From: Sasha Levin <sashal@kernel.org> To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Matteo Croce <mcroce@redhat.com>, Daniel Borkmann <daniel@iogearbox.net>, Sasha Levin <sashal@kernel.org>, netdev@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH AUTOSEL 5.1 10/95] samples, bpf: suppress compiler warning Date: Wed, 26 Jun 2019 20:28:55 -0400 Message-ID: <20190627003021.19867-10-sashal@kernel.org> (raw) In-Reply-To: <20190627003021.19867-1-sashal@kernel.org> From: Matteo Croce <mcroce@redhat.com> [ Upstream commit a195cefff49f60054998333e81ee95170ce8bf92 ] GCC 9 fails to calculate the size of local constant strings and produces a false positive: samples/bpf/task_fd_query_user.c: In function ‘test_debug_fs_uprobe’: samples/bpf/task_fd_query_user.c:242:67: warning: ‘%s’ directive output may be truncated writing up to 255 bytes into a region of size 215 [-Wformat-truncation=] 242 | snprintf(buf, sizeof(buf), "/sys/kernel/debug/tracing/events/%ss/%s/id", | ^~ 243 | event_type, event_alias); | ~~~~~~~~~~~ samples/bpf/task_fd_query_user.c:242:2: note: ‘snprintf’ output between 45 and 300 bytes into a destination of size 256 242 | snprintf(buf, sizeof(buf), "/sys/kernel/debug/tracing/events/%ss/%s/id", | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 243 | event_type, event_alias); | ~~~~~~~~~~~~~~~~~~~~~~~~ Workaround this by lowering the buffer size to a reasonable value. Related GCC Bugzilla: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83431 Signed-off-by: Matteo Croce <mcroce@redhat.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Sasha Levin <sashal@kernel.org> --- samples/bpf/task_fd_query_user.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/samples/bpf/task_fd_query_user.c b/samples/bpf/task_fd_query_user.c index aff2b4ae914e..e39938058223 100644 --- a/samples/bpf/task_fd_query_user.c +++ b/samples/bpf/task_fd_query_user.c @@ -216,7 +216,7 @@ static int test_debug_fs_uprobe(char *binary_path, long offset, bool is_return) { const char *event_type = "uprobe"; struct perf_event_attr attr = {}; - char buf[256], event_alias[256]; + char buf[256], event_alias[sizeof("test_1234567890")]; __u64 probe_offset, probe_addr; __u32 len, prog_id, fd_type; int err, res, kfd, efd; -- 2.20.1
next prev parent reply index Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <20190627003021.19867-1-sashal@kernel.org> 2019-06-27 0:28 ` [PATCH AUTOSEL 5.1 08/95] bpf: fix out-of-bounds read in __bpf_skc_lookup Sasha Levin 2019-06-27 0:28 ` [PATCH AUTOSEL 5.1 09/95] samples, bpf: fix to change the buffer size for read() Sasha Levin 2019-06-27 0:28 ` Sasha Levin [this message] 2019-06-27 0:28 ` [PATCH AUTOSEL 5.1 11/95] bpf, riscv: clear target register high 32-bits for and/or/xor on ALU32 Sasha Levin 2019-06-27 0:28 ` [PATCH AUTOSEL 5.1 12/95] bpf: sockmap, restore sk_write_space when psock gets dropped Sasha Levin 2019-06-27 0:28 ` [PATCH AUTOSEL 5.1 13/95] mac80211: fix rate reporting inside cfg80211_calculate_bitrate_he() Sasha Levin 2019-06-27 0:28 ` [PATCH AUTOSEL 5.1 14/95] bpf: sockmap, fix use after free from sleep in psock backlog workqueue Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 19/95] mac80211: mesh: fix RCU warning Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 20/95] mac80211: free peer keys before vif down in mesh Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 22/95] mwifiex: Fix possible buffer overflows at parsing bss descriptor Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 23/95] mwifiex: Abort at too short BSS descriptor element Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 24/95] bpf, riscv: clear high 32 bits for ALU32 add/sub/neg/lsh/rsh/arsh Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 25/95] iwlwifi: fix load in rfkill flow for unified firmware Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 26/95] iwlwifi: clear persistence bit according to device family Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 27/95] iwlwifi: fix AX201 killer sku loading firmware issue Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 28/95] iwlwifi: Fix double-free problems in iwl_req_fw_callback() Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 29/95] mwifiex: Fix heap overflow in mwifiex_uap_parse_tail_ies() Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 30/95] bpf: udp: ipv6: Avoid running reuseport's bpf_prog from __udp6_lib_err Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 31/95] bpf: udp: Avoid calling reuseport's bpf_prog from udp_gro Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 32/95] netfilter: ipv6: nf_defrag: fix leakage of unqueued fragments Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 33/95] tools: bpftool: Fix JSON output when lookup fails Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 36/95] netfilter: ipv6: nf_defrag: accept duplicate fragments again Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 37/95] dt-bindings: can: mcp251x: add mcp25625 support Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 38/95] can: mcp251x: add support for mcp25625 Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 39/95] can: m_can: implement errata "Needless activation of MRAF irq" Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 40/95] can: af_can: Fix error path of can_init() Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 41/95] can: flexcan: Remove unneeded registration message Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 42/95] net: phy: rename Asix Electronics PHY driver Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 43/95] ibmvnic: Do not close unopened driver during reset Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 44/95] ibmvnic: Refresh device multicast list after reset Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 45/95] ibmvnic: Fix unchecked return codes of memory allocations Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 48/95] bpf: lpm_trie: check left child of last leftmost node for NULL Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 54/95] xdp: check device pointer before clearing Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 56/95] mlxsw: spectrum: Disallow prio-tagged packets when PVID is removed Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 58/95] bpf: fix div64 overflow tests to properly detect errors Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 64/95] mac80211: only warn once on chanctx_conf being NULL Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 65/95] mac80211: do not start any work during reconfigure flow Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 66/95] cfg80211: util: fix bit count off by one Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 67/95] cfg80211: report measurement start TSF correctly Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 68/95] bpf, devmap: Fix premature entry free on destroying map Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 69/95] bpf, devmap: Add missing bulk queue free Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 70/95] bpf, devmap: Add missing RCU read lock on flush Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 71/95] bpf, x64: fix stack layout of JITed bpf code Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 72/95] qmi_wwan: add support for QMAP padding in the RX path Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 73/95] qmi_wwan: avoid RCU stalls on device disconnect when in QMAP mode Sasha Levin 2019-06-27 0:29 ` [PATCH AUTOSEL 5.1 74/95] qmi_wwan: extend permitted QMAP mux_id value range Sasha Levin 2019-06-27 0:30 ` [PATCH AUTOSEL 5.1 75/95] bpf: fix nested bpf tracepoints with per-cpu data Sasha Levin 2019-06-27 0:30 ` [PATCH AUTOSEL 5.1 84/95] bnx2x: Check if transceiver implements DDM before access Sasha Levin 2019-06-27 0:30 ` [PATCH AUTOSEL 5.1 86/95] ip6_tunnel: allow not to count pkts on tstats by passing dev as NULL Sasha Levin 2019-06-27 0:30 ` [PATCH AUTOSEL 5.1 87/95] net: lio_core: fix potential sign-extension overflow on large shift Sasha Levin 2019-06-27 0:30 ` [PATCH AUTOSEL 5.1 92/95] net: dsa: mv88e6xxx: fix shift of FID bits in mv88e6185_g1_vtu_loadpurge() Sasha Levin 2019-06-27 0:30 ` [PATCH AUTOSEL 5.1 95/95] net :sunrpc :clnt :Fix xps refcount imbalance on the error path Sasha Levin
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