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>
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| File | Mode | Size |
|---|---|---|
| Kbuild | -rw-r--r-- | 675 bytes |
| asm-offsets.h | -rw-r--r-- | 35 bytes |
| axisflashmap.h | -rw-r--r-- | 1.9 KB |
| bitops.h | -rw-r--r-- | 1.2 KB |
| bug.h | -rw-r--r-- | 69 bytes |
| bugs.h | -rw-r--r-- | 300 bytes |
| cache.h | -rw-r--r-- | 94 bytes |
| cacheflush.h | -rw-r--r-- | 1.3 KB |
| checksum.h | -rw-r--r-- | 2.0 KB |
| current.h | -rw-r--r-- | 268 bytes |
| delay.h | -rw-r--r-- | 498 bytes |
| dma-mapping.h | -rw-r--r-- | 4.1 KB |
| dma.h | -rw-r--r-- | 419 bytes |
| elf.h | -rw-r--r-- | 2.7 KB |
| eshlibld.h | -rw-r--r-- | 3.5 KB |
| etraxi2c.h | -rw-r--r-- | 980 bytes |
| fasttimer.h | -rw-r--r-- | 1.1 KB |
| fb.h | -rw-r--r-- | 205 bytes |
| ftrace.h | -rw-r--r-- | 12 bytes |
| hw_irq.h | -rw-r--r-- | 53 bytes |
| io.h | -rw-r--r-- | 5.5 KB |
| irq.h | -rw-r--r-- | 155 bytes |
| irqflags.h | -rw-r--r-- | 27 bytes |
| mmu.h | -rw-r--r-- | 116 bytes |
| mmu_context.h | -rw-r--r-- | 762 bytes |
| mutex.h | -rw-r--r-- | 308 bytes |
| page.h | -rw-r--r-- | 2.5 KB |
| pci.h | -rw-r--r-- | 1.5 KB |
| pgalloc.h | -rw-r--r-- | 1.4 KB |
| pgtable.h | -rw-r--r-- | 9.5 KB |
| processor.h | -rw-r--r-- | 1.9 KB |
| ptrace.h | -rw-r--r-- | 354 bytes |
| segment.h | -rw-r--r-- | 109 bytes |
| serial.h | -rw-r--r-- | 172 bytes |
| shmparam.h | -rw-r--r-- | 193 bytes |
| signal.h | -rw-r--r-- | 466 bytes |
| string.h | -rw-r--r-- | 469 bytes |
| swab.h | -rw-r--r-- | 120 bytes |
| switch_to.h | -rw-r--r-- | 410 bytes |
| termios.h | -rw-r--r-- | 1.7 KB |
| thread_info.h | -rw-r--r-- | 2.4 KB |
| timex.h | -rw-r--r-- | 394 bytes |
| tlb.h | -rw-r--r-- | 414 bytes |
| tlbflush.h | -rw-r--r-- | 1.0 KB |
| types.h | -rw-r--r-- | 189 bytes |
| uaccess.h | -rw-r--r-- | 11.6 KB |
| ucontext.h | -rw-r--r-- | 283 bytes |
| unaligned.h | -rw-r--r-- | 306 bytes |
| unistd.h | -rw-r--r-- | 933 bytes |
| user.h | -rw-r--r-- | 2.1 KB |
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