public inbox for libc-alpha@sourceware.org
 help / color / mirror / Atom feed
From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: libc-alpha@sourceware.org, Siddhesh Poyarekar <siddhesh@sourceware.org>
Cc: Florian Weimer <fweimer@redhat.com>
Subject: [PATCH v3 02/19] elf: Add GLIBC_TUNABLES to unsecvars
Date: Mon,  6 Nov 2023 17:25:35 -0300	[thread overview]
Message-ID: <20231106202552.3404059-3-adhemerval.zanella@linaro.org> (raw)
In-Reply-To: <20231106202552.3404059-1-adhemerval.zanella@linaro.org>

setuid/setgid process now ignores any glibc tunables, and filters out
all environment variables that might changes its behavior. This patch
also adds GLIBC_TUNABLES, so any spawned process by setuid/setgid
processes should set tunable explicitly.

Checked on x86_64-linux-gnu.

Reviewed-by: Florian Weimer <fweimer@redhat.com>
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
---
 elf/tst-env-setuid-tunables.c | 32 ++++----------------------------
 sysdeps/generic/unsecvars.h   |  1 +
 2 files changed, 5 insertions(+), 28 deletions(-)

diff --git a/elf/tst-env-setuid-tunables.c b/elf/tst-env-setuid-tunables.c
index f0b92c97e7..2603007b7b 100644
--- a/elf/tst-env-setuid-tunables.c
+++ b/elf/tst-env-setuid-tunables.c
@@ -60,45 +60,21 @@ const char *teststrings[] =
   "glibc.not_valid.check=2",
 };
 
-const char *resultstrings[] =
-{
-  "glibc.malloc.mmap_threshold=4096",
-  "glibc.malloc.mmap_threshold=4096",
-  "glibc.malloc.mmap_threshold=4096",
-  "glibc.malloc.perturb=0x800",
-  "glibc.malloc.perturb=0x800:glibc.malloc.mmap_threshold=4096",
-  "glibc.malloc.perturb=0x800:glibc.malloc.mmap_threshold=4096",
-  "glibc.malloc.mmap_threshold=4096",
-  "glibc.malloc.mmap_threshold=4096",
-  "glibc.malloc.mmap_threshold=glibc.malloc.mmap_threshold=4096",
-  "",
-  "",
-  "",
-  "",
-  "",
-  "",
-  "",
-};
-
 static int
 test_child (int off)
 {
   const char *val = getenv ("GLIBC_TUNABLES");
+  int ret = 1;
 
   printf ("    [%d] GLIBC_TUNABLES is %s\n", off, val);
   fflush (stdout);
-  if (val != NULL && strcmp (val, resultstrings[off]) == 0)
-    return 0;
-
   if (val != NULL)
-    printf ("    [%d] Unexpected GLIBC_TUNABLES VALUE %s, expected %s\n",
-	    off, val, resultstrings[off]);
+    printf ("    [%d] Unexpected GLIBC_TUNABLES VALUE %s\n", off, val);
   else
-    printf ("    [%d] GLIBC_TUNABLES environment variable absent\n", off);
-
+    ret = 0;
   fflush (stdout);
 
-  return 1;
+  return ret;
 }
 
 static int
diff --git a/sysdeps/generic/unsecvars.h b/sysdeps/generic/unsecvars.h
index 8278c50a84..81397fb90b 100644
--- a/sysdeps/generic/unsecvars.h
+++ b/sysdeps/generic/unsecvars.h
@@ -4,6 +4,7 @@
 #define UNSECURE_ENVVARS \
   "GCONV_PATH\0"							      \
   "GETCONF_DIR\0"							      \
+  "GLIBC_TUNABLES\0"							      \
   "HOSTALIASES\0"							      \
   "LD_AUDIT\0"								      \
   "LD_DEBUG\0"								      \
-- 
2.34.1


  parent reply	other threads:[~2023-11-06 20:26 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-11-06 20:25 [PATCH v3 00/19] Improve loader environment variable handling Adhemerval Zanella
2023-11-06 20:25 ` [PATCH v3 01/19] elf: Remove /etc/suid-debug support Adhemerval Zanella
2023-11-06 20:25 ` Adhemerval Zanella [this message]
2023-11-06 20:25 ` [PATCH v3 03/19] elf: Ignore GLIBC_TUNABLES for setuid/setgid binaries Adhemerval Zanella
2023-11-06 20:25 ` [PATCH v3 04/19] elf: Add all malloc tunable to unsecvars Adhemerval Zanella
2023-11-06 20:25 ` [PATCH v3 05/19] elf: Do not process invalid tunable format Adhemerval Zanella
2023-11-06 20:25 ` [PATCH v3 06/19] elf: Do not parse ill-formatted strings Adhemerval Zanella
2023-11-20 21:48   ` Siddhesh Poyarekar
2023-11-06 20:25 ` [PATCH v3 07/19] elf: Fix _dl_debug_vdprintf to work before self-relocation Adhemerval Zanella
2023-11-06 20:25 ` [PATCH v3 08/19] elf: Emit warning if tunable is ill-formatted Adhemerval Zanella
2023-11-20 21:50   ` Siddhesh Poyarekar
2023-11-06 20:25 ` [PATCH v3 09/19] x86: Use dl-symbol-redir-ifunc.h on cpu-tunables Adhemerval Zanella
2023-11-06 20:25 ` [PATCH v3 10/19] s390: " Adhemerval Zanella
2023-11-06 20:25 ` [PATCH v3 11/19] elf: Do not duplicate the GLIBC_TUNABLES string Adhemerval Zanella
2023-11-20 22:44   ` Siddhesh Poyarekar
2023-11-21 18:12     ` Adhemerval Zanella Netto
2023-11-22 11:39       ` Adhemerval Zanella Netto
2023-11-22 12:23       ` Siddhesh Poyarekar
2023-11-22 13:03         ` Adhemerval Zanella Netto
2023-11-22 13:24           ` Siddhesh Poyarekar
2023-11-22 14:13             ` Adhemerval Zanella Netto
2023-11-06 20:25 ` [PATCH v3 12/19] elf: Ignore LD_PROFILE for setuid binaries Adhemerval Zanella
2023-11-20 22:47   ` Siddhesh Poyarekar
2023-11-06 20:25 ` [PATCH v3 13/19] elf: Remove LD_PROFILE for static binaries Adhemerval Zanella
2023-11-20 22:55   ` Siddhesh Poyarekar
2023-11-06 20:25 ` [PATCH v3 14/19] elf: Ignore loader debug env vars for setuid Adhemerval Zanella
2023-11-20 22:57   ` Siddhesh Poyarekar
2023-11-21 18:24     ` Adhemerval Zanella Netto
2023-11-06 20:25 ` [PATCH v3 15/19] elf: Remove any_debug from dl_main_state Adhemerval Zanella
2023-11-20 22:58   ` Siddhesh Poyarekar
2023-11-06 20:25 ` [PATCH v3 16/19] elf: Ignore LD_LIBRARY_PATH and debug env var for setuid for static Adhemerval Zanella
2023-11-20 22:59   ` Siddhesh Poyarekar
2023-11-06 20:25 ` [PATCH v3 17/19] elf: Add comments on how LD_AUDIT and LD_PRELOAD handle __libc_enable_secure Adhemerval Zanella
2023-11-06 20:25 ` [PATCH v3 18/19] elf: Ignore LD_BIND_NOW and LD_BIND_NOT for setuid binaries Adhemerval Zanella
2023-11-20 23:02   ` Siddhesh Poyarekar
2023-11-06 20:25 ` [PATCH v3 19/19] elf: Refactor process_envvars Adhemerval Zanella
2023-11-20 23:09   ` Siddhesh Poyarekar
2023-11-21 19:00     ` Adhemerval Zanella Netto
2023-11-20 23:12 ` [PATCH v3 00/19] Improve loader environment variable handling Siddhesh Poyarekar
2023-11-21 19:37   ` Adhemerval Zanella Netto

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20231106202552.3404059-3-adhemerval.zanella@linaro.org \
    --to=adhemerval.zanella@linaro.org \
    --cc=fweimer@redhat.com \
    --cc=libc-alpha@sourceware.org \
    --cc=siddhesh@sourceware.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).