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 4.19 05/60] samples, bpf: suppress compiler warning
Date: Wed, 26 Jun 2019 20:35:20 -0400 [thread overview]
Message-ID: <20190627003616.20767-5-sashal@kernel.org> (raw)
In-Reply-To: <20190627003616.20767-1-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 8381d792f138..06957f0fbe83 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 other threads:[~2019-06-27 0:50 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190627003616.20767-1-sashal@kernel.org>
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 04/60] samples, bpf: fix to change the buffer size for read() Sasha Levin
2019-06-27 0:35 ` Sasha Levin [this message]
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 06/60] mac80211: fix rate reporting inside cfg80211_calculate_bitrate_he() Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 07/60] bpf: sockmap, fix use after free from sleep in psock backlog workqueue Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 11/60] mac80211: mesh: fix RCU warning Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 12/60] mac80211: free peer keys before vif down in mesh Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 13/60] mwifiex: Fix possible buffer overflows at parsing bss descriptor Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 14/60] mwifiex: Abort at too short BSS descriptor element Sasha Levin
2019-06-28 22:58 ` Brian Norris
2019-07-10 14:51 ` Sasha Levin
2019-07-10 21:12 ` Brian Norris
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 15/60] iwlwifi: Fix double-free problems in iwl_req_fw_callback() Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 16/60] mwifiex: Fix heap overflow in mwifiex_uap_parse_tail_ies() Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 17/60] bpf: udp: Avoid calling reuseport's bpf_prog from udp_gro Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 18/60] netfilter: ipv6: nf_defrag: fix leakage of unqueued fragments Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 20/60] netfilter: ipv6: nf_defrag: accept duplicate fragments again Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 21/60] dt-bindings: can: mcp251x: add mcp25625 support Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 22/60] can: mcp251x: add support for mcp25625 Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 23/60] can: m_can: implement errata "Needless activation of MRAF irq" Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 24/60] can: af_can: Fix error path of can_init() Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 25/60] net: phy: rename Asix Electronics PHY driver Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 26/60] ibmvnic: Do not close unopened driver during reset Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 27/60] ibmvnic: Refresh device multicast list after reset Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 28/60] ibmvnic: Fix unchecked return codes of memory allocations Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 31/60] bpf: lpm_trie: check left child of last leftmost node for NULL Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 37/60] mlxsw: spectrum: Disallow prio-tagged packets when PVID is removed Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 40/60] mac80211: only warn once on chanctx_conf being NULL Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 41/60] mac80211: do not start any work during reconfigure flow Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 42/60] bpf, devmap: Fix premature entry free on destroying map Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 43/60] bpf, devmap: Add missing bulk queue free Sasha Levin
2019-06-27 0:35 ` [PATCH AUTOSEL 4.19 44/60] bpf, devmap: Add missing RCU read lock on flush Sasha Levin
2019-06-27 0:36 ` [PATCH AUTOSEL 4.19 45/60] bpf, x64: fix stack layout of JITed bpf code Sasha Levin
2019-06-27 0:36 ` [PATCH AUTOSEL 4.19 46/60] qmi_wwan: add support for QMAP padding in the RX path Sasha Levin
2019-06-27 0:36 ` [PATCH AUTOSEL 4.19 47/60] qmi_wwan: avoid RCU stalls on device disconnect when in QMAP mode Sasha Levin
2019-06-27 0:36 ` [PATCH AUTOSEL 4.19 48/60] qmi_wwan: extend permitted QMAP mux_id value range Sasha Levin
2019-06-27 0:36 ` [PATCH AUTOSEL 4.19 49/60] bpf: fix nested bpf tracepoints with per-cpu data Sasha Levin
2019-06-27 0:36 ` [PATCH AUTOSEL 4.19 52/60] bnx2x: Check if transceiver implements DDM before access Sasha Levin
2019-06-27 0:36 ` [PATCH AUTOSEL 4.19 54/60] ip6_tunnel: allow not to count pkts on tstats by passing dev as NULL Sasha Levin
2019-06-27 0:36 ` [PATCH AUTOSEL 4.19 55/60] net: lio_core: fix potential sign-extension overflow on large shift Sasha Levin
2019-06-27 0:36 ` [PATCH AUTOSEL 4.19 58/60] net: dsa: mv88e6xxx: fix shift of FID bits in mv88e6185_g1_vtu_loadpurge() Sasha Levin
2019-06-27 0:36 ` [PATCH AUTOSEL 4.19 60/60] net :sunrpc :clnt :Fix xps refcount imbalance on the error path Sasha Levin
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