[Bug libc/1780] size of sigset_t in ucontext_t structure does not match linux kernel

[Bug libc/1780] size of sigset_t in ucontext_t structure does not match linux kernel

[neelakan at uiuc dot edu]

------- Additional Comments From neelakan at uiuc dot edu  2005-12-22 20:20 -------
The kernel sets the value of uc_mcontext.fpregs to the correct address of the
__fpregs_mem structure.  A user-level program that checks the address of the
__fpregs_mem structure should get the same value as contained in uc_mcontext.fpregs.

The problem arises because of the way that the glibc header files define the
size of the __sigset_t struct in ucontext_t (see /usr/include/sys/ucontext.h). 
The sigset_t struct should match the definition used by the kernel (which is
"unsigned long[2]" if I remember correctly), but is instead defined as "usigned
long int[32]" in  the glibc header file /usr/include/bits/sigset.h.

Does that answer your question?

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[Bug libc/1780] size of sigset_t in ucontext_t structure does not match linux kernel

[decimal at us dot ibm dot com]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|drepper at redhat dot com   |decimal at us dot ibm dot
                   |                            |com
             Status|NEW                         |ASSIGNED


http://sourceware.org/bugzilla/show_bug.cgi?id=1780

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[Bug libc/1780] size of sigset_t in ucontext_t structure does not match linux kernel

[neleai at seznam dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=1780

--- Comment #7 from Ondrej Bilka <neleai at seznam dot cz> ---
As in other bug using kernel headers in user program is invalid, report that to
kernel.

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[Bug libc/1780] size of sigset_t in ucontext_t structure does not match linux kernel

[bugdal at aerifal dot cx]

https://sourceware.org/bugzilla/show_bug.cgi?id=1780

Rich Felker <bugdal at aerifal dot cx> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugdal at aerifal dot cx

--- Comment #6 from Rich Felker <bugdal at aerifal dot cx> ---
I don't think this bug is valid; if it is, it's probably not fixable. The
uc_sigmask member is required to have type sigset_t, both by POSIX and in order
to be useful, (passing it to functions which take sigset_t pointers must work)
so there's no way to change it.

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[Bug libc/1780] size of sigset_t in ucontext_t structure does not match linux kernel

[neleai at seznam dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=1780

Ondrej Bilka <neleai at seznam dot cz> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |NEW
                 CC|                            |neleai at seznam dot cz

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[Bug libc/1780] size of sigset_t in ucontext_t structure does not match linux kernel

[decimal at us dot ibm dot com]

------- Additional Comments From decimal at us dot ibm dot com  2005-12-16 22:29 -------
I confirmed it on FC4. So what is the value supposed to be? Is &__fpregs_mem
supposed to be the same as uc_mcontext.fpregs? (Been a while since I looked at
an x86 problem.) If this is a size mismatch bewteen the kernel and glibc should
glibc be responsible for reshaping the data? I guess I would have expected that
responsibility to belong to the kernel.

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[Bug libc/1780] size of sigset_t in ucontext_t structure does not match linux kernel

[decimal at us dot ibm dot com]

------- Additional Comments From decimal at us dot ibm dot com  2005-11-07 19:15 -------
Looking...

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[Bug libc/1780] size of sigset_t in ucontext_t structure does not match linux kernel

[naveen dot neelakantam at intel dot com]

------- Additional Comments From naveen dot neelakantam at intel dot com  2005-11-01 23:10 -------
Oh yeah, that's on i386

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[Bug libc/1780] size of sigset_t in ucontext_t structure does not match linux kernel

[naveen dot neelakantam at intel dot com]

------- Additional Comments From naveen dot neelakantam at intel dot com  2005-11-01 22:29 -------
Created an attachment (id=736)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=736&action=view)
Demonstrates symptom of sigset_t size bug


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