diff options
Diffstat (limited to 'userns-Check-euid-no-fsuid-when-establishing-an-unpr.patch')
| -rw-r--r-- | userns-Check-euid-no-fsuid-when-establishing-an-unpr.patch | 39 |
1 files changed, 0 insertions, 39 deletions
diff --git a/userns-Check-euid-no-fsuid-when-establishing-an-unpr.patch b/userns-Check-euid-no-fsuid-when-establishing-an-unpr.patch deleted file mode 100644 index 50830c30e..000000000 --- a/userns-Check-euid-no-fsuid-when-establishing-an-unpr.patch +++ /dev/null @@ -1,39 +0,0 @@ -From: "Eric W. Biederman" <ebiederm@xmission.com> -Date: Fri, 5 Dec 2014 18:26:30 -0600 -Subject: [PATCH] userns: Check euid no fsuid when establishing an unprivileged - uid mapping - -setresuid allows the euid to be set to any of uid, euid, suid, and -fsuid. Therefor it is safe to allow an unprivileged user to map -their euid and use CAP_SETUID privileged with exactly that uid, -as no new credentials can be obtained. - -I can not find a combination of existing system calls that allows setting -uid, euid, suid, and fsuid from the fsuid making the previous use -of fsuid for allowing unprivileged mappings a bug. - -This is part of a fix for CVE-2014-8989. - -Cc: stable@vger.kernel.org -Reviewed-by: Andy Lutomirski <luto@amacapital.net> -Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> ---- - kernel/user_namespace.c | 2 +- - 1 file changed, 1 insertion(+), 1 deletion(-) - -diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c -index 1ce6d67c07b7..9451b12a9b6c 100644 ---- a/kernel/user_namespace.c -+++ b/kernel/user_namespace.c -@@ -819,7 +819,7 @@ static bool new_idmap_permitted(const struct file *file, - u32 id = new_map->extent[0].lower_first; - if (cap_setid == CAP_SETUID) { - kuid_t uid = make_kuid(ns->parent, id); -- if (uid_eq(uid, file->f_cred->fsuid)) -+ if (uid_eq(uid, file->f_cred->euid)) - return true; - } - } --- -2.1.0 - |