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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: "Toke Høiland-Jørgensen" <toke@redhat.com>,
	"Daniel Borkmann" <daniel@iogearbox.net>,
	"Quentin Monnet" <quentin@isovalent.com>,
	"Sasha Levin" <sashal@kernel.org>,
	netdev@vger.kernel.org, bpf@vger.kernel.org
Subject: [PATCH AUTOSEL 5.4 114/459] bpftool: Don't crash on missing xlated program instructions
Date: Fri, 14 Feb 2020 10:56:04 -0500
Message-ID: <20200214160149.11681-114-sashal@kernel.org> (raw)
In-Reply-To: <20200214160149.11681-1-sashal@kernel.org>

From: Toke Høiland-Jørgensen <toke@redhat.com>

[ Upstream commit d95f1e8b462c4372ac409886070bb8719d8a4d3a ]

Turns out the xlated program instructions can also be missing if
kptr_restrict sysctl is set. This means that the previous fix to check the
jited_prog_insns pointer was insufficient; add another check of the
xlated_prog_insns pointer as well.

Fixes: 5b79bcdf0362 ("bpftool: Don't crash on missing jited insns or ksyms")
Fixes: cae73f233923 ("bpftool: use bpf_program__get_prog_info_linear() in prog.c:do_dump()")
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/20200206102906.112551-1-toke@redhat.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 tools/bpf/bpftool/prog.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index ea0bcd58bcb9a..2e388421c32f4 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -500,7 +500,7 @@ static int do_dump(int argc, char **argv)
 		buf = (unsigned char *)(info->jited_prog_insns);
 		member_len = info->jited_prog_len;
 	} else {	/* DUMP_XLATED */
-		if (info->xlated_prog_len == 0) {
+		if (info->xlated_prog_len == 0 || !info->xlated_prog_insns) {
 			p_err("error retrieving insn dump: kernel.kptr_restrict set?");
 			goto err_free;
 		}
-- 
2.20.1


       reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200214160149.11681-1-sashal@kernel.org>
2020-02-14 15:56 ` Sasha Levin [this message]
2020-02-14 15:56 ` [PATCH AUTOSEL 5.4 115/459] bpf, sockhash: Synchronize_rcu before free'ing map Sasha Levin
2020-02-14 15:56 ` [PATCH AUTOSEL 5.4 116/459] bpf, sockmap: Check update requirements after locking Sasha Levin
2020-02-14 15:56 ` [PATCH AUTOSEL 5.4 117/459] bpf: Improve bucket_log calculation logic Sasha Levin
2020-02-14 15:56 ` [PATCH AUTOSEL 5.4 118/459] bpf, sockmap: Don't sleep while holding RCU lock on tear-down Sasha Levin
2020-02-14 15:57 ` [PATCH AUTOSEL 5.4 186/459] samples/bpf: Set -fno-stack-protector when building BPF programs Sasha Levin
2020-02-14 15:57 ` [PATCH AUTOSEL 5.4 227/459] bpf: Print error message for bpftool cgroup show Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 248/459] tools lib api fs: Fix gcc9 stringop-truncation compilation error Sasha Levin
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 307/459] bpf: Return -EBADRQC for invalid map type in __bpf_tx_xdp_map Sasha Levin
2020-02-14 16:00 ` [PATCH AUTOSEL 5.4 376/459] bpf, btf: Always output invariant hit in pahole DWARF to BTF transform Sasha Levin
2020-02-14 16:00 ` [PATCH AUTOSEL 5.4 397/459] selftests: bpf: Reset global state between reuseport test runs Sasha Levin
2020-02-14 16:01 ` [PATCH AUTOSEL 5.4 415/459] bpf: map_seq_next should always increase position index Sasha Levin
2020-02-14 16:01 ` [PATCH AUTOSEL 5.4 430/459] powerpc: Do not consider weak unresolved symbol relocations as bad Sasha Levin
2020-02-14 16:01 ` [PATCH AUTOSEL 5.4 455/459] i40e: Relax i40e_xsk_wakeup's return value when PF is busy Sasha Levin

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