 from David Malcolm  ---
Should be fixed on trunk for GCC 14 by the above patch; marking as resolved.

[Bug analyzer/112977] -Wanalyzer-tainted-offset false positive seen on Linux kernel's drivers/scsi/aacraid/aachba.c

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112977

--- Comment #2 from GCC Commits  ---
The master branch has been updated by David Malcolm :

https://gcc.gnu.org/g:e503f9aca9192654d83f141ae7865a3c9d90bf0d

commit r14-8391-ge503f9aca9192654d83f141ae7865a3c9d90bf0d
Author: David Malcolm 
Date:   Wed Jan 24 10:11:35 2024 -0500

analyzer: fix taint false +ve due to overzealous state purging [PR112977]

gcc/analyzer/ChangeLog:
PR analyzer/112977
* engine.cc (impl_region_model_context::on_liveness_change): Pass
m_ext_state to sm_state_map::on_liveness_change.
* program-state.cc (sm_state_map::on_svalue_leak): Guard removal
of map entry based on can_purge_p.
(sm_state_map::on_liveness_change): Add ext_state param.  Add
workaround for bad interaction between state purging and
alt-inherited sm-state.
* program-state.h (sm_state_map::on_liveness_change): Add
ext_state param.
* sm-taint.cc
(taint_state_machine::has_alt_get_inherited_state_p): New.
(taint_state_machine::can_purge_p): Return false for "has_lb" and
"has_ub".
* sm.h (state_machine::has_alt_get_inherited_state_p): New vfunc.

gcc/testsuite/ChangeLog:
PR analyzer/112977
* gcc.dg/plugin/plugin.exp: Add taint-pr112977.c.
* gcc.dg/plugin/taint-pr112977.c: New test.

Signed-off-by: David Malcolm 

[Bug analyzer/112977] -Wanalyzer-tainted-offset false positive seen on Linux kernel's drivers/scsi/aacraid/aachba.c

[dmalcolm at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112977

--- Comment #1 from David Malcolm  ---
Created attachment 56859
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56859=edit
Reduced reproducer (needs adding to plugin.exp)