vasilito
068a1ca63e
Bootloader fork rebase:
- Base changed from 0.1.0 pre-patched archive to upstream 1.0.0 tag (c7eeb9f)
- Applied 0001-redbear-local-forks.patch (Cargo.toml crate path redirects)
- Applied fix-uefi-alloc-panic.patch equivalents (4 panic!() -> graceful
error handling in src/main.rs)
- Applied P5-live-preload-cap-1gib.patch (1 GiB cap on live image preload)
- Skipped: P0 GPT partition scan (requires new module + integration),
P1 timeout/default-resolution, P2 live preload guard (subsumed by
panic fixes + cap), P3 live image safe read, P4 large ISO boot,
redox.patch — to be applied in dedicated rebase session.
firmware-loader/Cargo.toml: version 0.1.0 -> 0.3.0 (sync with other
Red Bear custom crates which are at 0.3.0).
fork-upstream-map.toml: bootloader back from PENDING_REBASE to 1.0.0
since the partial rebase matches upstream 1.0.0 content.
fork-upstream-map.toml: base restored to 'main' tracked (was correctly
tracked by build-redbear.sh).
131 lines
3.1 KiB
C
131 lines
3.1 KiB
C
/* Test that the handler is called, with the right fault address.
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Copyright (C) 2002-2025 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible. */
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#include <config.h>
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/* Specification. */
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#include "sigsegv.h"
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#include <stdint.h>
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#include <stdio.h>
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#if HAVE_SIGSEGV_RECOVERY
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# include "mmap-anon-util.h"
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# include <stdlib.h>
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# if SIGSEGV_FAULT_ADDRESS_ALIGNMENT > 1UL
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# include <unistd.h>
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# define SIGSEGV_FAULT_ADDRESS_ROUNDOFF_BITS (sysconf (_SC_PAGESIZE) - 1)
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# else
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# define SIGSEGV_FAULT_ADDRESS_ROUNDOFF_BITS 0
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# endif
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uintptr_t page;
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volatile int handler_called = 0;
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static int
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handler (void *fault_address, int serious)
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{
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handler_called++;
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if (handler_called > 10)
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abort ();
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if (fault_address
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!= (void *)((page + 0x678) & ~SIGSEGV_FAULT_ADDRESS_ROUNDOFF_BITS))
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abort ();
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if (mprotect ((void *) page, 0x4000, PROT_READ_WRITE) == 0)
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return 1;
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return 0;
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}
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static void
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crasher (uintptr_t p)
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{
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*(volatile int *) (p + 0x678) = 42;
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}
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int
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main ()
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{
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int prot_unwritable;
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void *p;
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/* Preparations. */
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# if !HAVE_MAP_ANONYMOUS
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zero_fd = open ("/dev/zero", O_RDONLY, 0644);
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# endif
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# if defined __linux__ && defined __sparc__
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/* On Linux 2.6.26/SPARC64, PROT_READ has the same effect as
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PROT_READ | PROT_WRITE. */
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prot_unwritable = PROT_NONE;
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# else
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prot_unwritable = PROT_READ;
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# endif
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/* Setup some mmapped memory. */
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p = mmap_zeromap ((void *) 0x12340000, 0x4000);
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if (p == (void *)(-1))
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{
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fprintf (stderr, "mmap_zeromap failed.\n");
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exit (2);
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}
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page = (uintptr_t) p;
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/* Make it read-only. */
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if (mprotect ((void *) page, 0x4000, prot_unwritable) < 0)
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{
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fprintf (stderr, "mprotect failed.\n");
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exit (2);
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}
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/* Test whether it's possible to make it read-write after it was read-only.
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This is not possible on Cygwin. */
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if (mprotect ((void *) page, 0x4000, PROT_READ_WRITE) < 0
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|| mprotect ((void *) page, 0x4000, prot_unwritable) < 0)
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{
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fprintf (stderr, "mprotect failed.\n");
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exit (2);
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}
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/* Install the SIGSEGV handler. */
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sigsegv_install_handler (&handler);
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/* The first write access should invoke the handler and then complete. */
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crasher (page);
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/* The second write access should not invoke the handler. */
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crasher (page);
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/* Check that the handler was called only once. */
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if (handler_called != 1)
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exit (1);
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/* Test passed! */
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printf ("Test passed.\n");
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return 0;
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}
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#else
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int
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main ()
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{
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return 77;
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}
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#endif
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