The patch titled
compat: fix uaccess handling
has been added to the -mm tree. Its filename is
compat-fix-uaccess-handling.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: compat: fix uaccess handling
From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
fs/compat.c | 35 +++++++++++++++++++----------------
fs/compat_ioctl.c | 33 ++++++++++++++++++++-------------
2 files changed, 39 insertions(+), 29 deletions(-)
diff -puN fs/compat.c~compat-fix-uaccess-handling fs/compat.c
--- a/fs/compat.c~compat-fix-uaccess-handling
+++ a/fs/compat.c
@@ -1142,7 +1142,9 @@ asmlinkage long compat_sys_getdents64(un
lastdirent = buf.previous;
if (lastdirent) {
typeof(lastdirent->d_off) d_off = file->f_pos;
- __put_user_unaligned(d_off, &lastdirent->d_off);
+ error = -EFAULT;
+ if (__put_user_unaligned(d_off, &lastdirent->d_off))
+ goto out_putf;
error = count - buf.count;
}
@@ -1609,14 +1611,14 @@ int compat_get_fd_set(unsigned long nr,
nr &= ~1UL;
while (nr) {
unsigned long h, l;
- __get_user(l, ufdset);
- __get_user(h, ufdset+1);
+ if (__get_user(l, ufdset) || __get_user(h, ufdset+1))
+ return -EFAULT;
ufdset += 2;
*fdset++ = h << 32 | l;
nr -= 2;
}
- if (odd)
- __get_user(*fdset, ufdset);
+ if (odd && __get_user(*fdset, ufdset))
+ return -EFAULT;
} else {
/* Tricky, must clear full unsigned long in the
* kernel fdset at the end, this makes sure that
@@ -1628,14 +1630,14 @@ int compat_get_fd_set(unsigned long nr,
}
static
-void compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
- unsigned long *fdset)
+int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
+ unsigned long *fdset)
{
unsigned long odd;
nr = ROUND_UP(nr, __COMPAT_NFDBITS);
if (!ufdset)
- return;
+ return 0;
odd = nr & 1UL;
nr &= ~1UL;
@@ -1643,13 +1645,14 @@ void compat_set_fd_set(unsigned long nr,
unsigned long h, l;
l = *fdset++;
h = l >> 32;
- __put_user(l, ufdset);
- __put_user(h, ufdset+1);
+ if (__put_user(l, ufdset) || __put_user(h, ufdset+1))
+ return -EFAULT;
ufdset += 2;
nr -= 2;
}
- if (odd)
- __put_user(*fdset, ufdset);
+ if (odd && __put_user(*fdset, ufdset))
+ return -EFAULT;
+ return 0;
}
@@ -1724,10 +1727,10 @@ int compat_core_sys_select(int n, compat
ret = 0;
}
- compat_set_fd_set(n, inp, fds.res_in);
- compat_set_fd_set(n, outp, fds.res_out);
- compat_set_fd_set(n, exp, fds.res_ex);
-
+ if (compat_set_fd_set(n, inp, fds.res_in) ||
+ compat_set_fd_set(n, outp, fds.res_out) ||
+ compat_set_fd_set(n, exp, fds.res_ex))
+ ret = -EFAULT;
out:
kfree(bits);
out_nofds:
diff -puN fs/compat_ioctl.c~compat-fix-uaccess-handling fs/compat_ioctl.c
--- a/fs/compat_ioctl.c~compat-fix-uaccess-handling
+++ a/fs/compat_ioctl.c
@@ -211,8 +211,10 @@ static int do_video_stillpicture(unsigne
up_native =
compat_alloc_user_space(sizeof(struct video_still_picture));
- put_user(compat_ptr(fp), &up_native->iFrame);
- put_user(size, &up_native->size);
+ err = put_user(compat_ptr(fp), &up_native->iFrame);
+ err |= put_user(size, &up_native->size);
+ if (err)
+ return -EFAULT;
err = sys_ioctl(fd, cmd, (unsigned long) up_native);
@@ -236,8 +238,10 @@ static int do_video_set_spu_palette(unsi
err |= get_user(length, &up->length);
up_native = compat_alloc_user_space(sizeof(struct video_spu_palette));
- put_user(compat_ptr(palp), &up_native->palette);
- put_user(length, &up_native->length);
+ err = put_user(compat_ptr(palp), &up_native->palette);
+ err |= put_user(length, &up_native->length);
+ if (err)
+ return -EFAULT;
err = sys_ioctl(fd, cmd, (unsigned long) up_native);
@@ -2043,16 +2047,19 @@ static int serial_struct_ioctl(unsigned
struct serial_struct ss;
mm_segment_t oldseg = get_fs();
__u32 udata;
+ unsigned int base;
if (cmd == TIOCSSERIAL) {
if (!access_ok(VERIFY_READ, ss32, sizeof(SS32)))
return -EFAULT;
if (__copy_from_user(&ss, ss32, offsetof(SS32, iomem_base)))
return -EFAULT;
- __get_user(udata, &ss32->iomem_base);
+ if (__get_user(udata, &ss32->iomem_base))
+ return -EFAULT;
ss.iomem_base = compat_ptr(udata);
- __get_user(ss.iomem_reg_shift, &ss32->iomem_reg_shift);
- __get_user(ss.port_high, &ss32->port_high);
+ if (__get_user(ss.iomem_reg_shift, &ss32->iomem_reg_shift) ||
+ __get_user(ss.port_high, &ss32->port_high))
+ return -EFAULT;
ss.iomap_base = 0UL;
}
set_fs(KERNEL_DS);
@@ -2063,12 +2070,12 @@ static int serial_struct_ioctl(unsigned
return -EFAULT;
if (__copy_to_user(ss32,&ss,offsetof(SS32,iomem_base)))
return -EFAULT;
- __put_user((unsigned long)ss.iomem_base >> 32 ?
- 0xffffffff : (unsigned)(unsigned long)ss.iomem_base,
- &ss32->iomem_base);
- __put_user(ss.iomem_reg_shift, &ss32->iomem_reg_shift);
- __put_user(ss.port_high, &ss32->port_high);
-
+ base = (unsigned long)ss.iomem_base >> 32 ?
+ 0xffffffff : (unsigned)(unsigned long)ss.iomem_base;
+ if (__put_user(base, &ss32->iomem_base) ||
+ __put_user(ss.iomem_reg_shift, &ss32->iomem_reg_shift) ||
+ __put_user(ss.port_high, &ss32->port_high))
+ return -EFAULT;
}
return err;
}
_
Patches currently in -mm which might be from heiko.carstens@xxxxxxxxxx are
cpu-topology-consider-sysfs_create_group-return-value.patch
git-s390.patch
scsi-target-needs-pci.patch
optional-zone_dma-for-s390.patch
binfmt-fix-uaccess-handling.patch
compat-fix-uaccess-handling.patch
net-fix-uaccess-handling.patch
profile-fix-uaccess-handling.patch
scsi-fix-uaccess-handling.patch
-
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