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| author | Chen Gang <gang.chen@asianux.com> | 2013-05-27 11:55:13 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-05-28 10:35:28 +0200 |
| commit | d5b4c2f4938aaebc392669111385c3cf50dd309f (patch) | |
| tree | 0e1f9dc2ea24500981a61d2adec13e46080a5a93 /arch/s390/appldata/appldata_base.c | |
| parent | s390/smp: lost IPIs on cpu hotplug (diff) | |
| download | linux-d5b4c2f4938aaebc392669111385c3cf50dd309f.tar.xz linux-d5b4c2f4938aaebc392669111385c3cf50dd309f.zip | |
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/appldata_base.c')
| -rw-r--r-- | arch/s390/appldata/appldata_base.c | 7 |
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)) { |