#ifndef STR_H
#define STR_H

#include <stdlib.h>

#include "built_in.h"

extern size_t strlcpy(char *dest, const char *src, size_t size);
extern int slprintf(char *dst, size_t size, const char *fmt, ...)  __check_format_printf(3, 4);
extern int slprintf_nocheck(char *dst, size_t size, const char *fmt, ...);
extern char *strtrim_right(char *p, char c);
extern noinline void *xmemset(void *s, int c, size_t n);
extern char *argv2str(int startind, int argc, char **argv);
extern char **argv_insert(char **argv, size_t *count, const char *str);
extern void argv_free(char **argv);
extern int str2mac(const char *str, uint8_t *mac, size_t len);

#endif /* STR_H */
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<tr><th>author</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2016-10-22 11:07:37 +0000</td></tr>
<tr><th>committer</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2016-10-25 16:32:50 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=6bad6bccf2d717f652d37e63cf261eaa23466009'>6bad6bccf2d717f652d37e63cf261eaa23466009</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=6bad6bccf2d717f652d37e63cf261eaa23466009'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=6bad6bccf2d717f652d37e63cf261eaa23466009'>9a22c3c4a778297bf544a0cc89da0c76c8784d6b</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=041ad7bc758db259bb960ef795197dd14aab19a6'>041ad7bc758db259bb960ef795197dd14aab19a6</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=6bad6bccf2d717f652d37e63cf261eaa23466009&amp;id2=041ad7bc758db259bb960ef795197dd14aab19a6'>diff</a>)</td></tr></table>
<div class='commit-subject'>timers: Prevent base clock corruption when forwarding</div><div class='commit-msg'>When a timer is enqueued we try to forward the timer base clock. This
mechanism has two issues:

1) Forwarding a remote base unlocked

The forwarding function is called from get_target_base() with the current
timer base lock held. But if the new target base is a different base than
the current base (can happen with NOHZ, sigh!) then the forwarding is done
on an unlocked base. This can lead to corruption of base-&gt;clk.

Solution is simple: Invoke the forwarding after the target base is locked.

2) Possible corruption due to jiffies advancing

This is similar to the issue in get_net_timer_interrupt() which was fixed
in the previous patch. jiffies can advance between check and assignement
and therefore advancing base-&gt;clk beyond the next expiry value.

So we need to read jiffies into a local variable once and do the checks and
assignment with the local copy.

Fixes: a683f390b93f("timers: Forward the wheel clock whenever possible")
Reported-by: Ashton Holmes &lt;scoopta@gmail.com&gt;
Reported-by: Michael Thayer &lt;michael.thayer@oracle.com&gt;
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Cc: Michal Necasek &lt;michal.necasek@oracle.com&gt;
Cc: Peter Zijlstra &lt;peterz@infradead.org&gt;
Cc: knut.osmundsen@oracle.com
Cc: stable@vger.kernel.org
Cc: stern@rowland.harvard.edu
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20161022110552.253640125@linutronix.de
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;

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