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From: Jan Beulich <jbeulich@suse.com>
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Subject: xenoprof: limit consumption of shared buffer data
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Since a shared buffer can be written to by the guest, we may only read
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the head and tail pointers from there (all other fields should only ever
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be written to). Furthermore, for any particular operation the two values
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must be read exactly once, with both checks and consumption happening
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with the thus read values. (The backtrace related xenoprof_buf_space()
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use in xenoprof_log_event() is an exception: The values used there get
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re-checked by every subsequent xenoprof_add_sample().)
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Since that code needed touching, also fix the double increment of the
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lost samples count in case the backtrace related xenoprof_add_sample()
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invocation in xenoprof_log_event() fails.
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Where code is being touched anyway, add const as appropriate, but take
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the opportunity to entirely drop the now unused domain parameter of
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xenoprof_buf_space().
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This is part of XSA-313.
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Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
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Signed-off-by: Jan Beulich <jbeulich@suse.com>
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Reviewed-by: George Dunlap <george.dunlap@citrix.com>
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Reviewed-by: Wei Liu <wl@xen.org>
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--- a/xen/common/xenoprof.c
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+++ b/xen/common/xenoprof.c
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@@ -479,25 +479,22 @@ static int add_passive_list(XEN_GUEST_HA
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/* Get space in the buffer */
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-static int xenoprof_buf_space(struct domain *d, xenoprof_buf_t * buf, int size)
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+static int xenoprof_buf_space(int head, int tail, int size)
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{
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- int head, tail;
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-
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- head = xenoprof_buf(d, buf, event_head);
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- tail = xenoprof_buf(d, buf, event_tail);
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-
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return ((tail > head) ? 0 : size) + tail - head - 1;
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}
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/* Check for space and add a sample. Return 1 if successful, 0 otherwise. */
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-static int xenoprof_add_sample(struct domain *d, xenoprof_buf_t *buf,
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+static int xenoprof_add_sample(const struct domain *d,
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+ const struct xenoprof_vcpu *v,
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uint64_t eip, int mode, int event)
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{
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+ xenoprof_buf_t *buf = v->buffer;
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int head, tail, size;
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head = xenoprof_buf(d, buf, event_head);
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tail = xenoprof_buf(d, buf, event_tail);
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- size = xenoprof_buf(d, buf, event_size);
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+ size = v->event_size;
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/* make sure indexes in shared buffer are sane */
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if ( (head < 0) || (head >= size) || (tail < 0) || (tail >= size) )
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@@ -506,7 +503,7 @@ static int xenoprof_add_sample(struct do
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return 0;
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}
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- if ( xenoprof_buf_space(d, buf, size) > 0 )
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+ if ( xenoprof_buf_space(head, tail, size) > 0 )
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{
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xenoprof_buf(d, buf, event_log[head].eip) = eip;
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xenoprof_buf(d, buf, event_log[head].mode) = mode;
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@@ -530,7 +527,6 @@ static int xenoprof_add_sample(struct do
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int xenoprof_add_trace(struct vcpu *vcpu, uint64_t pc, int mode)
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{
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struct domain *d = vcpu->domain;
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- xenoprof_buf_t *buf = d->xenoprof->vcpu[vcpu->vcpu_id].buffer;
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/* Do not accidentally write an escape code due to a broken frame. */
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if ( pc == XENOPROF_ESCAPE_CODE )
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@@ -539,7 +535,8 @@ int xenoprof_add_trace(struct vcpu *vcpu
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return 0;
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}
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- return xenoprof_add_sample(d, buf, pc, mode, 0);
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+ return xenoprof_add_sample(d, &d->xenoprof->vcpu[vcpu->vcpu_id],
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+ pc, mode, 0);
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}
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void xenoprof_log_event(struct vcpu *vcpu, const struct cpu_user_regs *regs,
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@@ -570,17 +567,22 @@ void xenoprof_log_event(struct vcpu *vcp
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/* Provide backtrace if requested. */
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if ( backtrace_depth > 0 )
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
{
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
- if ( (xenoprof_buf_space(d, buf, v->event_size) < 2) ||
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
- !xenoprof_add_sample(d, buf, XENOPROF_ESCAPE_CODE, mode,
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
- XENOPROF_TRACE_BEGIN) )
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
+ if ( xenoprof_buf_space(xenoprof_buf(d, buf, event_head),
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
+ xenoprof_buf(d, buf, event_tail),
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
+ v->event_size) < 2 )
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
{
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
xenoprof_buf(d, buf, lost_samples)++;
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
lost_samples++;
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
return;
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
}
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
+
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
+ /* xenoprof_add_sample() will increment lost_samples on failure */
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
+ if ( !xenoprof_add_sample(d, v, XENOPROF_ESCAPE_CODE, mode,
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
+ XENOPROF_TRACE_BEGIN) )
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
+ return;
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
}
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
- if ( xenoprof_add_sample(d, buf, pc, mode, event) )
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
+ if ( xenoprof_add_sample(d, v, pc, mode, event) )
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
{
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
if ( is_active(vcpu->domain) )
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
active_samples++;
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
--- a/xen/include/xen/xenoprof.h
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
+++ b/xen/include/xen/xenoprof.h
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
@@ -61,12 +61,12 @@ struct xenoprof {
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
#ifndef CONFIG_COMPAT
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
#define XENOPROF_COMPAT(x) 0
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
-#define xenoprof_buf(d, b, field) ((b)->field)
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
+#define xenoprof_buf(d, b, field) ACCESS_ONCE((b)->field)
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
#else
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
#define XENOPROF_COMPAT(x) ((x)->is_compat)
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
-#define xenoprof_buf(d, b, field) (*(!(d)->xenoprof->is_compat ? \
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
- &(b)->native.field : \
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
- &(b)->compat.field))
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
+#define xenoprof_buf(d, b, field) ACCESS_ONCE(*(!(d)->xenoprof->is_compat \
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
+ ? &(b)->native.field \
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
+ : &(b)->compat.field))
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
#endif
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
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![](https://seccdn.libravatar.org/avatar/f1a0ddfc363b14e167bf8548e95f340032d1964ae5b6ea4f235e351fd948008e?s=16&d=retro) |
fc71df9 |
struct domain;
|