Hello,
I am not a kernel developer and I need much help in order to understand
a kernel Oops (the first of a series of three Oops). It is:
kernel tried to execute exec-protected page (f102) - exploit attempt? (uid:
0)
BUG: Unable to handle kernel instruction fetch
Faulting instruction
Hello Christophe,
Il giorno lun, 24/08/2020 alle 07.17 +0200, Christophe Leroy ha
scritto:
> Hello Giuseppe,
[...]
> The Oopses in the video are fixed in 5.9-rc2, see my response to your
> other mail.
Right, I just updated from git and rebuilt the kernel whith
CONFIG_VMAP_STACK not set and the
Hello,
Il giorno ven, 21/08/2020 alle 16.03 +0200, Christophe Leroy ha
scritto:
[...]
> Thanks.
>
> The Oops in the video shows that the issue is at 0x1bcac and msr
> value
> shows that Instruction MMU is disabled. So this corresponds to
> address
> 0xc001bcac. In the vmlinux you sent me this
Hello Cristophe,
Il giorno ven, 21/08/2020 alle 08.55 +0200, Christophe Leroy ha
scritto:
> Hi Giuseppe,
>
> Le 08/07/2020 à 20:44, Christophe Leroy a écrit :
> >
> > Le 08/07/2020 à 19:36, Giuseppe Sacco a écrit :
> > > Hi Cristophe,
> > >
> >
Hello Christophe,
Il giorno ven, 21/08/2020 alle 16.03 +0200, Christophe Leroy ha
scritto:
[...]
> Thanks.
>
> The Oops in the video shows that the issue is at 0x1bcac and msr
> value
> shows that Instruction MMU is disabled. So this corresponds to
> address
> 0xc001bcac. In the vmlinux you
Il giorno gio, 27/08/2020 alle 09.46 +0200, Giuseppe Sacco ha scritto:
> Il giorno gio, 27/08/2020 alle 00.28 +0200, Giuseppe Sacco ha scritto:
> > Hello Christophe,
> >
> > Il giorno mer, 26/08/2020 alle 15.53 +0200, Christophe Leroy ha
> > scritto:
> > [
Hello Christophe,
Il giorno mer, 26/08/2020 alle 15.53 +0200, Christophe Leroy ha
scritto:
[...]
> If there is no warning, then the issue is something else, bad luck.
>
> Could you increase the loglevel and try again both with and without
> VMAP_STACK ? Maybe we'll get more information on where
Il giorno gio, 27/08/2020 alle 00.28 +0200, Giuseppe Sacco ha scritto:
> Hello Christophe,
>
> Il giorno mer, 26/08/2020 alle 15.53 +0200, Christophe Leroy ha
> scritto:
> [...]
> > If there is no warning, then the issue is something else, bad luck.
> >
> >
Il giorno gio, 27/08/2020 alle 12.39 +0200, Christophe Leroy ha
scritto:
> Hi,
>
> Le 27/08/2020 à 10:28, Giuseppe Sacco a écrit :
[...]
> > Sorry, I made a mistake. The real problem is down, on the same
> > function, when it calls low_sleep_handler(). This is where the
Salut Cristophe,
Il giorno mer, 08/07/2020 alle 10.38 +0200, Christophe Leroy ha
scritto:
> Hi Giuseppe,
>
> Le 08/07/2020 à 09:59, Giuseppe Sacco a écrit :
> > Hello Cristophe,
> >
> > Il giorno mar, 07/07/2020 alle 17.34 +0200, Giuseppe Sacco ha
> > scrit
Hello Cristophe,
Il giorno mar, 07/07/2020 alle 17.34 +0200, Giuseppe Sacco ha scritto:
> Il giorno mar, 07/07/2020 alle 16.52 +0200, Christophe Leroy ha
> scritto:
> > Le 07/07/2020 à 16:03, Giuseppe Sacco a écrit :
> > > Hello Cristophe,
> > >
> > >
Hello,
while trying to debug a problem using git bisect, I am now at a point
where I cannot build the kernel at all. This is the error message I
get:
$ LANG=C make ARCH=powerpc \
CROSS_COMPILE=powerpc-linux- \
CONFIG_MODULE_COMPRESS_GZIP=true \
INSTALL_MOD_STRIP=1 CONFIG_MODULE_COMPRESS=1 \
Hi Cristophe,
Il giorno mer, 08/07/2020 alle 19.09 +0200, Christophe Leroy ha
scritto:
> Hi
>
> Le 08/07/2020 à 19:00, Giuseppe Sacco a écrit :
> > Hello,
> > while trying to debug a problem using git bisect, I am now at a point
> > where I cannot build the kerne
Hello,
I am testing linux on a quite old hardware, an Apple PowerBook G4
"Titanium IV". I used to run Debian on this machine, so I upgraded the
old operating system to the latest software and found that new kernels
do not boot.
I rebuilt natively (on the powerbook) a few kernels and found that
Hello Cristophe,
Il giorno mar, 07/07/2020 alle 15.35 +0200, Christophe Leroy ha
scritto:
> Hi,
> Le 07/07/2020 à 14:58, Giuseppe Sacco a écrit :
[...]
> > So, I am looking for help. How may I better investigate the
> > problem?
> > How may I crossbuild the kernel on
Il giorno mar, 07/07/2020 alle 16.52 +0200, Christophe Leroy ha
scritto:
>
> Le 07/07/2020 à 16:03, Giuseppe Sacco a écrit :
> > Hello Cristophe,
> >
> > > Can you tell which defconfig you use or provide your .config
> >
> > You may get the standard
> a pointer to the stack in that global storage area.
>
> To avoid a complete churn of the function, still use r1 as
> the pointer to the storage area during restore.
>
> Reported-by: Giuseppe Sacco
> Fixes: cd08f109e262 ("powerpc/32s: Enable CONFIG_VMAP_STA
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