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x86: sigframe -- Don't forget to copy ss

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Make sure we don't pass any trash value here, because
the kernel does copy it explicitly. We allocate the
memory for frame as zero filled but stack segment
is special and zero is not acceptable (we've had
a discussion on LKML if we need a special handling
for zero ss but end up that new kernels need new CRIU
version, upon which all agreed). Finally in
commit 296bbf7e3 I managed to hit exactly
this problem :)

Reported-by: Andrey Wagin <avagin@gmail.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Andrey Wagin <avagin@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Cyrill Gorcunov
2015-07-30 01:10:00 +03:00
committed by Pavel Emelyanov
parent 3e0b09b1b5
commit cab42bca65
1 changed files with 0 additions and 3 deletions
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arch/x86/crtools.c
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@@ -486,10 +486,7 @@ int restore_gpregs(struct rt_sigframe *f, UserX86RegsEntry *r)
CPREG2(eflags, flags);
CPREG1(cs);
#ifdef CONFIG_X86_32
CPREG1(ss);
#endif
#ifdef CONFIG_X86_32
CPREG1(gs);