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| author | Francis Laniel <laniel_francis@privacyrequired.com> | 2020-11-15 18:08:05 +0100 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2020-11-16 08:08:54 -0800 |
| commit | 9ca718743ad8402958637bfc196d7b62371a1b9f (patch) | |
| tree | 89d5f226138c49fdd1bfd2116b28b2b469357280 /net | |
| parent | 8eeb99bc81bc1cb3d5e5323d9a82d8392e3a27b4 (diff) | |
| download | linux-9ca718743ad8402958637bfc196d7b62371a1b9f.tar.bz2 | |
Modify return value of nla_strlcpy to match that of strscpy.
nla_strlcpy now returns -E2BIG if src was truncated when written to dst.
It also returns this error value if dstsize is 0 or higher than INT_MAX.
For example, if src is "foo\0" and dst is 3 bytes long, the result will be:
1. "foG" after memcpy (G means garbage).
2. "fo\0" after memset.
3. -E2BIG is returned because src was not completely written into dst.
The callers of nla_strlcpy were modified to take into account this modification.
Signed-off-by: Francis Laniel <laniel_francis@privacyrequired.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sched/act_api.c | 2 | ||||
| -rw-r--r-- | net/sched/cls_api.c | 2 | ||||
| -rw-r--r-- | net/sched/sch_api.c | 2 |
3 files changed, 3 insertions, 3 deletions
diff --git a/net/sched/act_api.c b/net/sched/act_api.c index 60e1572ba606..fe540a89b16c 100644 --- a/net/sched/act_api.c +++ b/net/sched/act_api.c @@ -939,7 +939,7 @@ struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, NL_SET_ERR_MSG(extack, "TC action kind must be specified"); goto err_out; } - if (nla_strlcpy(act_name, kind, IFNAMSIZ) >= IFNAMSIZ) { + if (nla_strlcpy(act_name, kind, IFNAMSIZ) < 0) { NL_SET_ERR_MSG(extack, "TC action name too long"); goto err_out; } diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c index ba0715ee9eac..c2e9661e20d3 100644 --- a/net/sched/cls_api.c +++ b/net/sched/cls_api.c @@ -223,7 +223,7 @@ static inline u32 tcf_auto_prio(struct tcf_proto *tp) static bool tcf_proto_check_kind(struct nlattr *kind, char *name) { if (kind) - return nla_strlcpy(name, kind, IFNAMSIZ) >= IFNAMSIZ; + return nla_strlcpy(name, kind, IFNAMSIZ) < 0; memset(name, 0, IFNAMSIZ); return false; } diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index 2a76a2f5ed88..05449286d889 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -1170,7 +1170,7 @@ static struct Qdisc *qdisc_create(struct net_device *dev, #ifdef CONFIG_MODULES if (ops == NULL && kind != NULL) { char name[IFNAMSIZ]; - if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { + if (nla_strlcpy(name, kind, IFNAMSIZ) >= 0) { /* We dropped the RTNL semaphore in order to * perform the module load. So, even if we * succeeded in loading the module we have to |