On Fri, Sep 06, 2019 at 12:49:44AM +0100, Al Viro wrote:
> On Fri, Sep 06, 2019 at 09:00:03AM +1000, Aleksa Sarai wrote:
> > > > + return -EFAULT;
> > > > + }
> > > > + /* Copy the interoperable parts of the struct. */
>
On Fri, Sep 06, 2019 at 09:00:03AM +1000, Aleksa Sarai wrote:
> > > + return -EFAULT;
> > > + }
> > > + /* Copy the interoperable parts of the struct. */
> > > + if (__copy_to_user(dst, src, size))
> > > + return -EFAULT;
> >
> > Why not simply clear_user() and
On Fri, Sep 06, 2019 at 05:56:18AM +1000, Aleksa Sarai wrote:
> On 2019-09-05, Al Viro wrote:
> > On Thu, Sep 05, 2019 at 08:23:03PM +0200, Christian Brauner wrote:
> >
> > > Because every caller of that function right now has that limit set
> > > anyway iirc
On Thu, Sep 05, 2019 at 08:23:03PM +0200, Christian Brauner wrote:
> Because every caller of that function right now has that limit set
> anyway iirc. So we can either remove it from here and place it back for
> the individual callers or leave it in the helper.
> Also, I'm really asking, why not?
On Thu, Sep 05, 2019 at 06:19:22AM +1000, Aleksa Sarai wrote:
> +/*
> + * "memset(p, 0, size)" but for user space buffers. Caller must have already
> + * checked access_ok(p, size).
> + */
> +static int __memzero_user(void __user *p, size_t s)
> +{
> + const char zeros[BUFFER_SIZE] = {};
> +
On Wed, Sep 04, 2019 at 03:38:20PM -0700, Linus Torvalds wrote:
> On Wed, Sep 4, 2019 at 3:31 PM David Howells wrote:
> >
> > It ought to be reasonably easy to make them per-sb at least, I think. We
> > don't allow cross-super rename, right?
>
> Right now the sequence count handling very much
On Sun, Aug 04, 2019 at 12:47:36AM +0530, Souptick Joarder wrote:
> These are dead code since 2.6.11. If there is no plan to use
> it further, this can be removed forever.
What's the point in removing ifdefed-out debugging printks?
On Tue, Jul 16, 2019 at 10:40:46PM -0400, Rich Felker wrote:
> On Tue, Jul 16, 2019 at 06:27:17PM -0700, Palmer Dabbelt wrote:
> > man 3p says that fchmodat() takes a flags argument, but the Linux
> > syscall does not. There doesn't appear to be a good userspace
> > workaround for this issue but
On Tue, Jul 16, 2019 at 06:27:17PM -0700, Palmer Dabbelt wrote:
> -int do_fchmodat(int dfd, const char __user *filename, umode_t mode)
> +int do_fchmodat4(int dfd, const char __user *filename, umode_t mode, int
> flags)
> {
> struct path path;
> int error;
> - unsigned int
On Sun, Jul 14, 2019 at 05:00:29PM +1000, Aleksa Sarai wrote:
> The basic property being guaranteed by LOOKUP_IN_ROOT is that it will
> not result in resolution of a path component which was not inside the
> root of the dirfd tree at some point during resolution (and that all
> absolute symlink
On Sat, Jul 13, 2019 at 03:41:53AM +0100, Al Viro wrote:
> On Fri, Jul 12, 2019 at 04:00:26PM +0100, Al Viro wrote:
> > On Fri, Jul 12, 2019 at 02:25:53PM +0100, Al Viro wrote:
> >
> > > if (flags & LOOKUP_BENEATH) {
> > > nd->root = nd->pat
On Fri, Jul 12, 2019 at 04:00:26PM +0100, Al Viro wrote:
> On Fri, Jul 12, 2019 at 02:25:53PM +0100, Al Viro wrote:
>
> > if (flags & LOOKUP_BENEATH) {
> > nd->root = nd->path;
> > if (!(flags & LOOKUP_RCU))
> >
On Sun, Jul 07, 2019 at 12:57:27AM +1000, Aleksa Sarai wrote:
> Patch changelog:
> v9:
> * Replace resolveat(2) with openat2(2). [Linus]
> * Output a warning to dmesg if may_open_magiclink() is violated.
> * Add an openat2(O_CREAT) testcase.
One general note for the future, BTW: for
On Fri, Jul 12, 2019 at 02:25:53PM +0100, Al Viro wrote:
> if (flags & LOOKUP_BENEATH) {
> nd->root = nd->path;
> if (!(flags & LOOKUP_RCU))
> path_get(>root);
> else
>
On Fri, Jul 12, 2019 at 01:55:52PM +0100, Al Viro wrote:
> On Fri, Jul 12, 2019 at 01:39:24PM +0100, Al Viro wrote:
> > On Fri, Jul 12, 2019 at 08:57:45PM +1000, Aleksa Sarai wrote:
> >
> > > > > @@ -2350,9 +2400,11 @@ static const char *path_init(struct nameidata
On Fri, Jul 12, 2019 at 10:20:17PM +1000, Aleksa Sarai wrote:
> On 2019-07-12, Al Viro wrote:
> > On Sun, Jul 07, 2019 at 12:57:28AM +1000, Aleksa Sarai wrote:
> > > @@ -514,7 +516,14 @@ static void set_nameidata(struct nameidata *p, int
> > > dfd, struct filename
On Fri, Jul 12, 2019 at 01:39:24PM +0100, Al Viro wrote:
> On Fri, Jul 12, 2019 at 08:57:45PM +1000, Aleksa Sarai wrote:
>
> > > > @@ -2350,9 +2400,11 @@ static const char *path_init(struct nameidata
> > > > *nd, unsigned flags)
> > > >
On Fri, Jul 12, 2019 at 08:57:45PM +1000, Aleksa Sarai wrote:
> > > @@ -2350,9 +2400,11 @@ static const char *path_init(struct nameidata *nd,
> > > unsigned flags)
> > > s = ERR_PTR(error);
> > > return s;
> > > }
> > > - error = dirfd_path_init(nd);
> > > - if
On Fri, Jul 12, 2019 at 05:14:54AM +0100, Al Viro wrote:
> That's not quite guaranteed (it is possible to bind a symlink on top
> of a regular file, and you will get LOOKUP_JUMPED on the entry into
> trailing_symlink() when looking the result up). Moreover, why bother
> with LOOKUP
On Sun, Jul 07, 2019 at 12:57:32AM +1000, Aleksa Sarai wrote:
> @@ -1442,8 +1464,11 @@ static int follow_dotdot_rcu(struct nameidata *nd)
> struct inode *inode = nd->inode;
>
> while (1) {
> - if (path_equal(>path, >root))
> + if (path_equal(>path, >root)) {
On Sun, Jul 07, 2019 at 12:57:31AM +1000, Aleksa Sarai wrote:
> Previously, path_init's handling of *at(dfd, ...) was only done once,
> but with LOOKUP_BENEATH (and LOOKUP_IN_ROOT) we have to parse the
> initial nd->path at different times (before or after absolute path
> handling) depending on
On Sun, Jul 07, 2019 at 12:57:28AM +1000, Aleksa Sarai wrote:
> @@ -514,7 +516,14 @@ static void set_nameidata(struct nameidata *p, int dfd,
> struct filename *name)
> p->stack = p->internal;
> p->dfd = dfd;
> p->name = name;
> - p->total_link_count = old ?
On Tue, May 21, 2019 at 01:34:47PM +0200, Christian Brauner wrote:
> This adds the close_range() syscall. It allows to efficiently close a range
> of file descriptors up to all file descriptors of a calling task.
>
> The syscall came up in a recent discussion around the new mount API and
>
On Sun, Mar 10, 2019 at 03:40:20PM -0700, Linus Torvalds wrote:
> SYSCALL_DEFINE3(osf_readv, unsigned long, fd,
> const struct iovec __user *, vector, unsigned long, count)
> {
> -#ifdef CONFIG_OSF4_COMPAT
> - if (unlikely(personality(current->personality) == PER_OSF4))
> -
)
Al Viro (2):
alpha: use alpha_ni_syscall only for syscall zero
alpha: unify the glue for sigreturn-like syscalls
arch/alpha/kernel/entry.S | 53
arch/alpha/kernel/systbls.S | 318 ++--
2 files changed, 183
On Mon, Jul 16, 2018 at 03:53:53PM +0530, Firoz Khan wrote:
> It is correct to keep __IGNORE* entry in non uapi header
> asm/unistd.h while uapi/asm/unistd.h must hold information
> only useful for user space applications.
> diff --git a/arch/alpha/include/uapi/asm/unistd.h
>
On Fri, Aug 10, 2018 at 07:31:55PM -0700, Richard Henderson wrote:
> > +++ b/arch/alpha/kernel/entry.S
> > @@ -473,7 +473,7 @@ entSys:
> > bne $3, strace
> > beq $4, 1f
> > ldq $27, 0($5)
> > -1: jsr $26, ($27), alpha_ni_syscall
> > +1: jsr $26, ($27),
is that extra twist needed in case of syscall #0.
Let's keep it only for syscall #0 and replace the rest with sys_ni_syscall.
And use sys_ni_syscall for "number out range" in ptraced-call case, as
we'd been doing for normal codepath since 2.1.86...
Signed-off-by: Al Viro
---
d
On Tue, Jul 31, 2018 at 06:10:27PM +0200, Jann Horn wrote:
> +/*
> + * Most filesystems don't filter out bogus directory entry names, and
> userspace
> + * can get very confused by such names. Behave as if a low-level IO error had
> + * happened while reading directory entries.
> + */
> +bool
kernel_wait4() expects a userland address for status - it's only
rusage that goes as a kernel one (and needs a copyout afterwards)
Fixes: "osf_wait4: switch to kernel_wait4()"
Cc: sta...@vger.kernel.org # v4.12+
Signed-off-by: Al Viro
---
diff --git a/arch/alpha/kernel/osf_sys.c b/
On Mon, Jul 16, 2018 at 09:48:43PM +0200, Jann Horn wrote:
> When you e.g. run `find` on a directory for which getdents returns
> "filenames" that contain slashes, `find` passes those "filenames" back to
> the kernel, which then interprets them as paths. That could conceivably
> cause userspace to
On Mon, Jun 25, 2018 at 06:34:10PM +0200, Jann Horn wrote:
> + char tmp[32];
>
> - if (namelen > 32)
> + if (namelen < 0 || namelen > 32)
> namelen = 32;
>
> down_read(_sem);
> kname = utsname()->domainname;
> len = strnlen(kname, namelen);
> -
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