From: Vijay Anusuri <vanus...@mvista.com> Upstream-Status: Backport from https://github.com/linux-pam/linux-pam/commit/031bb5a5d0d950253b68138b498dc93be69a64cb
Signed-off-by: Vijay Anusuri <vanus...@mvista.com> --- .../pam/libpam/CVE-2024-22365.patch | 59 +++++++++++++++++++ meta/recipes-extended/pam/libpam_1.3.1.bb | 1 + 2 files changed, 60 insertions(+) create mode 100644 meta/recipes-extended/pam/libpam/CVE-2024-22365.patch diff --git a/meta/recipes-extended/pam/libpam/CVE-2024-22365.patch b/meta/recipes-extended/pam/libpam/CVE-2024-22365.patch new file mode 100644 index 0000000000..33ac37b7f0 --- /dev/null +++ b/meta/recipes-extended/pam/libpam/CVE-2024-22365.patch @@ -0,0 +1,59 @@ +From 031bb5a5d0d950253b68138b498dc93be69a64cb Mon Sep 17 00:00:00 2001 +From: Matthias Gerstner <matthias.gerst...@suse.de> +Date: Wed, 27 Dec 2023 14:01:59 +0100 +Subject: [PATCH] pam_namespace: protect_dir(): use O_DIRECTORY to prevent + local DoS situations + +Without O_DIRECTORY the path crawling logic is subject to e.g. FIFOs +being placed in user controlled directories, causing the PAM module to +block indefinitely during `openat()`. + +Pass O_DIRECTORY to cause the `openat()` to fail if the path does not +refer to a directory. + +With this the check whether the final path element is a directory +becomes unnecessary, drop it. + +Upstream-Status: Backport [https://github.com/linux-pam/linux-pam/commit/031bb5a5d0d950253b68138b498dc93be69a64cb] +CVE: CVE-2024-22365 +Signed-off-by: Vijay Anusuri <vanus...@mvista.com> +--- + modules/pam_namespace/pam_namespace.c | 18 +----------------- + 1 file changed, 1 insertion(+), 17 deletions(-) + +diff --git a/modules/pam_namespace/pam_namespace.c b/modules/pam_namespace/pam_namespace.c +index 2528cff86..f72d67189 100644 +--- a/modules/pam_namespace/pam_namespace.c ++++ b/modules/pam_namespace/pam_namespace.c +@@ -1201,7 +1201,7 @@ static int protect_dir(const char *path, mode_t mode, int do_mkdir, + int dfd = AT_FDCWD; + int dfd_next; + int save_errno; +- int flags = O_RDONLY; ++ int flags = O_RDONLY | O_DIRECTORY; + int rv = -1; + struct stat st; + +@@ -1255,22 +1255,6 @@ static int protect_dir(const char *path, mode_t mode, int do_mkdir, + rv = openat(dfd, dir, flags); + } + +- if (rv != -1) { +- if (fstat(rv, &st) != 0) { +- save_errno = errno; +- close(rv); +- rv = -1; +- errno = save_errno; +- goto error; +- } +- if (!S_ISDIR(st.st_mode)) { +- close(rv); +- errno = ENOTDIR; +- rv = -1; +- goto error; +- } +- } +- + if (flags & O_NOFOLLOW) { + /* we are inside user-owned dir - protect */ + if (protect_mount(rv, p, idata) == -1) { diff --git a/meta/recipes-extended/pam/libpam_1.3.1.bb b/meta/recipes-extended/pam/libpam_1.3.1.bb index bc72afe6ad..527a368e2d 100644 --- a/meta/recipes-extended/pam/libpam_1.3.1.bb +++ b/meta/recipes-extended/pam/libpam_1.3.1.bb @@ -24,6 +24,7 @@ SRC_URI = "https://github.com/linux-pam/linux-pam/releases/download/v${PV}/Linux file://pam-security-abstract-securetty-handling.patch \ file://pam-unix-nullok-secure.patch \ file://crypt_configure.patch \ + file://CVE-2024-22365.patch \ " SRC_URI[md5sum] = "558ff53b0fc0563ca97f79e911822165" -- 2.25.1
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