https://github.com/torvalds/linux
Revision 956421fbb74c3a6261903f3836c0740187cf038b authored by Andy Lutomirski on 05 March 2015, 00:09:44 UTC, committed by Ingo Molnar on 05 March 2015, 00:12:23 UTC
'ret_from_fork' checks TIF_IA32 to determine whether 'pt_regs' and the related state make sense for 'ret_from_sys_call'. This is entirely the wrong check. TS_COMPAT would make a little more sense, but there's really no point in keeping this optimization at all. This fixes a return to the wrong user CS if we came from int 0x80 in a 64-bit task. Signed-off-by: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: <stable@vger.kernel.org> Link: http://lkml.kernel.org/r/4710be56d76ef994ddf59087aad98c000fbab9a4.1424989793.git.luto@amacapital.net [ Backported from tip:x86/asm. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Tip revision: 956421fbb74c3a6261903f3836c0740187cf038b authored by Andy Lutomirski on 05 March 2015, 00:09:44 UTC
x86/asm/entry/64: Remove a bogus 'ret_from_fork' optimization
x86/asm/entry/64: Remove a bogus 'ret_from_fork' optimization
Tip revision: 956421f
| File | Mode | Size |
|---|---|---|
| 9p | ||
| adfs | ||
| affs | ||
| afs | ||
| autofs4 | ||
| befs | ||
| bfs | ||
| btrfs | ||
| cachefiles | ||
| ceph | ||
| cifs | ||
| coda | ||
| configfs | ||
| cramfs | ||
| debugfs | ||
| devpts | ||
| dlm | ||
| ecryptfs | ||
| efivarfs | ||
| efs | ||
| exofs | ||
| exportfs | ||
| ext2 | ||
| ext3 | ||
| ext4 | ||
| f2fs | ||
| fat | ||
| freevxfs | ||
| fscache | ||
| fuse | ||
| gfs2 | ||
| hfs | ||
| hfsplus | ||
| hostfs | ||
| hpfs | ||
| hppfs | ||
| hugetlbfs | ||
| isofs | ||
| jbd | ||
| jbd2 | ||
| jffs2 | ||
| jfs | ||
| kernfs | ||
| lockd | ||
| logfs | ||
| minix | ||
| ncpfs | ||
| nfs | ||
| nfs_common | ||
| nfsd | ||
| nilfs2 | ||
| nls | ||
| notify | ||
| ntfs | ||
| ocfs2 | ||
| omfs | ||
| openpromfs | ||
| overlayfs | ||
| proc | ||
| pstore | ||
| qnx4 | ||
| qnx6 | ||
| quota | ||
| ramfs | ||
| reiserfs | ||
| romfs | ||
| squashfs | ||
| sysfs | ||
| sysv | ||
| ubifs | ||
| udf | ||
| ufs | ||
| xfs | ||
| Kconfig | -rw-r--r-- | 6.5 KB |
| Kconfig.binfmt | -rw-r--r-- | 7.1 KB |
| Makefile | -rw-r--r-- | 4.1 KB |
| aio.c | -rw-r--r-- | 42.6 KB |
| anon_inodes.c | -rw-r--r-- | 4.9 KB |
| attr.c | -rw-r--r-- | 7.9 KB |
| bad_inode.c | -rw-r--r-- | 4.7 KB |
| binfmt_aout.c | -rw-r--r-- | 10.8 KB |
| binfmt_elf.c | -rw-r--r-- | 60.6 KB |
| binfmt_elf_fdpic.c | -rw-r--r-- | 46.9 KB |
| binfmt_em86.c | -rw-r--r-- | 2.8 KB |
| binfmt_flat.c | -rw-r--r-- | 26.4 KB |
| binfmt_misc.c | -rw-r--r-- | 17.7 KB |
| binfmt_script.c | -rw-r--r-- | 3.0 KB |
| block_dev.c | -rw-r--r-- | 44.9 KB |
| buffer.c | -rw-r--r-- | 88.8 KB |
| char_dev.c | -rw-r--r-- | 13.3 KB |
| compat.c | -rw-r--r-- | 37.2 KB |
| compat_binfmt_elf.c | -rw-r--r-- | 3.7 KB |
| compat_ioctl.c | -rw-r--r-- | 45.4 KB |
| coredump.c | -rw-r--r-- | 18.1 KB |
| dax.c | -rw-r--r-- | 14.6 KB |
| dcache.c | -rw-r--r-- | 88.7 KB |
| dcookies.c | -rw-r--r-- | 6.9 KB |
| direct-io.c | -rw-r--r-- | 37.6 KB |
| drop_caches.c | -rw-r--r-- | 1.6 KB |
| eventfd.c | -rw-r--r-- | 11.2 KB |
| eventpoll.c | -rw-r--r-- | 59.0 KB |
| exec.c | -rw-r--r-- | 40.0 KB |
| fcntl.c | -rw-r--r-- | 16.6 KB |
| fhandle.c | -rw-r--r-- | 6.5 KB |
| file.c | -rw-r--r-- | 21.5 KB |
| file_table.c | -rw-r--r-- | 8.4 KB |
| filesystems.c | -rw-r--r-- | 6.4 KB |
| fs-writeback.c | -rw-r--r-- | 41.5 KB |
| fs_pin.c | -rw-r--r-- | 1.9 KB |
| fs_struct.c | -rw-r--r-- | 3.3 KB |
| inode.c | -rw-r--r-- | 52.1 KB |
| internal.h | -rw-r--r-- | 3.5 KB |
| ioctl.c | -rw-r--r-- | 15.7 KB |
| libfs.c | -rw-r--r-- | 27.9 KB |
| locks.c | -rw-r--r-- | 68.6 KB |
| mbcache.c | -rw-r--r-- | 24.1 KB |
| mount.h | -rw-r--r-- | 3.5 KB |
| mpage.c | -rw-r--r-- | 19.9 KB |
| namei.c | -rw-r--r-- | 112.5 KB |
| namespace.c | -rw-r--r-- | 78.0 KB |
| no-block.c | -rw-r--r-- | 688 bytes |
| nsfs.c | -rw-r--r-- | 3.4 KB |
| open.c | -rw-r--r-- | 26.7 KB |
| pipe.c | -rw-r--r-- | 25.0 KB |
| pnode.c | -rw-r--r-- | 10.1 KB |
| pnode.h | -rw-r--r-- | 1.7 KB |
| posix_acl.c | -rw-r--r-- | 19.9 KB |
| proc_namespace.c | -rw-r--r-- | 7.8 KB |
| read_write.c | -rw-r--r-- | 31.3 KB |
| readdir.c | -rw-r--r-- | 6.9 KB |
| select.c | -rw-r--r-- | 25.4 KB |
| seq_file.c | -rw-r--r-- | 21.1 KB |
| signalfd.c | -rw-r--r-- | 9.1 KB |
| splice.c | -rw-r--r-- | 45.8 KB |
| stack.c | -rw-r--r-- | 2.5 KB |
| stat.c | -rw-r--r-- | 12.0 KB |
| statfs.c | -rw-r--r-- | 5.3 KB |
| super.c | -rw-r--r-- | 35.3 KB |
| sync.c | -rw-r--r-- | 9.7 KB |
| timerfd.c | -rw-r--r-- | 13.0 KB |
| utimes.c | -rw-r--r-- | 5.9 KB |
| xattr.c | -rw-r--r-- | 22.8 KB |
Computing file changes ...
