Revision 61f01dd941ba9e06d2bf05994450ecc3d61b6b8b authored by Andy Lutomirski on 26 April 2015, 23:47:59 UTC, committed by Linus Torvalds on 27 April 2015, 00:57:38 UTC
AMD CPUs don't reinitialize the SS descriptor on SYSRET, so SYSRET with SS == 0 results in an invalid usermode state in which SS is apparently equal to __USER_DS but causes #SS if used. Work around the issue by setting SS to __KERNEL_DS __switch_to, thus ensuring that SYSRET never happens with SS set to NULL. This was exposed by a recent vDSO cleanup. Fixes: e7d6eefaaa44 x86/vdso32/syscall.S: Do not load __USER32_DS to %ss Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Peter Anvin <hpa@zytor.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Denys Vlasenko <vda.linux@googlemail.com> Cc: Brian Gerst <brgerst@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 1190944
| File | Mode | Size |
|---|---|---|
| 00-INDEX | -rw-r--r-- | 818 bytes |
| biodoc.txt | -rw-r--r-- | 52.8 KB |
| biovecs.txt | -rw-r--r-- | 5.5 KB |
| capability.txt | -rw-r--r-- | 618 bytes |
| cfq-iosched.txt | -rw-r--r-- | 12.5 KB |
| cmdline-partition.txt | -rw-r--r-- | 1.3 KB |
| data-integrity.txt | -rw-r--r-- | 11.9 KB |
| deadline-iosched.txt | -rw-r--r-- | 2.8 KB |
| ioprio.txt | -rw-r--r-- | 4.6 KB |
| null_blk.txt | -rw-r--r-- | 2.5 KB |
| queue-sysfs.txt | -rw-r--r-- | 4.8 KB |
| request.txt | -rw-r--r-- | 2.0 KB |
| stat.txt | -rw-r--r-- | 3.2 KB |
| switching-sched.txt | -rw-r--r-- | 1.4 KB |
| writeback_cache_control.txt | -rw-r--r-- | 3.8 KB |
Computing file changes ...
