From: Siddhesh Poyarekar <siddhesh@gotplt.org>
To: Florian Weimer <fweimer@redhat.com>, libc-alpha@sourceware.org
Subject: Re: [PATCH] gshadow: Matching sgetsgent, sgetsgent_r ERANGE handling (bug 30151)
Date: Wed, 1 Mar 2023 13:20:22 -0500 [thread overview]
Message-ID: <3e3a4797-501d-3df7-c69f-9a715f3f3e0c@gotplt.org> (raw)
In-Reply-To: <875ybvs98d.fsf@oldenburg.str.redhat.com>
On 2023-02-21 03:39, Florian Weimer via Libc-alpha wrote:
> Before this change, sgetsgent_r did not set errno to ERNAGE, but
s/ERNAGE/ERANGE/
> sgetsgent only checked errno, not the return value from sgetsgent_r.
> Consequently, sgetsgent did not detect any error, and reported
> success to the caller, without initializing the struct sgrp object
> whose address was returned.
>
> This commit changes sgetsgent_r to set errno as well. This avoids
> similar issues in applications which only change errno.
... which only *check* errno?
The patch itself is fine.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
>
> Tested on x86_64-linux-gnu.
>
> ---
> gshadow/Makefile | 2 +-
> gshadow/sgetsgent_r.c | 5 +++-
> gshadow/tst-sgetsgent.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 74 insertions(+), 2 deletions(-)
>
> diff --git a/gshadow/Makefile b/gshadow/Makefile
> index 796fbbf473..a95524593a 100644
> --- a/gshadow/Makefile
> +++ b/gshadow/Makefile
> @@ -26,7 +26,7 @@ headers = gshadow.h
> routines = getsgent getsgnam sgetsgent fgetsgent putsgent \
> getsgent_r getsgnam_r sgetsgent_r fgetsgent_r
>
> -tests = tst-gshadow tst-putsgent tst-fgetsgent_r
> +tests = tst-gshadow tst-putsgent tst-fgetsgent_r tst-sgetsgent
>
> CFLAGS-getsgent_r.c += -fexceptions
> CFLAGS-getsgent.c += -fexceptions
> diff --git a/gshadow/sgetsgent_r.c b/gshadow/sgetsgent_r.c
> index ea085e91d7..c75624e1f7 100644
> --- a/gshadow/sgetsgent_r.c
> +++ b/gshadow/sgetsgent_r.c
> @@ -61,7 +61,10 @@ __sgetsgent_r (const char *string, struct sgrp *resbuf, char *buffer,
> buffer[buflen - 1] = '\0';
> sp = strncpy (buffer, string, buflen);
> if (buffer[buflen - 1] != '\0')
> - return ERANGE;
> + {
> + __set_errno (ERANGE);
> + return ERANGE;
> + }
> }
> else
> sp = (char *) string;
> diff --git a/gshadow/tst-sgetsgent.c b/gshadow/tst-sgetsgent.c
> new file mode 100644
> index 0000000000..0370c10fd0
> --- /dev/null
> +++ b/gshadow/tst-sgetsgent.c
> @@ -0,0 +1,69 @@
> +/* Test large input for sgetsgent (bug 30151).
> + Copyright (C) 2023 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <gshadow.h>
> +#include <stddef.h>
> +#include <support/check.h>
> +#include <support/support.h>
> +#include <support/xmemstream.h>
> +#include <stdlib.h>
> +
> +static int
> +do_test (void)
> +{
> + /* Create a shadow group with 1000 members. */
> + struct xmemstream mem;
> + xopen_memstream (&mem);
> + const char *passwd = "k+zD0nucwfxAo3sw1NXUj6K5vt5M16+X0TVGdE1uFvq5R8V7efJ";
> + fprintf (mem.out, "group-name:%s::m0", passwd);
> + for (int i = 1; i < 1000; ++i)
> + fprintf (mem.out, ",m%d", i);
> + xfclose_memstream (&mem);
> +
> + /* Call sgetsgent. */
> + char *input = mem.buffer;
> + struct sgrp *e = sgetsgent (input);
> + TEST_VERIFY_EXIT (e != NULL);
> + TEST_COMPARE_STRING (e->sg_namp, "group-name");
> + TEST_COMPARE_STRING (e->sg_passwd, passwd);
> + /* No administrators. */
> + TEST_COMPARE_STRING (e->sg_adm[0], NULL);
> + /* Check the members list. */
> + for (int i = 0; i < 1000; ++i)
> + {
> + char *member = xasprintf ("m%d", i);
> + TEST_COMPARE_STRING (e->sg_mem[i], member);
> + free (member);
> + }
> + TEST_COMPARE_STRING (e->sg_mem[1000], NULL);
> +
> + /* Check that putsgent brings back the input string. */
> + xopen_memstream (&mem);
> + TEST_COMPARE (putsgent (e, mem.out), 0);
> + xfclose_memstream (&mem);
> + /* Compare without the trailing '\n' that putsgent added. */
> + TEST_COMPARE (mem.buffer[mem.length - 1], '\n');
> + mem.buffer[mem.length - 1] = '\0';
> + TEST_COMPARE_STRING (mem.buffer, input);
> +
> + free (mem.buffer);
> + free (input);
> + return 0;
> +}
> +
> +#include <support/test-driver.c>
>
> base-commit: 8b014a1b1f7aee1e3348db108aeea396359d481e
>
next prev parent reply other threads:[~2023-03-01 18:20 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-21 8:39 Florian Weimer
2023-02-21 9:21 ` Sam James
2023-02-21 9:45 ` Florian Weimer
2023-03-01 18:20 ` Siddhesh Poyarekar [this message]
2023-03-07 9:06 ` Florian Weimer
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