From: "Christian Göttsche" <cgzones@googlemail.com>
To: selinux@vger.kernel.org
Subject: [PATCH 2/3] libselinux: always set errno on context translation failure
Date: Mon, 11 Dec 2023 16:00:30 +0100 [thread overview]
Message-ID: <20231211150031.127850-2-cgzones@googlemail.com> (raw)
In-Reply-To: <20231211150031.127850-1-cgzones@googlemail.com>
Allow callers to expect errno is set on failure, e.g. other exported
libselinux functions like setexecfilecon(3).
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
---
libselinux/src/setrans_client.c | 22 +++++++++++++++++++---
1 file changed, 19 insertions(+), 3 deletions(-)
diff --git a/libselinux/src/setrans_client.c b/libselinux/src/setrans_client.c
index 920f9032..d7dbc0ca 100644
--- a/libselinux/src/setrans_client.c
+++ b/libselinux/src/setrans_client.c
@@ -92,8 +92,10 @@ send_request(int fd, uint32_t function, const char *data1, const char *data2)
ssize_t count, expected;
unsigned int i;
- if (fd < 0)
+ if (fd < 0) {
+ errno = EINVAL;
return -1;
+ }
if (!data1)
data1 = "";
@@ -123,8 +125,12 @@ send_request(int fd, uint32_t function, const char *data1, const char *data2)
while (((count = sendmsg(fd, &msgh, MSG_NOSIGNAL)) < 0)
&& (errno == EINTR)) ;
- if (count < 0 || count != expected)
+ if (count < 0)
+ return -1;
+ if (count != expected) {
+ errno = EBADMSG;
return -1;
+ }
return 0;
}
@@ -140,8 +146,10 @@ receive_response(int fd, uint32_t function, char **outdata, int32_t * ret_val)
struct iovec resp_data;
ssize_t count;
- if (fd < 0)
+ if (fd < 0) {
+ errno = EINVAL;
return -1;
+ }
resp_hdr[0].iov_base = &func;
resp_hdr[0].iov_len = sizeof(func);
@@ -151,11 +159,17 @@ receive_response(int fd, uint32_t function, char **outdata, int32_t * ret_val)
resp_hdr[2].iov_len = sizeof(*ret_val);
while (((count = readv(fd, resp_hdr, 3)) < 0) && (errno == EINTR)) ;
+ if (count < 0) {
+ return -1;
+ }
+
if (count != (sizeof(func) + sizeof(data_size) + sizeof(*ret_val))) {
+ errno = EBADMSG;
return -1;
}
if (func != function || !data_size || data_size > MAX_DATA_BUF) {
+ errno = EBADMSG;
return -1;
}
@@ -172,6 +186,8 @@ receive_response(int fd, uint32_t function, char **outdata, int32_t * ret_val)
if (count < 0 || (uint32_t) count != data_size ||
data[data_size - 1] != '\0') {
free(data);
+ if (count >= 0)
+ errno = EBADMSG;
return -1;
}
*outdata = data;
--
2.43.0
next prev parent reply other threads:[~2023-12-11 15:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-11 15:00 [PATCH 1/3] libselinux: update const qualifier of parameters in man pages Christian Göttsche
2023-12-11 15:00 ` Christian Göttsche [this message]
2023-12-11 15:00 ` [PATCH 3/3] libselinux: state setexecfilecon(3) sets errno on failure Christian Göttsche
2023-12-12 14:24 ` [PATCH 1/3] libselinux: update const qualifier of parameters in man pages James Carter
2023-12-12 16:45 ` James Carter
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