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dbd4af5474
https://bugs.linaro.org/show_bug.cgi?id=3782 Turns out arm doesn't permit mapping address 0, so try minimum virtual address instead. Link: http://lkml.kernel.org/r/20181113165446.GA28157@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Reported-by: Rafael David Tinoco <rafael.tinoco@linaro.org> Tested-by: Rafael David Tinoco <rafael.tinoco@linaro.org> Acked-by: Cyrill Gorcunov <gorcunov@gmail.com> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/*
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* Copyright © 2018 Alexey Dobriyan <adobriyan@gmail.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* Test readlink /proc/self/map_files/... with minimum address. */
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <stdlib.h>
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static void pass(const char *fmt, unsigned long a, unsigned long b)
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{
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char name[64];
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char buf[64];
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snprintf(name, sizeof(name), fmt, a, b);
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if (readlink(name, buf, sizeof(buf)) == -1)
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exit(1);
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}
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static void fail(const char *fmt, unsigned long a, unsigned long b)
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{
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char name[64];
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char buf[64];
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snprintf(name, sizeof(name), fmt, a, b);
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if (readlink(name, buf, sizeof(buf)) == -1 && errno == ENOENT)
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return;
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exit(1);
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}
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int main(void)
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{
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const unsigned int PAGE_SIZE = sysconf(_SC_PAGESIZE);
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#ifdef __arm__
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unsigned long va = 2 * PAGE_SIZE;
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#else
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unsigned long va = 0;
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#endif
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void *p;
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int fd;
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unsigned long a, b;
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fd = open("/dev/zero", O_RDONLY);
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if (fd == -1)
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return 1;
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p = mmap((void *)va, PAGE_SIZE, PROT_NONE, MAP_PRIVATE|MAP_FILE|MAP_FIXED, fd, 0);
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if (p == MAP_FAILED) {
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if (errno == EPERM)
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return 2;
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return 1;
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}
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a = (unsigned long)p;
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b = (unsigned long)p + PAGE_SIZE;
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pass("/proc/self/map_files/%lx-%lx", a, b);
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fail("/proc/self/map_files/ %lx-%lx", a, b);
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fail("/proc/self/map_files/%lx -%lx", a, b);
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fail("/proc/self/map_files/%lx- %lx", a, b);
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fail("/proc/self/map_files/%lx-%lx ", a, b);
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fail("/proc/self/map_files/0%lx-%lx", a, b);
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fail("/proc/self/map_files/%lx-0%lx", a, b);
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if (sizeof(long) == 4) {
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fail("/proc/self/map_files/100000000%lx-%lx", a, b);
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fail("/proc/self/map_files/%lx-100000000%lx", a, b);
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} else if (sizeof(long) == 8) {
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fail("/proc/self/map_files/10000000000000000%lx-%lx", a, b);
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fail("/proc/self/map_files/%lx-10000000000000000%lx", a, b);
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} else
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return 1;
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return 0;
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}
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