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x86/asm/32: Fix regs_get_register() on segment registers 

The segment register high words on x86_32 may contain garbage.
Teach regs_get_register() to read them as u16 instead of unsigned
long.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/0b76f6dbe477b7b1a81938fddcc3c483d48f0ff2.1502314765.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Andy Lutomirski 2017-08-09 14:39:45 -07:00 committed by Ingo Molnar
parent 8a9949bc71
commit 603e492e86
1 changed files with 11 additions and 0 deletions
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11
arch/x86/include/asm/ptrace.h
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@ -196,6 +196,17 @@ static inline unsigned long regs_get_register(struct pt_regs *regs,
if (offset == offsetof(struct pt_regs, sp) &&
regs->cs == __KERNEL_CS)
return kernel_stack_pointer(regs);
/* The selector fields are 16-bit. */
if (offset == offsetof(struct pt_regs, cs) ||
offset == offsetof(struct pt_regs, ss) ||
offset == offsetof(struct pt_regs, ds) ||
offset == offsetof(struct pt_regs, es) ||
offset == offsetof(struct pt_regs, fs) ||
offset == offsetof(struct pt_regs, gs)) {
return *(u16 *)((unsigned long)regs + offset);
}
#endif
return *(unsigned long *)((unsigned long)regs + offset);
}