[DTrace-devel] [PATCH 2/3] Ensure that 'execname' is not marked DPTR
Kris Van Hees
kris.van.hees at oracle.com
Thu Oct 6 16:20:58 UTC 2022
The 'execname' builtin variable is a notable exception to REF-type
variables being DTrace-managed pointers. It is a pointer into the
task_struct and therefore needs to be explicitly excluded from the
DPTR marking of variable nodes.
Signed-off-by: Kris Van Hees <kris.van.hees at oracle.com>
---
libdtrace/dt_parser.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/libdtrace/dt_parser.c b/libdtrace/dt_parser.c
index 6fc48c83..c718680e 100644
--- a/libdtrace/dt_parser.c
+++ b/libdtrace/dt_parser.c
@@ -2837,9 +2837,13 @@ dt_xcook_ident(dt_node_t *dnp, dt_idhash_t *dhp, uint_t idkind, int create)
* storage (DPTR), or if the type of the variable is a
* REF-type, we mark this variable node as a pointer to
* DTrace-managed storage (DPTR).
+ *
+ * We account for one notable exception: execname.
*/
- if ((idp->di_flags & DT_IDFLG_DPTR) ||
- (dnp->dn_flags & DT_NF_REF))
+ if (idp->di_flags & DT_IDFLG_DPTR)
+ dnp->dn_flags |= DT_NF_DPTR;
+ else if ((dnp->dn_flags & DT_NF_REF) &&
+ idp->di_id != DIF_VAR_EXECNAME)
dnp->dn_flags |= DT_NF_DPTR;
if (idp->di_flags & DT_IDFLG_WRITE)
--
2.37.2
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