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| author |   Heiko Carstens <heiko.carstens@de.ibm.com> | 2013-03-21 08:24:11 +0100 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-03-21 13:35:38 +0100 |
| commit | b7fef2dd7217d9e3f35c948e87297451e55c9709 (patch) | |
| tree | 87bd5f483725152ca3f80046fd26517a9fc9068a /arch/s390/lib/uaccess_pt.c | |
| parent | s390/scm_blk: fix error return code in scm_blk_init() (diff) | |
| download | linux-dev-b7fef2dd7217d9e3f35c948e87297451e55c9709.tar.xz linux-dev-b7fef2dd7217d9e3f35c948e87297451e55c9709.zip | |
s390/uaccess: fix clear_user_pt()
The page table walker variant of clear_user() is supposed to copy the
contents of the empty zero page to user space.
However since 238ec4ef "[S390] zero page cache synonyms" empty_zero_page
is not anymore the page itself but contains the pointer to the empty zero
pages. Therefore the page table walker variant of clear_user() copied
the address of the first empty zero page and afterwards more or less
random data to user space instead of clearing the given user space range.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/lib/uaccess_pt.c')
| -rw-r--r-- | arch/s390/lib/uaccess_pt.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/lib/uaccess_pt.c b/arch/s390/lib/uaccess_pt.c index dff631d34b45..6771fdd89377 100644 --- a/arch/s390/lib/uaccess_pt.c +++ b/arch/s390/lib/uaccess_pt.c @@ -197,7 +197,7 @@ size_t copy_to_user_pt(size_t n, void __user *to, const void *from) static size_t clear_user_pt(size_t n, void __user *to) { - void *zpage = &empty_zero_page; + void *zpage = (void *) empty_zero_page; long done, size, ret; done = 0; |