From: Hitendra Prajapati <hprajap...@mvista.com> Upstream-Status: Backport from https://github.com/linux-pam/linux-pam/commit/031bb5a5d0d950253b68138b498dc93be69a64cb
Signed-off-by: Hitendra Prajapati <hprajap...@mvista.com> Signed-off-by: Steve Sakoman <st...@sakoman.com> --- .../pam/libpam/CVE-2024-22365.patch | 62 +++++++++++++++++++ meta/recipes-extended/pam/libpam_1.5.2.bb | 1 + 2 files changed, 63 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..e9e3a078e0 --- /dev/null +++ b/meta/recipes-extended/pam/libpam/CVE-2024-22365.patch @@ -0,0 +1,62 @@ +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: Hitendra Prajapati <hprajap...@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 4d4188d..d6b1d3c 100644 +--- a/modules/pam_namespace/pam_namespace.c ++++ b/modules/pam_namespace/pam_namespace.c +@@ -1103,7 +1103,7 @@ 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; + +@@ -1157,22 +1157,6 @@ 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) { +-- +2.25.1 + diff --git a/meta/recipes-extended/pam/libpam_1.5.2.bb b/meta/recipes-extended/pam/libpam_1.5.2.bb index 0799102f8e..20745aa837 100644 --- a/meta/recipes-extended/pam/libpam_1.5.2.bb +++ b/meta/recipes-extended/pam/libpam_1.5.2.bb @@ -26,6 +26,7 @@ SRC_URI = "https://github.com/linux-pam/linux-pam/releases/download/v${PV}/Linux file://pam-volatiles.conf \ file://CVE-2022-28321-0002.patch \ file://0001-pam_motd-do-not-rely-on-all-filesystems-providing-a-.patch \ + file://CVE-2024-22365.patch \ " SRC_URI[sha256sum] = "e4ec7131a91da44512574268f493c6d8ca105c87091691b8e9b56ca685d4f94d" -- 2.34.1
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