On Wed, Jan 24, 2024 at 2:49 PM Jeff Xu wrote:
>
> On Wed, Jan 24, 2024 at 12:06 PM Liam R. Howlett
> wrote:
> >
> > > Considering this is the MAP_FIXED case, and maybe that is not used
> > > that often in practice, I think this is acceptable performance-wise,
> > > unless you know another soluti
On Wed, Jan 24, 2024 at 12:06 PM Liam R. Howlett
wrote:
>
> * Jeff Xu [240124 12:50]:
> > On Tue, Jan 23, 2024 at 10:15 AM Liam R. Howlett
> > wrote:
> > >
> > > * jef...@chromium.org [240122 10:29]:
> > > > From: Jeff Xu
> > > >
> > > > The new mseal() is an syscall on 64 bit CPU, and with
>
Theo de Raadt wrote:
> This discussion about the malloc heap is ridiculous. Obviously it is
> programmer error to lock the permissions on memory you will free for
> reuse. But you can't fix this problem with malloc(), without breaking
> other extremely common circumstances where the allocation
Liam R. Howlett wrote:
> > Adding mseal() into picture, however, the heap is then sealed
> > partially, user can still free it, but the memory remains to be RO,
> > and the result of brk-shrink is nondeterministic, depending on if
> > munmap() will try to free the sealed memory.(brk uses munmap t
* Jeff Xu [240124 12:50]:
> On Tue, Jan 23, 2024 at 10:15 AM Liam R. Howlett
> wrote:
> >
> > * jef...@chromium.org [240122 10:29]:
> > > From: Jeff Xu
> > >
> > > The new mseal() is an syscall on 64 bit CPU, and with
> > > following signature:
> > >
> > > int mseal(void addr, size_t len, unsig
On Tue, Jan 23, 2024 at 10:15 AM Liam R. Howlett
wrote:
>
> * jef...@chromium.org [240122 10:29]:
> > From: Jeff Xu
> >
> > The new mseal() is an syscall on 64 bit CPU, and with
> > following signature:
> >
> > int mseal(void addr, size_t len, unsigned long flags)
> > addr/len: memory range.
> >
* jef...@chromium.org [240122 10:29]:
> From: Jeff Xu
>
> The new mseal() is an syscall on 64 bit CPU, and with
> following signature:
>
> int mseal(void addr, size_t len, unsigned long flags)
> addr/len: memory range.
> flags: reserved.
>
> mseal() blocks following operations for the given me
From: Jeff Xu
The new mseal() is an syscall on 64 bit CPU, and with
following signature:
int mseal(void addr, size_t len, unsigned long flags)
addr/len: memory range.
flags: reserved.
mseal() blocks following operations for the given memory range.
1> Unmapping, moving to another location, and
