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x86-64: Improve vsyscall emulation CS and RIP handling

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Three fixes here:
 - Send SIGSEGV if called from compat code or with a funny CS.
 - Don't BUG on impossible addresses.
 - Add a missing local_irq_disable.

This patch also removes an unused variable.

Signed-off-by: Andy Lutomirski <luto@mit.edu>
Link: http://lkml.kernel.org/r/6fb2b13ab39b743d1e4f466eef13425854912f7f.1310563276.git.luto@mit.edu
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Andy Lutomirski
2011-07-13 09:24:09 -04:00
committed by H. Peter Anvin
parent 5cec93c216
commit c9712944b2
2 changed files with 41 additions and 32 deletions
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12
arch/x86/include/asm/vsyscall.h
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@@ -31,18 +31,6 @@ extern struct timezone sys_tz;
extern void map_vsyscall(void);
/* Emulation */
static inline bool is_vsyscall_entry(unsigned long addr)
{
return (addr & ~0xC00UL) == VSYSCALL_START;
}
static inline int vsyscall_entry_nr(unsigned long addr)
{
return (addr & 0xC00UL) >> 10;
}
#endif /* __KERNEL__ */
#endif /* _ASM_X86_VSYSCALL_H */