From: David Howells <dhowells@redhat.com>
Cc: dhowells@redhat.com, serge.hallyn@canonical.com,
eparis@redhat.com, linux-security-module@vger.kernel.org,
selinux@tycho.nsa.gov
Subject: Re: [PATCH 0/9] Open loaders and interpreters with new creds during exec
Date: Thu, 21 Apr 2011 19:53:06 +0100 [thread overview]
Message-ID: <32148.1303411986@redhat.com> (raw)
In-Reply-To: <20110421143020.31318.59457.stgit@warthog.procyon.org.uk>
David Howells <dhowells@redhat.com> wrote:
> (1) Consider a SUID binary. If the loader for that binary is executable by
> the uid to which the binary changes its uid on execution, but not by the
> uid of the caller, should execution succeed?
>
> For example, if, as root, I do this:
>
> cp -v /bin/ls /tmp/ls
> perl -p -i -e s/ld-linux/ld-linuQ/ /tmp/ls
> cp -v /lib64/ld-linux-x86-64.so.2 /lib64/ld-linuQ-x86-64.so.2
> chmod -v 0700 /lib64/ld-linuQ-x86-64.so.2
I forgot to add to that:
chmod u+s /tmp/ls
David
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next prev parent reply other threads:[~2011-04-21 18:53 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-21 14:30 [PATCH 0/9] Open loaders and interpreters with new creds during exec David Howells
2011-04-21 14:30 ` [PATCH 1/9] TOMOYO: Fix tomoyo_dentry_open() to use the right creds David Howells
2011-04-21 14:30 ` [PATCH 2/9] TOMOYO: Derive the new domain for an exec'd process in tomoyo_bprm_set_creds() David Howells
2011-04-21 14:30 ` [PATCH 3/9] LSM: Permit commit_creds() to take a const pointer David Howells
2011-04-21 14:30 ` [PATCH 4/9] LSM: Make the linux_binfmt creds pointer const and pass creds to bprm_set_creds David Howells
2011-04-21 14:30 ` [PATCH 5/9] LSM: Install the new credentials earlier in the exec procedure David Howells
2011-04-21 14:31 ` [PATCH 6/9] LSM: Pass linux_binprm pointer to kernel_read() so creds are available David Howells
2011-04-21 14:31 ` [PATCH 7/9] LSM: Allow an LSM to indicate that it wants bprm->file reopening with new creds David Howells
2011-04-21 14:31 ` [PATCH 8/9] LSM: Pass linux_binprm pointer to open_exec() so creds are available David Howells
[not found] ` <201104220225.p3M2PjJR020777@www262.sakura.ne.jp>
2011-04-28 15:27 ` David Howells
2011-04-21 14:31 ` [PATCH 9/9] LSM: Use derived creds for accessing an executable's interpreter and binary loader David Howells
2011-04-21 16:12 ` [PATCH 0/9] Open loaders and interpreters with new creds during exec Stephen Smalley
2011-04-21 16:30 ` Daniel J Walsh
2011-04-21 17:32 ` Casey Schaufler
2011-04-21 18:13 ` David Howells
2011-04-21 18:53 ` David Howells [this message]
[not found] ` <20110428200218.GB9186@hallyn.com>
2011-04-30 10:48 ` David Howells
2011-05-02 13:28 ` Stephen Smalley
2011-05-04 12:12 ` David Howells
2011-05-04 13:15 ` David Howells
[not found] ` <20110504144558.GC917@mail.hallyn.com>
2011-05-04 16:27 ` David Howells
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