x86/mpx: Correctly report do_mpx_bt_fault() failures to user-space
When this function fails it just sends a SIGSEGV signal to
user-space using force_sig(). This signal is missing
essential information about the cause, e.g. the trap_nr or
an error code.
Fix this by propagating the error to the only caller of
mpx_handle_bd_fault(), do_bounds(), which sends the correct
SIGSEGV signal to the process.
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: fe3d197f84
('x86, mpx: On-demand kernel allocation of bounds tables')
Link: http://lkml.kernel.org/r/1491488362-27198-1-git-send-email-joro@8bytes.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
parent
e5185a76a2
commit
5ed386ec09
|
@ -526,15 +526,7 @@ int mpx_handle_bd_fault(void)
|
|||
if (!kernel_managing_mpx_tables(current->mm))
|
||||
return -EINVAL;
|
||||
|
||||
if (do_mpx_bt_fault()) {
|
||||
force_sig(SIGSEGV, current);
|
||||
/*
|
||||
* The force_sig() is essentially "handling" this
|
||||
* exception, so we do not pass up the error
|
||||
* from do_mpx_bt_fault().
|
||||
*/
|
||||
}
|
||||
return 0;
|
||||
return do_mpx_bt_fault();
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
Loading…
Reference in a new issue