The quilt patch titled Subject: memfd: check for non-NULL file_seals in memfd_create() syscall has been removed from the -mm tree. Its filename was memfd-check-for-non-null-file_seals-in-memfd_create-syscall.patch
This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------ From: Roberto Sassu roberto.sassu@huawei.com Subject: memfd: check for non-NULL file_seals in memfd_create() syscall Date: Wed, 7 Jun 2023 15:24:27 +0200
Ensure that file_seals is non-NULL before using it in the memfd_create() syscall. One situation in which memfd_file_seals_ptr() could return a NULL pointer when CONFIG_SHMEM=n, oopsing the kernel.
Link: https://lkml.kernel.org/r/20230607132427.2867435-1-roberto.sassu@huaweicloud... Fixes: 47b9012ecdc7 ("shmem: add sealing support to hugetlb-backed memfd") Signed-off-by: Roberto Sassu roberto.sassu@huawei.com Cc: Marc-Andr Lureau marcandre.lureau@redhat.com Cc: Mike Kravetz mike.kravetz@oracle.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
mm/memfd.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
--- a/mm/memfd.c~memfd-check-for-non-null-file_seals-in-memfd_create-syscall +++ a/mm/memfd.c @@ -371,12 +371,15 @@ SYSCALL_DEFINE2(memfd_create,
inode->i_mode &= ~0111; file_seals = memfd_file_seals_ptr(file); - *file_seals &= ~F_SEAL_SEAL; - *file_seals |= F_SEAL_EXEC; + if (file_seals) { + *file_seals &= ~F_SEAL_SEAL; + *file_seals |= F_SEAL_EXEC; + } } else if (flags & MFD_ALLOW_SEALING) { /* MFD_EXEC and MFD_ALLOW_SEALING are set */ file_seals = memfd_file_seals_ptr(file); - *file_seals &= ~F_SEAL_SEAL; + if (file_seals) + *file_seals &= ~F_SEAL_SEAL; }
fd_install(fd, file); _
Patches currently in -mm which might be from roberto.sassu@huawei.com are
shmem-use-ramfs_kill_sb-for-kill_sb-method-of-ramfs-based-tmpfs.patch