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Alejandro Vallejo
990e65c3ad
This is work required in order to let pygrub operate in highly deprivileged chroot mode. This patch adds a function that preloads every plugin, hence ensuring that a on function exit, every shared library is loaded in memory. The new "init" function is supposed to be used before depriv, but that's fine because it's not acting on untrusted data. This is part of XSA-443 / CVE-2023-34325 Signed-off-by: Alejandro Vallejo <alejandro.vallejo@cloud.com>
65 lines
2.1 KiB
C
65 lines
2.1 KiB
C
/*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#ifndef _FSIMAGE_H
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#define _FSIMAGE_H
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#ifdef __cplusplus
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extern C {
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#endif
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#include <sys/types.h>
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#include <stdint.h>
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#include <unistd.h>
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typedef struct fsi fsi_t;
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typedef struct fsi_file fsi_file_t;
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/*
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* Optional initialization function. If invoked it loads the associated
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* dynamic libraries for the backends ahead of time. This is required if
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* the library is to run as part of a highly deprivileged executable, as
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* the libraries may not be reachable after depriv.
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*/
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int fsi_init(void);
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fsi_t *fsi_open_fsimage(const char *, uint64_t, const char *);
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void fsi_close_fsimage(fsi_t *);
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int fsi_file_exists(fsi_t *, const char *);
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fsi_file_t *fsi_open_file(fsi_t *, const char *);
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int fsi_close_file(fsi_file_t *);
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ssize_t fsi_read_file(fsi_file_t *, void *, size_t);
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ssize_t fsi_pread_file(fsi_file_t *, void *, size_t, uint64_t);
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char *fsi_bootstring_alloc(fsi_t *, size_t);
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void fsi_bootstring_free(fsi_t *);
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char *fsi_fs_bootstring(fsi_t *);
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#ifdef __cplusplus
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};
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#endif
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#endif /* _FSIMAGE_H */
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