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56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
/* longjmp fortify implementation. Linux version.
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Copyright (C) 2011-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <jmpbuf-offsets.h>
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#include <sysdep.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stackinfo.h>
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#ifdef _STACK_GROWS_DOWN
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#define called_from(this, saved) ((this) < (saved))
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#else
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#define called_from(this, saved) ((this) > (saved))
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#endif
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_Noreturn extern void ____longjmp_chk (__jmp_buf __env, int __val);
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void ____longjmp_chk (__jmp_buf env, int val)
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{
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void *this_frame = __builtin_frame_address (0);
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void *saved_frame = JB_FRAME_ADDRESS (env);
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stack_t ss;
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/* If "env" is from a frame that called us, we're all set. */
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if (called_from(this_frame, saved_frame))
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__longjmp (env, val);
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/* If we can't get the current stack state, give up and do the longjmp. */
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if (INTERNAL_SYSCALL_CALL (sigaltstack, NULL, &ss) != 0)
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__longjmp (env, val);
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/* If we we are executing on the alternate stack and within the
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bounds, do the longjmp. */
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if (ss.ss_flags == SS_ONSTACK
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&& (this_frame >= ss.ss_sp && this_frame < (ss.ss_sp + ss.ss_size)))
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__longjmp (env, val);
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__fortify_fail ("longjmp causes uninitialized stack frame");
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}
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