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Thu, 29 Aug 2024 18:26:06 -0700 (PDT) Received: from [192.168.0.235] ([38.34.87.7]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20515537704sm17255185ad.125.2024.08.29.18.26.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Aug 2024 18:26:05 -0700 (PDT) Message-ID: <3a48e38f29cc8c73e36a6d3339b9303571d522a8.camel@gmail.com> Subject: Re: [PATCH bpf] bpf: add check for invalid name in btf_name_valid_section() From: Eduard Zingerman To: Jeongjun Park , alexei.starovoitov@gmail.com Cc: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, haoluo@google.com, john.fastabend@gmail.com, jolsa@kernel.org, kpsingh@kernel.org, linux-kernel@vger.kernel.org, martin.lau@linux.dev, sdf@fomichev.me, song@kernel.org, yonghong.song@linux.dev Date: Thu, 29 Aug 2024 18:26:00 -0700 In-Reply-To: References: <20240829034552.262214-1-aha310510@gmail.com> Content-Type: multipart/mixed; boundary="=-niWrXF/chqXzzhgAUdlz" User-Agent: Evolution 3.52.4 (3.52.4-1.fc40) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 --=-niWrXF/chqXzzhgAUdlz Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2024-08-28 at 22:45 -0700, Eduard Zingerman wrote: [...] > I will prepare a test case. > Probably tomorrow. Please find test in the attachment. This test triggers KASAN error report as in another attachment. (I enabled CONFIG_KASAN using menuconfig on top of regular selftest config). On Fri, Aug 23, 2024 at 3:43=E2=80=AFAM Jeongjun Park = wrote: [...] > diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c > index 520f49f422fe..5c24ea1a65a4 100644 > --- a/kernel/bpf/btf.c > +++ b/kernel/bpf/btf.c > @@ -823,6 +823,9 @@ static bool btf_name_valid_section(const struct btf *= btf, u32 offset) > const char *src =3D btf_str_by_offset(btf, offset); > const char *src_limit; >=20 > + if (!*src) > + return false; > + I think that correct fix would be as follows: --- diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index edad152cee8e..d583d76fcace 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -820,7 +820,6 @@ static bool btf_name_valid_section(const struct btf *bt= f, u32 offset) =20 /* set a limit on identifier length */ src_limit =3D src + KSYM_NAME_LEN; - src++; while (*src && src < src_limit) { if (!isprint(*src)) return false; --=-niWrXF/chqXzzhgAUdlz Content-Disposition: attachment; filename="bad-name-test.patch" Content-Type: text/x-patch; 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