Messages in this thread | | | Subject | Re: [RFC PATCH 09/10] powerpc/fsl_booke/kaslr: support nokaslr cmdline parameter | From | Christophe Leroy <> | Date | Mon, 29 Jul 2019 13:38:57 +0200 |
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Le 17/07/2019 à 10:06, Jason Yan a écrit : > One may want to disable kaslr when boot, so provide a cmdline parameter > 'nokaslr' to support this. > > Signed-off-by: Jason Yan <yanaijie@huawei.com> > Cc: Diana Craciun <diana.craciun@nxp.com> > Cc: Michael Ellerman <mpe@ellerman.id.au> > Cc: Christophe Leroy <christophe.leroy@c-s.fr> > Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> > Cc: Paul Mackerras <paulus@samba.org> > Cc: Nicholas Piggin <npiggin@gmail.com> > Cc: Kees Cook <keescook@chromium.org> > --- > arch/powerpc/kernel/kaslr_booke.c | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) > > diff --git a/arch/powerpc/kernel/kaslr_booke.c b/arch/powerpc/kernel/kaslr_booke.c > index 00339c05879f..e65a5d9d2ff1 100644 > --- a/arch/powerpc/kernel/kaslr_booke.c > +++ b/arch/powerpc/kernel/kaslr_booke.c > @@ -373,6 +373,18 @@ static unsigned long __init kaslr_choose_location(void *dt_ptr, phys_addr_t size > return kaslr_offset; > } > > +static inline __init bool kaslr_disabled(void) > +{ > + char *str; > + > + str = strstr(early_command_line, "nokaslr");
Why using early_command_line instead of boot_command_line ?
> + if ((str == early_command_line) || > + (str > early_command_line && *(str - 1) == ' '))
Is that stuff really needed ?
Why not just:
return strstr(early_command_line, "nokaslr") != NULL;
> + return true; > + > + return false; > +}
> + > /* > * To see if we need to relocate the kernel to a random offset > * void *dt_ptr - address of the device tree > @@ -388,6 +400,8 @@ notrace void __init kaslr_early_init(void *dt_ptr, phys_addr_t size) > kernel_sz = (unsigned long)_end - KERNELBASE; > > kaslr_get_cmdline(dt_ptr); > + if (kaslr_disabled()) > + return; > > offset = kaslr_choose_location(dt_ptr, size, kernel_sz); > >
Christophe
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