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Kees Cook 7435fa1c53 binfmt_elf: Leave a gap between .bss and brk 
[ Upstream commit 2a5eb9995528441447d33838727f6ec1caf08139 ]

Currently the brk starts its randomization immediately after .bss,
which means there is a chance that when the random offset is 0, linear
overflows from .bss can reach into the brk area. Leave at least a single
page gap between .bss and brk (when it has not already been explicitly
relocated into the mmap range).

Reported-by: <y0un9n132@gmail.com>
Closes: https://lore.kernel.org/linux-hardening/CA+2EKTVLvc8hDZc+2Yhwmus=dzOUG5E4gV7ayCbu0MPJTZzWkw@mail.gmail.com/
Link: https://lore.kernel.org/r/20240217062545.1631668-2-keescook@chromium.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Stable-dep-of: 11854fe263eb ("binfmt_elf: Move brk for static PIE even if ASLR disabled")
Signed-off-by: Sasha Levin <sashal@kernel.org>
2025-05-22 14:12:11 +02:00
..
9p
fs/9p: fix uninitialized values during inode evict
2024-11-22 15:38:37 +01:00
adfs
Merge tag 'for-6.6/block-2023-08-28' of git://git.kernel.dk/linux
2023-08-29 20:21:42 -07:00
affs
affs: don't write overlarge OFS data block size fields
2025-04-10 14:37:37 +02:00
afs
afs: Fix the server_list to unuse a displaced server rather than putting it
2025-03-07 16:45:38 +01:00
autofs
Merge tag 'v6.6-vfs.autofs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2023-08-28 11:39:14 -07:00
befs
Merge tag 'for-6.6/block-2023-08-28' of git://git.kernel.dk/linux
2023-08-29 20:21:42 -07:00
bfs
Merge tag 'for-6.6/block-2023-08-28' of git://git.kernel.dk/linux
2023-08-29 20:21:42 -07:00
btrfs
btrfs: fix COW handling in run_delalloc_nocow()
2025-05-09 09:43:49 +02:00
cachefiles
cachefiles: Fix NULL pointer dereference in object->file
2025-02-17 09:40:42 +01:00
ceph
ceph: Fix incorrect flush end position calculation
2025-05-02 07:50:42 +02:00
coda
Merge tag 'v6.6-vfs.ctime' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2023-08-28 09:31:32 -07:00
configfs
configfs: convert to ctime accessor functions
2023-07-13 10:28:05 +02:00
cramfs
fs: Convert to bdev_open_by_dev()
2024-08-19 06:04:25 +02:00
crypto
fs: Create a generic is_dot_dotdot() utility
2024-10-04 16:29:48 +02:00
debugfs
debugfs: fix automount d_fsdata usage
2024-01-20 11:51:37 +01:00
devpts
Merge tag 'v6.6-vfs.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2023-08-28 10:17:14 -07:00
dlm
dlm: fix srcu_read_lock() return type to int
2025-02-08 09:51:41 +01:00
ecryptfs
fs: Create a generic is_dot_dotdot() utility
2024-10-04 16:29:48 +02:00
efivarfs
efivarfs: Fix error on non-existent file
2024-12-27 13:58:50 +01:00
efs
Merge tag 'for-6.6/block-2023-08-28' of git://git.kernel.dk/linux
2023-08-29 20:21:42 -07:00
erofs
erofs: fix PSI memstall accounting
2025-01-17 13:36:11 +01:00
exfat
exfat: fix the infinite loop in exfat_find_last_cluster()
2025-04-10 14:37:35 +02:00
exportfs
exportfs: remove kernel-doc warnings in exportfs
2023-08-29 17:45:22 -04:00
ext2
ext2: Verify bitmap and itable block numbers before using them
2024-08-03 08:54:15 +02:00
ext4
ext4: goto right label 'out_mmap_sem' in ext4_setattr()
2025-05-02 07:51:03 +02:00
f2fs
f2fs: fix to avoid atomicity corruption of atomic file
2025-04-25 10:45:27 +02:00
fat
fat: fix uninitialized variable
2024-10-22 15:46:20 +02:00
freevxfs
Merge tag 'for-6.6/block-2023-08-28' of git://git.kernel.dk/linux
2023-08-29 20:21:42 -07:00
fscache
netfs/fscache: Add a memory barrier for FSCACHE_VOLUME_CREATING
2024-12-09 10:31:45 +01:00
fuse
virtiofs: add filesystem context source name check
2025-04-25 10:45:50 +02:00
gfs2
gfs2: Truncate address space when flipping GFS2_DIF_JDATA flag
2025-02-01 18:37:52 +01:00
hfs
hfs/hfsplus: fix slab-out-of-bounds in hfs_bnode_read_key
2025-04-25 10:45:47 +02:00
hfsplus
hfs/hfsplus: fix slab-out-of-bounds in hfs_bnode_read_key
2025-04-25 10:45:47 +02:00
hostfs
um: hostfs: avoid issues on inode number reuse by host
2025-04-10 14:37:34 +02:00
hpfs
Merge tag 'for-6.6/block-2023-08-28' of git://git.kernel.dk/linux
2023-08-29 20:21:42 -07:00
hugetlbfs
mm: hugetlb pages should not be reserved by shmat() if SHM_NORESERVE
2024-02-23 09:25:16 +01:00
iomap
iomap: skip unnecessary ifs_block_is_uptodate check
2025-05-02 07:51:01 +02:00
isofs
isofs: Prevent the use of too small fid
2025-04-25 10:45:48 +02:00
jbd2
jbd2: remove wrong sb->s_sequence check
2025-04-25 10:45:28 +02:00
jffs2
jffs2: Fix rtime decompressor
2024-12-14 20:00:21 +01:00
jfs
jfs: add sanity check for agwidth in dbMount
2025-04-25 10:45:15 +02:00
kernfs
kernfs: fix false-positive WARN(nr_mmapped) in kernfs_drain_open_files
2024-08-29 17:33:33 +02:00
lockd
nfsd: stop setting ->pg_stats for unused stats
2024-08-19 06:04:23 +02:00
minix
Merge tag 'for-6.6/block-2023-08-28' of git://git.kernel.dk/linux
2023-08-29 20:21:42 -07:00
netfs
netfs: Only call folio_start_fscache() one time for each folio
2023-09-18 12:03:46 -07:00
nfs
nfs: add missing selections of CONFIG_CRC32
2025-04-25 10:45:46 +02:00
nfs_common
…
nfsd
nfsd: decrease sc_count directly if fail to queue dl_recall
2025-04-25 10:45:46 +02:00
nilfs2
nilfs2: handle errors that nilfs_prepare_chunk() may return
2025-02-27 04:10:54 -08:00
nls
nls: Hide new NLS_UCS2_UTILS
2023-08-31 12:07:34 -05:00
notify
fs: relax assertions on failure to encode file handles
2025-01-23 17:21:19 +01:00
ntfs
Merge tag 'for-6.6/block-2023-08-28' of git://git.kernel.dk/linux
2023-08-29 20:21:42 -07:00
ntfs3
fs/ntfs3: Fix WARNING in ntfs_extend_initialized_size
2025-05-02 07:50:54 +02:00
ocfs2
ocfs2: stop quota recovery before disabling quotas
2025-05-18 08:24:08 +02:00
omfs
Merge tag 'for-6.6/block-2023-08-28' of git://git.kernel.dk/linux
2023-08-29 20:21:42 -07:00
openpromfs
openpromfs: finish conversion to the new mount API
2024-06-12 11:11:30 +02:00
orangefs
orangefs: fix a oob in orangefs_debug_write
2025-02-21 13:57:12 +01:00
overlayfs
ovl: don't allow datadir only
2025-04-25 10:45:48 +02:00
proc
fs/procfs: fix the comment above proc_pid_wchan()
2025-04-10 14:37:35 +02:00
pstore
pstore/blk: trivial typo fixes
2025-02-08 09:51:42 +01:00
qnx4
Merge tag 'for-6.6/block-2023-08-28' of git://git.kernel.dk/linux
2023-08-29 20:21:42 -07:00
qnx6
Merge tag 'for-6.6/block-2023-08-28' of git://git.kernel.dk/linux
2023-08-29 20:21:42 -07:00
quota
quota: flush quota_release_work upon quota writeback
2024-12-09 10:33:01 +01:00
ramfs
ramfs: convert to ctime accessor functions
2023-07-24 10:30:04 +02:00
reiserfs
reiserfs: fix uninit-value in comp_keys
2024-08-19 06:04:26 +02:00
romfs
fs: Convert to bdev_open_by_dev()
2024-08-19 06:04:25 +02:00
smb
smb: client: Avoid race in open_cached_dir with lease breaks
2025-05-18 08:24:08 +02:00
squashfs
Squashfs: sanity check symbolic link size
2024-09-12 11:11:39 +02:00
sysfs
fs: sysfs: Fix reference leak in sysfs_break_active_protection()
2024-04-27 17:11:41 +02:00
sysv
sysv: don't call sb_bread() with pointers_lock held
2024-04-13 13:07:34 +02:00
tracefs
eventfs: Use list_del_rcu() for SRCU protected list variable
2024-09-12 11:11:27 +02:00
ubifs
ubifs: skip dumping tnc tree when zroot is null
2025-02-08 09:52:28 +01:00
udf
udf: Fix inode_getblk() return value
2025-04-25 10:45:27 +02:00
ufs
Merge tag 'for-6.6/block-2023-08-28' of git://git.kernel.dk/linux
2023-08-29 20:21:42 -07:00
unicode
Revert "unicode: Don't special case ignorable code points"
2024-12-14 20:00:20 +01:00
vboxsf
vboxsf: fix building with GCC 15
2025-03-22 12:50:41 -07:00
verity
fsverity: use register_sysctl_init() to avoid kmemleak warning
2024-06-16 13:47:33 +02:00
xfs
xfs: don't over-report free space or inodes in statvfs
2025-02-27 04:10:44 -08:00
zonefs
zonefs: Improve error handling
2024-02-23 09:25:13 +01:00
aio.c
fs/aio: Check IOCB_AIO_RW before the struct aio_kiocb conversion
2024-04-03 15:28:44 +02:00
anon_inodes.c
…
attr.c
Merge tag 'v6.6-vfs.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
2023-08-28 10:17:14 -07:00
bad_inode.c
fs: drop the timespec64 argument from update_time
2023-08-11 09:04:57 +02:00
binfmt_elf_fdpic.c
fs: binfmt_elf_efpic: don't use missing interpreter's properties
2024-08-29 17:33:33 +02:00
binfmt_elf_test.c
…
binfmt_elf.c
binfmt_elf: Leave a gap between .bss and brk
2025-05-22 14:12:11 +02:00
binfmt_flat.c
binfmt_flat: Fix integer overflow bug on 32 bit systems
2025-02-17 09:40:16 +01:00
binfmt_misc.c
binfmt_misc: cleanup on filesystem umount
2024-08-29 17:33:27 +02:00
binfmt_script.c
…
buffer.c
buffer: make folio_create_empty_buffers() return a buffer_head
2025-02-08 09:52:26 +01:00
char_dev.c
…
compat_binfmt_elf.c
…
coredump.c
…
d_path.c
…
dax.c
fsdax: dax_unshare_iter needs to copy entire blocks
2024-11-08 16:28:19 +01:00
dcache.c
fs: better handle deep ancestor chains in is_subdir()
2024-07-25 09:50:54 +02:00
direct-io.c
Merge tag 'mm-stable-2023-06-24-19-15' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2023-06-28 10:28:11 -07:00
drop_caches.c
fs: drop_caches: draining pages before dropping caches
2023-08-18 10:12:11 -07:00
eventfd.c
eventfd: prevent underflow for eventfd semaphores
2023-07-11 11:41:34 +02:00
eventpoll.c
epoll: Add synchronous wakeup support for ep_poll_callback
2024-12-27 13:58:57 +01:00
exec.c
exec: fix the racy usage of fs_struct->in_exec
2025-04-10 14:37:44 +02:00
fcntl.c
fs: Fix file_set_fowner LSM hook inconsistencies
2024-10-04 16:29:56 +02:00
fhandle.c
fs: Annotate struct file_handle with __counted_by() and use struct_size()
2024-08-19 06:04:28 +02:00
file_table.c
fs: fix proc_handler for sysctl_nr_open
2025-02-08 09:51:42 +01:00
file.c
fs: consistently deref the files table with rcu_dereference_raw()
2025-04-25 10:45:10 +02:00
filesystems.c
…
fs_context.c
fs: factor out vfs_parse_monolithic_sep() helper
2023-10-12 18:53:36 +03:00
fs_parser.c
…
fs_pin.c
…
fs_struct.c
kill do_each_thread()
2023-08-21 13:46:25 -07:00
fs_types.c
…
fs-writeback.c
fs/writeback: bail out if there is no more inodes for IO and queued once
2024-06-27 13:49:00 +02:00
fsopen.c
fs: add FSCONFIG_CMD_CREATE_EXCL
2023-08-14 18:48:02 +02:00
init.c
…
inode.c
fs/inode: Prevent dump_mapping() accessing invalid dentry.d_name.name
2024-12-09 10:31:41 +01:00
internal.h
Merge tag 'for-6.6/block-2023-08-28' of git://git.kernel.dk/linux
2023-08-29 20:21:42 -07:00
ioctl.c
lsm: new security_file_ioctl_compat() hook
2024-01-31 16:18:54 -08:00
Kconfig
nfs: add missing selections of CONFIG_CRC32
2025-04-25 10:45:46 +02:00
Kconfig.binfmt
riscv: support the elf-fdpic binfmt loader
2023-08-23 14:17:43 -07:00
kernel_read_file.c
fs: Fix kernel-doc warnings
2023-08-19 12:12:12 +02:00
libfs.c
libfs: Use d_children list to iterate simple_offset directories
2025-02-01 18:37:54 +01:00
locks.c
filelock: Fix fcntl/close race recovery compat path
2024-07-27 11:34:10 +02:00
Makefile
fs: add CONFIG_BUFFER_HEAD
2023-08-02 09:13:09 -06:00
mbcache.c
…
mnt_idmapping.c
…
mount.h
…
mpage.c
…
namei.c
fuse: don't truncate cached, mutated symlink
2025-03-22 12:50:44 -07:00
namespace.c
do_umount(): add missing barrier before refcount checks in sync case
2025-05-18 08:24:10 +02:00
nsfs.c
fs: convert to ctime accessor functions
2023-07-13 10:28:04 +02:00
open.c
openat2: explicitly return -E2BIG for (usize > PAGE_SIZE)
2024-11-01 01:58:32 +01:00
pipe.c
fs/pipe: Fix lockdep false-positive in watchqueue pipe_write()
2024-04-10 16:35:57 +02:00
pnode.c
…
pnode.h
…
posix_acl.c
fs: convert to ctime accessor functions
2023-07-13 10:28:04 +02:00
proc_namespace.c
…
read_write.c
fs: Fix one kernel-doc comment
2023-08-15 08:32:45 +02:00
readdir.c
vfs: get rid of old '->iterate' directory operation
2023-08-06 15:08:35 +02:00
remap_range.c
…
select.c
hrtimer: Use and report correct timerslack values for realtime tasks
2025-03-22 12:50:37 -07:00
seq_file.c
…
signalfd.c
…
splice.c
splice: remove duplicate noinline from pipe_clear_nowait
2025-05-02 07:50:45 +02:00
stack.c
fs: convert to ctime accessor functions
2023-07-13 10:28:04 +02:00
stat.c
fs: Pass AT_GETATTR_NOSEC flag to getattr interface function
2023-12-03 07:33:03 +01:00
statfs.c
…
super.c
fs: Convert to bdev_open_by_dev()
2024-08-19 06:04:25 +02:00
sync.c
…
sysctls.c
…
timerfd.c
…
userfaultfd.c
mm/userfaultfd: fix release hang over concurrent GUP
2025-04-25 10:45:31 +02:00
utimes.c
…
xattr.c
fs/xattr.c: fix simple_xattr_list to always include security.* xattrs
2025-05-22 14:12:11 +02:00