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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2013-10-14 16:08:35 +0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-10-24 19:17:07 +0400 |
| commit | 57f47ba0cb74303230a373d27238a0aaa0df3775 (patch) | |
| tree | 92bea4736086a721aafd7d5d0fdcf31b5fc3ba97 /arch/s390/appldata/appldata_base.c | |
| parent | 041058a16a71a1257a1c3c19a55d74641912b918 (diff) | |
| download | linux-57f47ba0cb74303230a373d27238a0aaa0df3775.tar.xz | |
s390/appldata: make copy_from_user() invocations provably correct
Just change the type of "len" to unsigned int so the compiler can prove
that we don't have a buffer overflow (and generates less code).
We get rid of these:
In function 'copy_from_user',
inlined from 'appldata_interval_handler' at
arch/s390/appldata/appldata_base.c:265:
uaccess.h:303: warning: call to 'copy_from_user_overflow' declared
with attribute warning: copy_from_user() buffer size is not provably
correct
In function 'copy_from_user',
inlined from 'appldata_timer_handler' at
arch/s390/appldata/appldata_base.c:225:
uaccess.h:303: warning: call to 'copy_from_user_overflow' declared
with attribute warning: copy_from_user() buffer size is not provably
correct
In function 'copy_from_user',
inlined from 'appldata_generic_handler' at
arch/s390/appldata/appldata_base.c:333:
uaccess.h:303: warning: call to 'copy_from_user_overflow' declared
with attribute warning: copy_from_user() buffer size is not provably
correct
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/appldata/appldata_base.c')
| -rw-r--r-- | arch/s390/appldata/appldata_base.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/s390/appldata/appldata_base.c b/arch/s390/appldata/appldata_base.c index 87a22092b68f..603d2003cd9f 100644 --- a/arch/s390/appldata/appldata_base.c +++ b/arch/s390/appldata/appldata_base.c @@ -204,7 +204,7 @@ static int appldata_timer_handler(ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { - int len; + unsigned int len; char buf[2]; if (!*lenp || *ppos) { @@ -246,7 +246,8 @@ static int appldata_interval_handler(ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { - int len, interval; + unsigned int len; + int interval; char buf[16]; if (!*lenp || *ppos) { @@ -290,7 +291,8 @@ appldata_generic_handler(ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { struct appldata_ops *ops = NULL, *tmp_ops; - int rc, len, found; + unsigned int len; + int rc, found; char buf[2]; struct list_head *lh; |