| Re: utrace regressions (was: -mm merge plans for 2.6.21) [message #10247 is a reply to message #10229] |
Tue, 13 February 2007 15:28   |
adobriyan
Messages: 80
Registered: November 2006
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Member |
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On Mon, Feb 12, 2007 at 01:36:34PM -0800, Roland McGrath wrote:
> > We're aware of two regressions compared to mainline if ptrace is utrace:
>
> Thanks very much for bringing these to my attention.
>
> > 1) zero holes for PTRACE_PEEKUSR vanished.
>
> I've fixed this in the current patches.
Looking at mainline x86_64 ptrace code I think hole for u_debugreg[4]
and [5] is also needed.
--- a/arch/x86_64/kernel/ptrace.c
+++ b/arch/x86_64/kernel/ptrace.c
@@ -687,6 +687,8 @@ EXPORT_SYMBOL_GPL(utrace_x86_64_native);
#ifdef CONFIG_PTRACE
static const struct ptrace_layout_segment x86_64_uarea[] = {
{0, sizeof(struct user_regs_struct), 0, 0},
+ {sizeof(struct user_regs_struct),
+ offsetof(struct user, u_debugreg[0]), -1, 0},
{offsetof(struct user, u_debugreg[0]),
offsetof(struct user, u_debugreg[4]), 3, 0},
{offsetof(struct user, u_debugreg[6]),
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