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Always enable pointer guard [BZ #18928]

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Honoring the LD_POINTER_GUARD environment variable in AT_SECURE mode
has security implications.  This commit enables pointer guard
unconditionally, and the environment variable is now ignored.

        [BZ #18928]
        * sysdeps/generic/ldsodefs.h (struct rtld_global_ro): Remove
        _dl_pointer_guard member.
        * elf/rtld.c (_rtld_global_ro): Remove _dl_pointer_guard
        initializer.
        (security_init): Always set up pointer guard.
        (process_envvars): Do not process LD_POINTER_GUARD.
This commit is contained in:
Florian Weimer
2015-10-15 09:23:07 +02:00
parent 0c25f5b5bb
commit a014cecd82
4 changed files with 22 additions and 19 deletions
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3
sysdeps/generic/ldsodefs.h
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@ -592,9 +592,6 @@ struct rtld_global_ro
/* List of auditing interfaces. */
struct audit_ifaces *_dl_audit;
unsigned int _dl_naudit;
/* 0 if internal pointer values should not be guarded, 1 if they should. */
EXTERN int _dl_pointer_guard;
};
# define __rtld_global_attribute__
# if IS_IN (rtld)