| Message ID | 20201225062344.32566-1-rdunlap@infradead.org (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [-net] net: sched: prevent invalid Scell_log shift count | expand |
| Context | Check | Description |
|---|---|---|
| netdev/cover_letter | success | Link |
| netdev/fixes_present | success | Link |
| netdev/patch_count | success | Link |
| netdev/tree_selection | success | Clearly marked for net |
| netdev/subject_prefix | success | Link |
| netdev/cc_maintainers | success | CCed 7 of 7 maintainers |
| netdev/source_inline | success | Was 0 now: 0 |
| netdev/verify_signedoff | success | Link |
| netdev/module_param | success | Was 0 now: 0 |
| netdev/build_32bit | success | Errors and warnings before: 0 this patch: 0 |
| netdev/kdoc | success | Errors and warnings before: 0 this patch: 0 |
| netdev/verify_fixes | success | Link |
| netdev/checkpatch | warning | WARNING: line length of 84 exceeds 80 columns WARNING: line length of 85 exceeds 80 columns WARNING: line length of 87 exceeds 80 columns |
| netdev/build_allmodconfig_warn | success | Errors and warnings before: 0 this patch: 0 |
| netdev/header_inline | success | Link |
| netdev/stable | success | Stable not CCed |
From: Randy Dunlap <rdunlap@infradead.org> Date: Thu, 24 Dec 2020 22:23:44 -0800 > Check Scell_log shift size in red_check_params() and modify all callers > of red_check_params() to pass Scell_log. > > This prevents a shift out-of-bounds as detected by UBSAN: > UBSAN: shift-out-of-bounds in ./include/net/red.h:252:22 > shift exponent 72 is too large for 32-bit type 'int' > > Fixes: 8afa10cbe281 ("net_sched: red: Avoid illegal values") > Signed-off-by: Randy Dunlap <rdunlap@infradead.org> > Reported-by: syzbot+97c5bd9cc81eca63d36e@syzkaller.appspotmail.com Applied and queued up for -stable, thanks.
--- lnx-510.orig/include/net/red.h +++ lnx-510/include/net/red.h @@ -168,12 +168,14 @@ static inline void red_set_vars(struct r v->qcount = -1; } -static inline bool red_check_params(u32 qth_min, u32 qth_max, u8 Wlog) +static inline bool red_check_params(u32 qth_min, u32 qth_max, u8 Wlog, u8 Scell_log) { if (fls(qth_min) + Wlog > 32) return false; if (fls(qth_max) + Wlog > 32) return false; + if (Scell_log >= 32) + return false; if (qth_max < qth_min) return false; return true; --- lnx-510.orig/net/sched/sch_sfq.c +++ lnx-510/net/sched/sch_sfq.c @@ -647,7 +647,7 @@ static int sfq_change(struct Qdisc *sch, } if (ctl_v1 && !red_check_params(ctl_v1->qth_min, ctl_v1->qth_max, - ctl_v1->Wlog)) + ctl_v1->Wlog, ctl_v1->Scell_log)) return -EINVAL; if (ctl_v1 && ctl_v1->qth_min) { p = kmalloc(sizeof(*p), GFP_KERNEL); --- lnx-510.orig/net/sched/sch_choke.c +++ lnx-510/net/sched/sch_choke.c @@ -362,7 +362,7 @@ static int choke_change(struct Qdisc *sc ctl = nla_data(tb[TCA_CHOKE_PARMS]); - if (!red_check_params(ctl->qth_min, ctl->qth_max, ctl->Wlog)) + if (!red_check_params(ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Scell_log)) return -EINVAL; if (ctl->limit > CHOKE_MAX_QUEUE) --- lnx-510.orig/net/sched/sch_gred.c +++ lnx-510/net/sched/sch_gred.c @@ -480,7 +480,7 @@ static inline int gred_change_vq(struct struct gred_sched *table = qdisc_priv(sch); struct gred_sched_data *q = table->tab[dp]; - if (!red_check_params(ctl->qth_min, ctl->qth_max, ctl->Wlog)) { + if (!red_check_params(ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Scell_log)) { NL_SET_ERR_MSG_MOD(extack, "invalid RED parameters"); return -EINVAL; } --- lnx-510.orig/net/sched/sch_red.c +++ lnx-510/net/sched/sch_red.c @@ -250,7 +250,7 @@ static int __red_change(struct Qdisc *sc max_P = tb[TCA_RED_MAX_P] ? nla_get_u32(tb[TCA_RED_MAX_P]) : 0; ctl = nla_data(tb[TCA_RED_PARMS]); - if (!red_check_params(ctl->qth_min, ctl->qth_max, ctl->Wlog)) + if (!red_check_params(ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Scell_log)) return -EINVAL; err = red_get_flags(ctl->flags, TC_RED_HISTORIC_FLAGS,
Check Scell_log shift size in red_check_params() and modify all callers of red_check_params() to pass Scell_log. This prevents a shift out-of-bounds as detected by UBSAN: UBSAN: shift-out-of-bounds in ./include/net/red.h:252:22 shift exponent 72 is too large for 32-bit type 'int' Fixes: 8afa10cbe281 ("net_sched: red: Avoid illegal values") Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Reported-by: syzbot+97c5bd9cc81eca63d36e@syzkaller.appspotmail.com Cc: Nogah Frankel <nogahf@mellanox.com> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: Cong Wang <xiyou.wangcong@gmail.com> Cc: Jiri Pirko <jiri@resnulli.us> Cc: netdev@vger.kernel.org Cc: "David S. Miller" <davem@davemloft.net> Cc: Jakub Kicinski <kuba@kernel.org> --- include/net/red.h | 4 +++- net/sched/sch_choke.c | 2 +- net/sched/sch_gred.c | 2 +- net/sched/sch_red.c | 2 +- net/sched/sch_sfq.c | 2 +- 5 files changed, 7 insertions(+), 5 deletions(-)