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1c6c4d112e
The hidepid parameter values are becoming more and more and it becomes difficult to remember what each new magic number means. Backward compatibility is preserved since it is possible to specify numerical value for the hidepid parameter. This does not break the fsconfig since it is not possible to specify a numerical value through it. All numeric values are converted to a string. The type FSCONFIG_SET_BINARY cannot be used to indicate a numerical value. Selftest has been added to verify this behavior. Suggested-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Alexey Gladkov <gladkov.alexey@gmail.com> Reviewed-by: Alexey Dobriyan <adobriyan@gmail.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/*
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* Copyright © 2020 Alexey Gladkov <gladkov.alexey@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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#include <assert.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <linux/mount.h>
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#include <linux/unistd.h>
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static inline int fsopen(const char *fsname, unsigned int flags)
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{
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return syscall(__NR_fsopen, fsname, flags);
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}
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static inline int fsconfig(int fd, unsigned int cmd, const char *key, const void *val, int aux)
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{
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return syscall(__NR_fsconfig, fd, cmd, key, val, aux);
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}
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int main(void)
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{
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int fsfd, ret;
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int hidepid = 2;
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assert((fsfd = fsopen("proc", 0)) != -1);
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ret = fsconfig(fsfd, FSCONFIG_SET_BINARY, "hidepid", &hidepid, 0);
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assert(ret == -1);
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assert(errno == EINVAL);
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assert(!fsconfig(fsfd, FSCONFIG_SET_STRING, "hidepid", "2", 0));
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assert(!fsconfig(fsfd, FSCONFIG_SET_STRING, "hidepid", "invisible", 0));
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assert(!close(fsfd));
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return 0;
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}
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