* [Bug tapsets/15690] New: syscall.rt_sigprocmask probe alias broken on s390x/ppc64 for 32-bit apps
@ 2013-06-27 15:45 dsmith at redhat dot com
2013-06-27 17:22 ` [Bug tapsets/15690] " dsmith at redhat dot com
0 siblings, 1 reply; 2+ messages in thread
From: dsmith at redhat dot com @ 2013-06-27 15:45 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=15690
Bug ID: 15690
Summary: syscall.rt_sigprocmask probe alias broken on
s390x/ppc64 for 32-bit apps
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: tapsets
Assignee: systemtap at sourceware dot org
Reporter: dsmith at redhat dot com
On s390x/ppc64, the syscall.rt_sigprocmask probe alias is broken when probing
32-bit apps, always displaying '[EMPTY]' for the sigset value.
Here's the definition of syscall.rt_sigprocmask from
tapset/linux/syscalls2.stp:
====
# rt_sigprocmask _____________________________________________
# long sys32_rt_sigprocmask(u32 how, compat_sigset_t __user *set,
compat_sigset_t __user *oset, size_t sigsetsize)
# long compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
compat_sigset_t __user *oset, compat_size_t sigsetsize)
# long sys_rt_sigprocmask(int how, sigset_t __user *set, sigset_t __user *oset,
size_t sigsetsize)
#
probe syscall.rt_sigprocmask = kernel.function("sys32_rt_sigprocmask").call ?,
kernel.function("compat_sys_rt_sigprocmask").call ?,
kernel.function("sys_rt_sigprocmask").call ?
{
name = "rt_sigprocmask"
how = $how
how_str = _sigprocmask_how_str($how)
set_uaddr = @choose_defined($set, $nset)
oldset_uaddr = $oset
argstr = sprintf("%s, [%s], %p, %d", how_str, _stp_sigset_u(set_uaddr),
$oset, $sigsetsize)
}
====
The problem is that the 'compat' entry points (compat_sys_rt_sigprocmask and
sys_rt_sigprocmask) don't get a 'sigset_t', they get a 'compat_sigset_t'. On
x86_64, a 'compat_sigset_t' is laid out similarly to a 'sigset_t'. On
big-endian platforms like ppc64 and s390x, a 'compat_sigset_t' is laid out
differently than a 'sigset_t'. Since _stp_sigset_u() isn't expecting a
'compat_sigset_t', it doesn't handle it correctly.
--
You are receiving this mail because:
You are the assignee for the bug.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug tapsets/15690] syscall.rt_sigprocmask probe alias broken on s390x/ppc64 for 32-bit apps
2013-06-27 15:45 [Bug tapsets/15690] New: syscall.rt_sigprocmask probe alias broken on s390x/ppc64 for 32-bit apps dsmith at redhat dot com
@ 2013-06-27 17:22 ` dsmith at redhat dot com
0 siblings, 0 replies; 2+ messages in thread
From: dsmith at redhat dot com @ 2013-06-27 17:22 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=15690
David Smith <dsmith at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #1 from David Smith <dsmith at redhat dot com> ---
Fixed in commit 4fe1137. Also fixes 'nd_syscall.rt_sigprocmask'.
--
You are receiving this mail because:
You are the assignee for the bug.
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2013-06-27 17:22 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-06-27 15:45 [Bug tapsets/15690] New: syscall.rt_sigprocmask probe alias broken on s390x/ppc64 for 32-bit apps dsmith at redhat dot com
2013-06-27 17:22 ` [Bug tapsets/15690] " dsmith at redhat dot com
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).