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Subject: bug#71694: 30.0.50; heap-use-after-free in tty_defined_color
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(message from Daniel Clemente on Fri, 21 Jun 2024 10:47:01 +0000)
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> From: Daniel Clemente <n142857@HIDDEN>
> Date: Fri, 21 Jun 2024 10:47:01 +0000
>
> I enabled -fsanitize. I'm using an X terminal to run TTY Emacs inside.
> I opened the daemon inside gdb with emacs --fg-daemon -Q
>
> I don't remember what exactly I was doing here, but it only involved
> slowly opening 2 or 3 terminals like this
> urxvt -e "emacsclient" "-c" "-e" '(dired "~")'
> and then I might have opened 2 or 3 with this (in the same session)
> xterm -e "emacsclient" "-c" "-e" '(dired "~")'
> Plus switching between them and closing them.
> However that's not a reproduction formula, it's just what I was doing
> when this crash randomly happened. I don't know how to reproduce this
> yet.
>
> =================================================================
> ==9677==ERROR: AddressSanitizer: heap-use-after-free on address
> 0x625000123b30 at pc 0x55555695b2c9 bp 0x7fffffff9900 sp
> 0x7fffffff98f8
> READ of size 1 at 0x625000123b30 thread T0
> #0 0x55555695b2c8 in tty_defined_color /w/emacs/src/xfaces.c:1115
I think this is bogus: -fsanitize doesn't understand the Emacs memory
management, in particular what's going in GC when we relocate strings.
In any case, the line numbers seem off: line 1115 of xfaces.c is a
comment. Are your sources in sync with the Git repository?
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Subject: bug#71694: 30.0.50; heap-use-after-free in tty_defined_color
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From: Daniel Clemente <n142857@HIDDEN>
Date: Wed, 26 Jun 2024 13:29:08 +0000
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On Fri, 21 Jun 2024 at 14:22, Eli Zaretskii <eliz@HIDDEN> wrote:
>
> > From: Daniel Clemente <n142857@HIDDEN>
> > Date: Fri, 21 Jun 2024 10:47:01 +0000
> >
> > I enabled -fsanitize. I'm using an X terminal to run TTY Emacs inside.
> > I opened the daemon inside gdb with emacs --fg-daemon -Q
> >
> > I don't remember what exactly I was doing here, but it only involved
> > slowly opening 2 or 3 terminals like this
> > urxvt -e "emacsclient" "-c" "-e" '(dired "~")'
> > and then I might have opened 2 or 3 with this (in the same session)
> > xterm -e "emacsclient" "-c" "-e" '(dired "~")'
> > Plus switching between them and closing them.
> > However that's not a reproduction formula, it's just what I was doing
> > when this crash randomly happened. I don't know how to reproduce this
> > yet.
> >
> > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > =3D=3D9677=3D=3DERROR: AddressSanitizer: heap-use-after-free on address
> > 0x625000123b30 at pc 0x55555695b2c9 bp 0x7fffffff9900 sp
> > 0x7fffffff98f8
> > READ of size 1 at 0x625000123b30 thread T0
> > #0 0x55555695b2c8 in tty_defined_color /w/emacs/src/xfaces.c:1115
>
> I think this is bogus: -fsanitize doesn't understand the Emacs memory
> management, in particular what's going in GC when we relocate strings.
>
I also used -fsanitize=3Dundefined,address,bounds-strict,float-cast-overflo=
w
without realizing that undefined+address seem to be incompatible;
sorry.
This -fsanitize =E2=80=9Enot understanding=E2=80=9C memory management could=
be
explained in etc/DEBUG. But this seems advanced so I guess developers
should just get more experience in Emacs memory management before
enabling this.
(You can close it you want).
> In any case, the line numbers seem off: line 1115 of xfaces.c is a
> comment. Are your sources in sync with the Git repository?
My sources were synchronized but my build was a few weeks old:
d9512da49514623ef3e35524dc894c06f2c0ce20
Line 1115 of xfaces.c was:
if (color_def->pixel =3D=3D FACE_TTY_DEFAULT_COLOR && *color_name)
in this context:
/* Defaults. */
color_def->pixel =3D FACE_TTY_DEFAULT_COLOR;
color_def->red =3D 0;
color_def->blue =3D 0;
color_def->green =3D 0;
if (*color_name)
status =3D tty_lookup_color (f, build_string (color_name), color_def, N=
ULL);
if (color_def->pixel =3D=3D FACE_TTY_DEFAULT_COLOR && *color_name)
{
if (strcmp (color_name, "unspecified-fg") =3D=3D 0)
color_def->pixel =3D FACE_TTY_DEFAULT_FG_COLOR;
else if (strcmp (color_name, "unspecified-bg") =3D=3D 0)
color_def->pixel =3D FACE_TTY_DEFAULT_BG_COLOR;
}
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Subject: bug#71694: closed (30.0.50; heap-use-after-free in tty_defined_color)
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Subject: Re: bug#71694: 30.0.50; heap-use-after-free in tty_defined_color
To: Daniel Clemente <n142857@HIDDEN>
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Daniel Clemente <n142857@HIDDEN> writes:
> On Fri, 21 Jun 2024 at 14:22, Eli Zaretskii <eliz@HIDDEN> wrote:
>>
>> > From: Daniel Clemente <n142857@HIDDEN>
>> > Date: Fri, 21 Jun 2024 10:47:01 +0000
>> >
>> > I enabled -fsanitize. I'm using an X terminal to run TTY Emacs inside.
>> > I opened the daemon inside gdb with emacs --fg-daemon -Q
>> >
>> > I don't remember what exactly I was doing here, but it only involved
>> > slowly opening 2 or 3 terminals like this
>> > urxvt -e "emacsclient" "-c" "-e" '(dired "~")'
>> > and then I might have opened 2 or 3 with this (in the same session)
>> > xterm -e "emacsclient" "-c" "-e" '(dired "~")'
>> > Plus switching between them and closing them.
>> > However that's not a reproduction formula, it's just what I was doing
>> > when this crash randomly happened. I don't know how to reproduce this
>> > yet.
>> >
>> > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>> > =3D=3D9677=3D=3DERROR: AddressSanitizer: heap-use-after-free on addres=
s
>> > 0x625000123b30 at pc 0x55555695b2c9 bp 0x7fffffff9900 sp
>> > 0x7fffffff98f8
>> > READ of size 1 at 0x625000123b30 thread T0
>> > #0 0x55555695b2c8 in tty_defined_color /w/emacs/src/xfaces.c:1115
>>
>> I think this is bogus: -fsanitize doesn't understand the Emacs memory
>> management, in particular what's going in GC when we relocate strings.
>>
>
> I also used -fsanitize=3Dundefined,address,bounds-strict,float-cast-overf=
low
> without realizing that undefined+address seem to be incompatible;
> sorry.
>
> This -fsanitize =E2=80=9Enot understanding=E2=80=9C memory management cou=
ld be
> explained in etc/DEBUG. But this seems advanced so I guess developers
> should just get more experience in Emacs memory management before
> enabling this.
>
> (You can close it you want).
It seems like the outstanding questions here were resolved.
I'm therefore closing this bug report.
>
>> In any case, the line numbers seem off: line 1115 of xfaces.c is a
>> comment. Are your sources in sync with the Git repository?
>
> My sources were synchronized but my build was a few weeks old:
> d9512da49514623ef3e35524dc894c06f2c0ce20
>
> Line 1115 of xfaces.c was:
> if (color_def->pixel =3D=3D FACE_TTY_DEFAULT_COLOR && *color_name)
> in this context:
>
> /* Defaults. */
> color_def->pixel =3D FACE_TTY_DEFAULT_COLOR;
> color_def->red =3D 0;
> color_def->blue =3D 0;
> color_def->green =3D 0;
>
> if (*color_name)
> status =3D tty_lookup_color (f, build_string (color_name), color_def,=
NULL);
>
> if (color_def->pixel =3D=3D FACE_TTY_DEFAULT_COLOR && *color_name)
> {
> if (strcmp (color_name, "unspecified-fg") =3D=3D 0)
> color_def->pixel =3D FACE_TTY_DEFAULT_FG_COLOR;
> else if (strcmp (color_name, "unspecified-bg") =3D=3D 0)
> color_def->pixel =3D FACE_TTY_DEFAULT_BG_COLOR;
> }
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To: Daniel Clemente <n142857@HIDDEN>
Subject: bug#71694: closed (Re: bug#71694: 30.0.50; heap-use-after-free in
tty_defined_color)
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Your bug report
#71694: 30.0.50; heap-use-after-free in tty_defined_color
which was filed against the emacs package, has been closed.
The explanation is attached below, along with your original report.
If you require more details, please reply to 71694 <at> debbugs.gnu.org.
--=20
71694: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D71694
GNU Bug Tracking System
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From: Stefan Kangas <stefankangas@HIDDEN>
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Subject: Re: bug#71694: 30.0.50; heap-use-after-free in tty_defined_color
To: Daniel Clemente <n142857@HIDDEN>
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Daniel Clemente <n142857@HIDDEN> writes:
> On Fri, 21 Jun 2024 at 14:22, Eli Zaretskii <eliz@HIDDEN> wrote:
>>
>> > From: Daniel Clemente <n142857@HIDDEN>
>> > Date: Fri, 21 Jun 2024 10:47:01 +0000
>> >
>> > I enabled -fsanitize. I'm using an X terminal to run TTY Emacs inside.
>> > I opened the daemon inside gdb with emacs --fg-daemon -Q
>> >
>> > I don't remember what exactly I was doing here, but it only involved
>> > slowly opening 2 or 3 terminals like this
>> > urxvt -e "emacsclient" "-c" "-e" '(dired "~")'
>> > and then I might have opened 2 or 3 with this (in the same session)
>> > xterm -e "emacsclient" "-c" "-e" '(dired "~")'
>> > Plus switching between them and closing them.
>> > However that's not a reproduction formula, it's just what I was doing
>> > when this crash randomly happened. I don't know how to reproduce this
>> > yet.
>> >
>> > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>> > =3D=3D9677=3D=3DERROR: AddressSanitizer: heap-use-after-free on addres=
s
>> > 0x625000123b30 at pc 0x55555695b2c9 bp 0x7fffffff9900 sp
>> > 0x7fffffff98f8
>> > READ of size 1 at 0x625000123b30 thread T0
>> > #0 0x55555695b2c8 in tty_defined_color /w/emacs/src/xfaces.c:1115
>>
>> I think this is bogus: -fsanitize doesn't understand the Emacs memory
>> management, in particular what's going in GC when we relocate strings.
>>
>
> I also used -fsanitize=3Dundefined,address,bounds-strict,float-cast-overf=
low
> without realizing that undefined+address seem to be incompatible;
> sorry.
>
> This -fsanitize =E2=80=9Enot understanding=E2=80=9C memory management cou=
ld be
> explained in etc/DEBUG. But this seems advanced so I guess developers
> should just get more experience in Emacs memory management before
> enabling this.
>
> (You can close it you want).
It seems like the outstanding questions here were resolved.
I'm therefore closing this bug report.
>
>> In any case, the line numbers seem off: line 1115 of xfaces.c is a
>> comment. Are your sources in sync with the Git repository?
>
> My sources were synchronized but my build was a few weeks old:
> d9512da49514623ef3e35524dc894c06f2c0ce20
>
> Line 1115 of xfaces.c was:
> if (color_def->pixel =3D=3D FACE_TTY_DEFAULT_COLOR && *color_name)
> in this context:
>
> /* Defaults. */
> color_def->pixel =3D FACE_TTY_DEFAULT_COLOR;
> color_def->red =3D 0;
> color_def->blue =3D 0;
> color_def->green =3D 0;
>
> if (*color_name)
> status =3D tty_lookup_color (f, build_string (color_name), color_def,=
NULL);
>
> if (color_def->pixel =3D=3D FACE_TTY_DEFAULT_COLOR && *color_name)
> {
> if (strcmp (color_name, "unspecified-fg") =3D=3D 0)
> color_def->pixel =3D FACE_TTY_DEFAULT_FG_COLOR;
> else if (strcmp (color_name, "unspecified-bg") =3D=3D 0)
> color_def->pixel =3D FACE_TTY_DEFAULT_BG_COLOR;
> }
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