From: Sasha Levin <sashal@kernel.org> To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Chang-Hsien Tsai <luke.tw@gmail.com>, Daniel Borkmann <daniel@iogearbox.net>, Sasha Levin <sashal@kernel.org>, netdev@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH AUTOSEL 4.14 02/35] samples, bpf: fix to change the buffer size for read() Date: Wed, 26 Jun 2019 20:38:50 -0400 Message-ID: <20190627003925.21330-2-sashal@kernel.org> (raw) In-Reply-To: <20190627003925.21330-1-sashal@kernel.org> From: Chang-Hsien Tsai <luke.tw@gmail.com> [ Upstream commit f7c2d64bac1be2ff32f8e4f500c6e5429c1003e0 ] If the trace for read is larger than 4096, the return value sz will be 4096. This results in off-by-one error on buf: static char buf[4096]; ssize_t sz; sz = read(trace_fd, buf, sizeof(buf)); if (sz > 0) { buf[sz] = 0; puts(buf); } Signed-off-by: Chang-Hsien Tsai <luke.tw@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Sasha Levin <sashal@kernel.org> --- samples/bpf/bpf_load.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/samples/bpf/bpf_load.c b/samples/bpf/bpf_load.c index 2325d7ad76df..e8e8b756dc52 100644 --- a/samples/bpf/bpf_load.c +++ b/samples/bpf/bpf_load.c @@ -613,7 +613,7 @@ void read_trace_pipe(void) static char buf[4096]; ssize_t sz; - sz = read(trace_fd, buf, sizeof(buf)); + sz = read(trace_fd, buf, sizeof(buf) - 1); if (sz > 0) { buf[sz] = 0; puts(buf); -- 2.20.1
next parent reply index Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <20190627003925.21330-1-sashal@kernel.org> 2019-06-27 0:38 ` Sasha Levin [this message] 2019-06-27 0:38 ` [PATCH AUTOSEL 4.14 03/35] bpf: sockmap, fix use after free from sleep in psock backlog workqueue Sasha Levin 2019-06-27 0:38 ` [PATCH AUTOSEL 4.14 05/35] mac80211: mesh: fix RCU warning Sasha Levin 2019-06-27 0:38 ` [PATCH AUTOSEL 4.14 06/35] mac80211: free peer keys before vif down in mesh Sasha Levin 2019-06-27 0:38 ` [PATCH AUTOSEL 4.14 07/35] mwifiex: Fix possible buffer overflows at parsing bss descriptor Sasha Levin 2019-06-27 0:38 ` [PATCH AUTOSEL 4.14 08/35] mwifiex: Abort at too short BSS descriptor element Sasha Levin 2019-06-27 0:38 ` [PATCH AUTOSEL 4.14 09/35] iwlwifi: Fix double-free problems in iwl_req_fw_callback() Sasha Levin 2019-06-27 0:38 ` [PATCH AUTOSEL 4.14 10/35] bpf: udp: Avoid calling reuseport's bpf_prog from udp_gro Sasha Levin 2019-06-27 0:38 ` [PATCH AUTOSEL 4.14 11/35] netfilter: ipv6: nf_defrag: fix leakage of unqueued fragments Sasha Levin 2019-06-27 0:39 ` [PATCH AUTOSEL 4.14 12/35] netfilter: ipv6: nf_defrag: accept duplicate fragments again Sasha Levin 2019-06-27 0:39 ` [PATCH AUTOSEL 4.14 13/35] dt-bindings: can: mcp251x: add mcp25625 support Sasha Levin 2019-06-27 0:39 ` [PATCH AUTOSEL 4.14 14/35] can: mcp251x: add support for mcp25625 Sasha Levin 2019-06-27 0:39 ` [PATCH AUTOSEL 4.14 15/35] can: m_can: implement errata "Needless activation of MRAF irq" Sasha Levin 2019-06-27 0:39 ` [PATCH AUTOSEL 4.14 16/35] can: af_can: Fix error path of can_init() Sasha Levin 2019-06-27 0:39 ` [PATCH AUTOSEL 4.14 17/35] ibmvnic: Refresh device multicast list after reset Sasha Levin 2019-06-27 0:39 ` [PATCH AUTOSEL 4.14 21/35] mlxsw: spectrum: Disallow prio-tagged packets when PVID is removed Sasha Levin 2019-06-27 0:39 ` [PATCH AUTOSEL 4.14 24/35] mac80211: only warn once on chanctx_conf being NULL Sasha Levin 2019-06-27 0:39 ` [PATCH AUTOSEL 4.14 25/35] qmi_wwan: add support for QMAP padding in the RX path Sasha Levin 2019-06-27 0:39 ` [PATCH AUTOSEL 4.14 26/35] qmi_wwan: avoid RCU stalls on device disconnect when in QMAP mode Sasha Levin 2019-06-27 0:39 ` [PATCH AUTOSEL 4.14 27/35] qmi_wwan: extend permitted QMAP mux_id value range Sasha Levin 2019-06-27 0:39 ` [PATCH AUTOSEL 4.14 29/35] bnx2x: Check if transceiver implements DDM before access Sasha Levin 2019-06-27 0:39 ` [PATCH AUTOSEL 4.14 31/35] ip6_tunnel: allow not to count pkts on tstats by passing dev as NULL Sasha Levin 2019-06-27 0:39 ` [PATCH AUTOSEL 4.14 32/35] net: lio_core: fix potential sign-extension overflow on large shift Sasha Levin 2019-06-27 0:39 ` [PATCH AUTOSEL 4.14 34/35] net: dsa: mv88e6xxx: fix shift of FID bits in mv88e6185_g1_vtu_loadpurge() Sasha Levin 2019-06-27 0:39 ` [PATCH AUTOSEL 4.14 35/35] net :sunrpc :clnt :Fix xps refcount imbalance on the error path Sasha Levin
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