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x86: ptrace: do not sign-extend orig_ax on write
The high 32 bits of orig_ax will be ignored when it matters, so don't fiddle them when setting it. Signed-off-by: Roland McGrath <roland@redhat.com>
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18c1e2c80d
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08ff18e299
1 changed files with 1 additions and 18 deletions
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@ -325,16 +325,6 @@ static int putreg(struct task_struct *child,
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return set_flags(child, value);
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#ifdef CONFIG_X86_64
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/*
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* Orig_ax is really just a flag with small positive and
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* negative values, so make sure to always sign-extend it
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* from 32 bits so that it works correctly regardless of
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* whether we come from a 32-bit environment or not.
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*/
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case offsetof(struct user_regs_struct, orig_ax):
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value = (long) (s32) value;
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break;
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case offsetof(struct user_regs_struct,fs_base):
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if (value >= TASK_SIZE_OF(child))
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return -EIO;
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@ -1121,17 +1111,10 @@ static int putreg32(struct task_struct *child, unsigned regno, u32 value)
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R32(esi, si);
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R32(ebp, bp);
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R32(eax, ax);
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R32(orig_eax, orig_ax);
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R32(eip, ip);
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R32(esp, sp);
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case offsetof(struct user32, regs.orig_eax):
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/*
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* Sign-extend the value so that orig_eax = -1
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* causes (long)orig_ax < 0 tests to fire correctly.
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*/
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regs->orig_ax = (long) (s32) value;
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break;
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case offsetof(struct user32, regs.eflags):
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return set_flags(child, value);
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