* Re: feature/asan-gc-poisoning aa9ca2c1493 2/2: src/alloc.c: Fix incorrect pointer arithmetic. [not found] ` <20221204171657.3636BC00B0F@vcs2.savannah.gnu.org> @ 2022-12-05 1:13 ` Po Lu 2022-12-05 13:06 ` Eli Zaretskii 0 siblings, 1 reply; 3+ messages in thread From: Po Lu @ 2022-12-05 1:13 UTC (permalink / raw) To: emacs-devel; +Cc: Vibhav Pant Vibhav Pant <vibhavp@gmail.com> writes: > branch: feature/asan-gc-poisoning > commit aa9ca2c1493f1cd9d50698747fd054b1be53dc95 > Author: Vibhav Pant <vibhavp@gmail.com> > Commit: Vibhav Pant <vibhavp@gmail.com> > > src/alloc.c: Fix incorrect pointer arithmetic. > > * src/alloc.c (live_float_holding): Use parenthesis around the > pointer arithmetic expression to untag 'cp' correctly. > --- > src/alloc.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/src/alloc.c b/src/alloc.c > index 31108837e5a..6b8a4cdcc02 100644 > --- a/src/alloc.c > +++ b/src/alloc.c > @@ -5104,7 +5104,7 @@ live_float_holding (struct mem_node *m, void *p) > && (b != float_block > || offset / sizeof b->floats[0] < float_block_index)) > { > - struct Lisp_Float *f = (struct Lisp_Float *) cp - off; > + struct Lisp_Float *f = (struct Lisp_Float *) (cp - off); > #if GC_ASAN_POISON_OBJECTS > if (__asan_region_is_poisoned (f, sizeof (*f))) > return NULL; This is a problem on master and emacs-29 too, right? ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: feature/asan-gc-poisoning aa9ca2c1493 2/2: src/alloc.c: Fix incorrect pointer arithmetic. 2022-12-05 1:13 ` feature/asan-gc-poisoning aa9ca2c1493 2/2: src/alloc.c: Fix incorrect pointer arithmetic Po Lu @ 2022-12-05 13:06 ` Eli Zaretskii 2022-12-05 20:01 ` Vibhav Pant 0 siblings, 1 reply; 3+ messages in thread From: Eli Zaretskii @ 2022-12-05 13:06 UTC (permalink / raw) To: Po Lu; +Cc: emacs-devel, vibhavp > From: Po Lu <luangruo@yahoo.com> > Cc: Vibhav Pant <vibhavp@gmail.com> > Date: Mon, 05 Dec 2022 09:13:59 +0800 > > Vibhav Pant <vibhavp@gmail.com> writes: > > > branch: feature/asan-gc-poisoning > > commit aa9ca2c1493f1cd9d50698747fd054b1be53dc95 > > Author: Vibhav Pant <vibhavp@gmail.com> > > Commit: Vibhav Pant <vibhavp@gmail.com> > > > > src/alloc.c: Fix incorrect pointer arithmetic. > > > > * src/alloc.c (live_float_holding): Use parenthesis around the > > pointer arithmetic expression to untag 'cp' correctly. > > --- > > src/alloc.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/src/alloc.c b/src/alloc.c > > index 31108837e5a..6b8a4cdcc02 100644 > > --- a/src/alloc.c > > +++ b/src/alloc.c > > @@ -5104,7 +5104,7 @@ live_float_holding (struct mem_node *m, void *p) > > && (b != float_block > > || offset / sizeof b->floats[0] < float_block_index)) > > { > > - struct Lisp_Float *f = (struct Lisp_Float *) cp - off; > > + struct Lisp_Float *f = (struct Lisp_Float *) (cp - off); > > #if GC_ASAN_POISON_OBJECTS > > if (__asan_region_is_poisoned (f, sizeof (*f))) > > return NULL; > > This is a problem on master and emacs-29 too, right? I don't think so: there are no such code on those two branches, AFAICT. ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: feature/asan-gc-poisoning aa9ca2c1493 2/2: src/alloc.c: Fix incorrect pointer arithmetic. 2022-12-05 13:06 ` Eli Zaretskii @ 2022-12-05 20:01 ` Vibhav Pant 0 siblings, 0 replies; 3+ messages in thread From: Vibhav Pant @ 2022-12-05 20:01 UTC (permalink / raw) To: Eli Zaretskii; +Cc: Po Lu, emacs-devel Yup, this shouldn't be needed for either branches. I had added the additional variable to aid readability with __asan_region_is_poisoned. Thanks, Vibhav On Mon, Dec 5, 2022 at 6:36 PM Eli Zaretskii <eliz@gnu.org> wrote: > > > From: Po Lu <luangruo@yahoo.com> > > Cc: Vibhav Pant <vibhavp@gmail.com> > > Date: Mon, 05 Dec 2022 09:13:59 +0800 > > > > Vibhav Pant <vibhavp@gmail.com> writes: > > > > > branch: feature/asan-gc-poisoning > > > commit aa9ca2c1493f1cd9d50698747fd054b1be53dc95 > > > Author: Vibhav Pant <vibhavp@gmail.com> > > > Commit: Vibhav Pant <vibhavp@gmail.com> > > > > > > src/alloc.c: Fix incorrect pointer arithmetic. > > > > > > * src/alloc.c (live_float_holding): Use parenthesis around the > > > pointer arithmetic expression to untag 'cp' correctly. > > > --- > > > src/alloc.c | 2 +- > > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > > > diff --git a/src/alloc.c b/src/alloc.c > > > index 31108837e5a..6b8a4cdcc02 100644 > > > --- a/src/alloc.c > > > +++ b/src/alloc.c > > > @@ -5104,7 +5104,7 @@ live_float_holding (struct mem_node *m, void *p) > > > && (b != float_block > > > || offset / sizeof b->floats[0] < float_block_index)) > > > { > > > - struct Lisp_Float *f = (struct Lisp_Float *) cp - off; > > > + struct Lisp_Float *f = (struct Lisp_Float *) (cp - off); > > > #if GC_ASAN_POISON_OBJECTS > > > if (__asan_region_is_poisoned (f, sizeof (*f))) > > > return NULL; > > > > This is a problem on master and emacs-29 too, right? > > I don't think so: there are no such code on those two branches, AFAICT. -- Vibhav Pant vibhavp@gmail.com GPG: 7ED1 D48C 513C A024 BE3A 785F E3FB 28CB 6AB5 9598 ^ permalink raw reply [flat|nested] 3+ messages in thread
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[not found] ` <20221204171657.3636BC00B0F@vcs2.savannah.gnu.org>
2022-12-05 1:13 ` feature/asan-gc-poisoning aa9ca2c1493 2/2: src/alloc.c: Fix incorrect pointer arithmetic Po Lu
2022-12-05 13:06 ` Eli Zaretskii
2022-12-05 20:01 ` Vibhav Pant
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