Dmitry V. Levin
0297e0c067
Despite being marked as SYSCALL_NEVER_FAILS, personality syscall still might report a failure on some architectures due to obscure kernel bugs. Check for this unlikely case and let users know that their kernel has gone bananas. * personality.c (SYS_FUNC(personality)): Do not parse syscall return value in case of syserror.
70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/*
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* Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "defs.h"
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#include <linux/personality.h>
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#include "xlat/personality_types.h"
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#include "xlat/personality_flags.h"
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SYS_FUNC(personality)
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{
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unsigned int pers;
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if (entering(tcp)) {
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pers = tcp->u_arg[0];
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if (0xffffffff == pers) {
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tprints("0xffffffff");
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} else {
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printxval(personality_types, pers & PER_MASK, "PER_???");
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pers &= ~PER_MASK;
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if (pers) {
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tprints("|");
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printflags(personality_flags, pers, NULL);
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}
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}
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return 0;
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}
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if (syserror(tcp))
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return 0;
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pers = tcp->u_rval;
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const char *type = xlookup(personality_types, pers & PER_MASK);
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char *p;
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static char outstr[1024];
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if (type)
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p = stpcpy(outstr, type);
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else
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p = outstr + sprintf(outstr, "%#x /* %s */", pers & PER_MASK, "PER_???");
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pers &= ~PER_MASK;
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if (pers)
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strcpy(p, sprintflags("|", personality_flags, pers));
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tcp->auxstr = outstr;
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return RVAL_HEX | RVAL_STR;
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}
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