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Mike Frysinger 04e4f2b18c FDPIC: Respect PT_GNU_STACK exec protection markings when creating NOMMU stack 
The current code will load the stack size and protection markings, but
then only use the markings in the MMU code path.  The NOMMU code path
always passes PROT_EXEC to the mmap() call.  While this doesn't matter
to most people whilst the code is running, it will cause a pointless
icache flush when starting every FDPIC application.  Typically this
icache flush will be of a region on the order of 128KB in size, or may
be the entire icache, depending on the facilities available on the CPU.

In the case where the arch default behaviour seems to be desired
(EXSTACK_DEFAULT), we probe VM_STACK_FLAGS for VM_EXEC to determine
whether we should be setting PROT_EXEC or not.

For arches that support an MPU (Memory Protection Unit - an MMU without
the virtual mapping capability), setting PROT_EXEC or not will make an
important difference.

It should be noted that this change also affects the executability of
the brk region, since ELF-FDPIC has that share with the stack.  However,
this is probably irrelevant as NOMMU programs aren't likely to use the
brk region, preferring instead allocation via mmap().

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-01-06 18:16:02 -08:00
..
9p 9p: fix build breakage introduced by FS-Cache 2009-12-01 07:35:11 -08:00
adfs adfs: remove redundant test on unsigned 2009-09-24 07:21:05 -07:00
affs
afs afs: remove manual O_SYNC handling 2009-12-10 15:02:50 +01:00
autofs trivial: remove unnecessary semicolons 2009-09-21 15:14:58 +02:00
autofs4 autofs4: always use lookup for lookup 2009-12-16 07:19:58 -08:00
befs fs: Make unload_nls() NULL pointer safe 2009-09-24 07:47:42 -04:00
bfs
btrfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable 2009-12-17 16:01:03 -08:00
cachefiles Untangling ima mess, part 2: deal with counters 2009-12-16 12:16:47 -05:00
cifs Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6 2009-12-31 15:17:26 -08:00
coda sysctl: Drop & in front of every proc_handler. 2009-11-18 08:37:40 -08:00
configfs writeback: add name to backing_dev_info 2009-09-11 09:20:26 +02:00
cramfs
debugfs debugfs: fix create mutex racy fops and private data 2009-12-11 11:24:53 -08:00
devpts devpts_get_tty() should validate inode 2009-12-11 15:18:05 -08:00
dlm Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm 2009-12-10 09:33:59 -08:00
ecryptfs fsstack/ecryptfs: remove unused get_nlinks param to fsstack_copy_attr_all 2009-12-17 10:57:30 -05:00
efs
exofs exofs: simple_write_end does not mark_inode_dirty 2010-01-05 09:14:32 +02:00
exportfs nfs: new subdir Documentation/filesystems/nfs 2009-10-27 19:34:04 -04:00
ext2 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2009-12-16 12:04:02 -08:00
ext3 ext3: Replace lock/unlock_super() with an explicit lock for resizing 2009-12-23 13:44:12 +01:00
ext4 ext4: Calculate metadata requirements more accurately 2010-01-01 02:41:30 -05:00
fat Merge git://git.kernel.org/pub/scm/linux/kernel/git/hirofumi/fatfs-2.6 2009-12-16 10:29:26 -08:00
freevxfs
fscache FS-Cache: Avoid maybe-used-uninitialised warning on variable 2009-12-16 07:20:13 -08:00
fuse fuse: reject O_DIRECT flag also in fuse_create 2009-11-27 16:37:13 +01:00
gfs2 Revert "task_struct: make journal_info conditional" 2009-12-17 13:23:24 -08:00
hfs hfs: fix a potential buffer overflow 2009-12-15 08:53:10 -08:00
hfsplus hfsplus: refuse to mount volumes larger than 2TB 2009-10-29 07:39:27 -07:00
hostfs
hpfs hpfs: use bitmap_weight() 2009-12-16 07:20:06 -08:00
hppfs
hugetlbfs Untangling ima mess, part 1: alloc_file() 2009-12-16 12:16:47 -05:00
isofs Merge branch 'for-2.6.33' of git://linux-nfs.org/~bfields/linux 2009-12-16 10:43:34 -08:00
jbd jbd: jbd-debug and jbd2-debug should be writable 2009-12-23 13:44:13 +01:00
jbd2 jbd2: don't use __GFP_NOFAIL in journal_init_common() 2009-12-23 08:05:15 -05:00
jffs2 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2009-12-16 12:04:02 -08:00
jfs jfs: Fix 32bit build warning 2009-12-22 12:27:35 -05:00
lockd Merge branch 'for-2.6.33' of git://linux-nfs.org/~bfields/linux 2009-12-16 10:43:34 -08:00
minix V3 minixfs: add missing directory type checking 2009-09-23 07:39:57 -07:00
ncpfs tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
nfs Revert "fix mismerge with Trond's stuff (create_mnt_ns() export is gone now)" 2009-12-17 12:51:05 -08:00
nfs_common
nfsd Merge branch 'for-2.6.33' of git://linux-nfs.org/~bfields/linux 2010-01-06 18:10:15 -08:00
nilfs2 nilfs2: Storage class should be before const qualifier 2009-12-25 13:01:50 +09:00
nls Merge git://git.kernel.org/pub/scm/linux/kernel/git/hirofumi/fatfs-2.6 2009-09-30 09:31:14 -07:00
notify switch alloc_file() to passing struct path 2009-12-16 12:16:42 -05:00
ntfs kill I_LOCK 2009-12-17 11:03:25 -05:00
ocfs2 ocfs2: Handle O_DIRECT when writing to a refcounted cluster. 2009-12-30 19:53:35 -08:00
omfs tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
openpromfs
partitions partitions: read whole sector with EFI GPT header 2009-11-23 09:29:58 +01:00
proc Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-12-19 09:47:49 -08:00
qnx4 qnx4: use hweight8 2009-12-16 07:20:18 -08:00
quota quota: Improve checking of quota file header 2009-12-23 13:44:13 +01:00
ramfs nommu: ramfs: remove unused local var 2009-12-17 15:45:31 -08:00
reiserfs Merge branch 'reiserfs/kill-bkl' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing 2010-01-02 11:17:05 -08:00
romfs ROMFS: fix length used with romfs_dev_strnlen() function 2009-10-11 11:33:56 -07:00
smbfs fs: Make unload_nls() NULL pointer safe 2009-09-24 07:47:42 -04:00
squashfs const: mark remaining super_operations const 2009-09-22 07:17:24 -07:00
sysfs sysfs: Add lockdep annotations for the sysfs active reference 2010-01-04 12:34:46 -08:00
sysv
ubifs kill I_LOCK 2009-12-17 11:03:25 -05:00
udf udf: Avoid IO in udf_clear_inode 2009-12-14 21:40:04 +01:00
ufs ufs: NFS support 2009-12-16 07:20:06 -08:00
xfs kill I_LOCK 2009-12-17 11:03:25 -05:00
aio.c aio: remove unused field 2009-12-16 07:20:13 -08:00
anon_inodes.c Sanitize f_flags helpers 2009-12-22 12:27:34 -05:00
attr.c truncate: new helpers 2009-09-24 08:41:47 -04:00
bad_inode.c
binfmt_aout.c mm: introduce coredump parameter structure 2009-12-17 15:45:31 -08:00
binfmt_elf_fdpic.c FDPIC: Respect PT_GNU_STACK exec protection markings when creating NOMMU stack 2010-01-06 18:16:02 -08:00
binfmt_elf.c mm: introduce coredump parameter structure 2009-12-17 15:45:31 -08:00
binfmt_em86.c
binfmt_flat.c mm: introduce coredump parameter structure 2009-12-17 15:45:31 -08:00
binfmt_misc.c
binfmt_script.c
binfmt_som.c mm: introduce coredump parameter structure 2009-12-17 15:45:31 -08:00
bio-integrity.c
bio.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-12-09 19:43:33 -08:00
block_dev.c Merge branch 'for-linus' into for-2.6.33 2009-11-03 21:14:39 +01:00
buffer.c Merge branch 'writeback' of git://git.kernel.dk/linux-2.6-block 2009-09-25 09:27:30 -07:00
char_dev.c fs/char_dev.c: remove useless loop 2009-09-24 07:21:03 -07:00
compat_binfmt_elf.c
compat_ioctl.c fs/compat_ioctl.c: fix build error when !BLOCK 2009-12-22 12:27:33 -05:00
compat.c compat.c: Remove dependence on nfsd private headers 2009-12-14 18:12:10 -05:00
dcache.c libfs: move EXPORT_SYMBOL for d_alloc_name 2009-12-16 12:16:48 -05:00
dcookies.c
direct-io.c dio: fix use-after-free 2009-12-17 04:52:13 -05:00
drop_caches.c sysctl: remove "struct file *" argument of ->proc_handler 2009-09-24 07:21:04 -07:00
eventfd.c anonfd: Allow making anon files read-only 2009-12-22 12:27:34 -05:00
eventpoll.c anonfd: Allow making anon files read-only 2009-12-22 12:27:34 -05:00
exec.c mm: introduce coredump parameter structure 2009-12-17 15:45:31 -08:00
fcntl.c fcntl: rename F_OWNER_GID to F_OWNER_PGRP 2009-11-17 17:40:33 -08:00
fifo.c
file_table.c alloc_file(): simplify handling of mnt_clone_write() errors 2009-12-22 12:27:33 -05:00
file.c headers: remove sched.h from interrupt.h 2009-10-11 11:20:58 -07:00
filesystems.c
fs_struct.c
fs-writeback.c writeback: add missing kernel-doc notation 2010-01-02 10:09:44 -08:00
generic_acl.c make generic_acl slightly more generic 2009-12-16 12:16:49 -05:00
inode.c kill I_LOCK 2009-12-17 11:03:25 -05:00
internal.h Fix f_flags/f_mode in case of lookup_instantiate_filp() from open(pathname, 3) 2009-12-22 12:27:34 -05:00
ioctl.c __generic_block_fiemap(): fix for files bigger than 4GB 2009-11-12 07:26:01 -08:00
ioprio.c
Kconfig Revert "task_struct: make journal_info conditional" 2009-12-17 13:23:24 -08:00
Kconfig.binfmt
libfs.c libfs: move EXPORT_SYMBOL for d_alloc_name 2009-12-16 12:16:48 -05:00
locks.c const: make lock_manager_operations const 2009-09-22 07:17:25 -07:00
Makefile
mbcache.c
mpage.c
namei.c generic_permission: MAY_OPEN is not write access 2009-12-30 12:35:44 -08:00
namespace.c Revert "fix mismerge with Trond's stuff (create_mnt_ns() export is gone now)" 2009-12-17 12:51:05 -08:00
nfsctl.c vfs: nfsctl.c un-used nfsd #includes 2009-12-14 18:12:11 -05:00
no-block.c
open.c Sanitize f_flags helpers 2009-12-22 12:27:34 -05:00
pipe.c fs: no games with DCACHE_UNHASHED 2009-12-17 10:51:40 -05:00
pnode.c
pnode.h
posix_acl.c
read_write.c sendfile(): check f_op.splice_write() rather than f_op.sendpage() 2009-11-04 09:09:52 +01:00
read_write.h
readdir.c
select.c headers: remove sched.h from poll.h 2009-10-04 15:05:10 -07:00
seq_file.c vfs: seq_file: add helpers for data filling 2009-09-24 07:47:35 -04:00
signalfd.c anonfd: Allow making anon files read-only 2009-12-22 12:27:34 -05:00
splice.c sendfile(): check f_op.splice_write() rather than f_op.sendpage() 2009-11-04 09:09:52 +01:00
stack.c VFS/fsstack: handle 32-bit smp + preempt + large files in fsstack_copy_inode_size 2009-12-17 10:58:17 -05:00
stat.c Add unlocked version of inode_add_bytes() function 2009-12-23 13:33:54 +01:00
super.c vfs: get_sb_single() - do not pass options twice 2009-12-23 11:23:43 -08:00
sync.c fold do_sync_file_range into sys_sync_file_range 2009-12-17 11:03:25 -05:00
timerfd.c anonfd: Allow making anon files read-only 2009-12-22 12:27:34 -05:00
utimes.c
xattr_acl.c VFS: Use GFP_NOFS in posix_acl_from_xattr() 2009-12-03 11:48:07 +00:00
xattr.c sanitize xattr handler prototypes 2009-12-16 12:16:49 -05:00