CODEWITHSUNDEEP
windbgbreakpointsconditional-breakpoint
Migo Lopak
Migo Lopak

Reputation: 39

Ignore some locations in Windbg Conditional breakpoints

I'm trying to set a conditional hardware breakpoint on Windows Kernel-Mode in Windbg by using the following syntax :

ba w1 ffff802312345678 "j(@rip==ffff802387654321 || @rip==ffff802387654330) 'gc';''"

I used the above command in order to ignore every access to my target location (ffff802312345678) from ffff802387654321 or ffff802387654330, so everytime access from somewhere else is taken, then I would be notified.

But the problem is, it still breaks on ffff802387654321 or ffff802387654330 among the other locations.

I also read it's official documents about "Conditional Breakpoints and Register Sign Extension" and also test something like this:

ba w1 ffff802312345678 "j((@rip & 0xffffffffffffffff)=ffff802387654321 || (@rip & 0xffffffffffffffff)=ffff802387654330) 'gc';''"

But it still won't work.

So my question is:

Upvotes: 2

Views: 153

Answers (1)

Thomas Weller
Thomas Weller

Reputation: 59615

There is no || MASM operator. It's or.

Use

ba w1 ffff802312345678 "j(@rip==ffff802387654321 or @rip==ffff802387654330) 'gc';''"

I have not reproduced your exact case, but a simpler example:

0:000> r rip
rip=0000000076db6fb0
0:000> j (@rip==0000000076db6fb0 || @rip==0) '.echo 5';'.echo 6"
Numeric expression missing from '| @rip==0) '.echo 5';'.echo 6"'
0:000> j (@rip==0000000076db6fb0 or @rip==0) '.echo 5';'.echo 6"
5

Upvotes: 1

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