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authorChen Gang <gang.chen@asianux.com>2013-05-27 13:55:13 +0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-05-28 12:35:28 +0400
commitd5b4c2f4938aaebc392669111385c3cf50dd309f (patch)
tree0e1f9dc2ea24500981a61d2adec13e46080a5a93 /arch/s390/appldata
parent9acf73b7d06eaa3fbfbfafc9c835f8fe0d751eff (diff)
downloadlinux-d5b4c2f4938aaebc392669111385c3cf50dd309f.tar.xz
arch: s390: appldata: using strncpy() and strnlen() instead of sprintf()
'buf[2]' is 2 bytes length, and sprintf() will append '\0' at the end of string "?\n", so original implementation is memory overflow. Need use strncpy() and strnlen() instead of sprintf(). Signed-off-by: Chen Gang <gang.chen@asianux.com> Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/appldata')
-rw-r--r--arch/s390/appldata/appldata_base.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/s390/appldata/appldata_base.c b/arch/s390/appldata/appldata_base.c
index bae0f402bf2a..87a22092b68f 100644
--- a/arch/s390/appldata/appldata_base.c
+++ b/arch/s390/appldata/appldata_base.c
@@ -212,7 +212,9 @@ appldata_timer_handler(ctl_table *ctl, int write,
return 0;
}
if (!write) {
- len = sprintf(buf, appldata_timer_active ? "1\n" : "0\n");
+ strncpy(buf, appldata_timer_active ? "1\n" : "0\n",
+ ARRAY_SIZE(buf));
+ len = strnlen(buf, ARRAY_SIZE(buf));
if (len > *lenp)
len = *lenp;
if (copy_to_user(buffer, buf, len))
@@ -317,7 +319,8 @@ appldata_generic_handler(ctl_table *ctl, int write,
return 0;
}
if (!write) {
- len = sprintf(buf, ops->active ? "1\n" : "0\n");
+ strncpy(buf, ops->active ? "1\n" : "0\n", ARRAY_SIZE(buf));
+ len = strnlen(buf, ARRAY_SIZE(buf));
if (len > *lenp)
len = *lenp;
if (copy_to_user(buffer, buf, len)) {