| Message ID | 20190417052247.17809-3-alex@ghiti.fr (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Provide generic top-down mmap layout functions | expand |
On Wed, Apr 17, 2019 at 12:25 AM Alexandre Ghiti <alex@ghiti.fr> wrote: > > Each architecture has its own way to determine if a task is a compat task, > by using is_compat_task in arch_mmap_rnd, it allows more genericity and > then it prepares its moving to mm/. > > Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Acked-by: Kees Cook <keescook@chromium.org> -Kees > --- > arch/arm64/mm/mmap.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm64/mm/mmap.c b/arch/arm64/mm/mmap.c > index 842c8a5fcd53..ed4f9915f2b8 100644 > --- a/arch/arm64/mm/mmap.c > +++ b/arch/arm64/mm/mmap.c > @@ -54,7 +54,7 @@ unsigned long arch_mmap_rnd(void) > unsigned long rnd; > > #ifdef CONFIG_COMPAT > - if (test_thread_flag(TIF_32BIT)) > + if (is_compat_task()) > rnd = get_random_long() & ((1UL << mmap_rnd_compat_bits) - 1); > else > #endif > -- > 2.20.1 >
On 4/18/19 12:32 AM, Kees Cook wrote: > On Wed, Apr 17, 2019 at 12:25 AM Alexandre Ghiti <alex@ghiti.fr> wrote: >> Each architecture has its own way to determine if a task is a compat task, >> by using is_compat_task in arch_mmap_rnd, it allows more genericity and >> then it prepares its moving to mm/. >> >> Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> > Acked-by: Kees Cook <keescook@chromium.org> Thanks ! > -Kees > >> --- >> arch/arm64/mm/mmap.c | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/arch/arm64/mm/mmap.c b/arch/arm64/mm/mmap.c >> index 842c8a5fcd53..ed4f9915f2b8 100644 >> --- a/arch/arm64/mm/mmap.c >> +++ b/arch/arm64/mm/mmap.c >> @@ -54,7 +54,7 @@ unsigned long arch_mmap_rnd(void) >> unsigned long rnd; >> >> #ifdef CONFIG_COMPAT >> - if (test_thread_flag(TIF_32BIT)) >> + if (is_compat_task()) >> rnd = get_random_long() & ((1UL << mmap_rnd_compat_bits) - 1); >> else >> #endif >> -- >> 2.20.1 >> >
On Wed, Apr 17, 2019 at 01:22:38AM -0400, Alexandre Ghiti wrote: > Each architecture has its own way to determine if a task is a compat task, > by using is_compat_task in arch_mmap_rnd, it allows more genericity and > then it prepares its moving to mm/. > > Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> Looks good, Reviewed-by: Christoph Hellwig <hch@lst.de>
diff --git a/arch/arm64/mm/mmap.c b/arch/arm64/mm/mmap.c index 842c8a5fcd53..ed4f9915f2b8 100644 --- a/arch/arm64/mm/mmap.c +++ b/arch/arm64/mm/mmap.c @@ -54,7 +54,7 @@ unsigned long arch_mmap_rnd(void) unsigned long rnd; #ifdef CONFIG_COMPAT - if (test_thread_flag(TIF_32BIT)) + if (is_compat_task()) rnd = get_random_long() & ((1UL << mmap_rnd_compat_bits) - 1); else #endif
Each architecture has its own way to determine if a task is a compat task, by using is_compat_task in arch_mmap_rnd, it allows more genericity and then it prepares its moving to mm/. Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> --- arch/arm64/mm/mmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)