kern.elf{32,64}.pie_base sysctl: enforce page alignment.
Requested by: rstone Sponsored by: The FreeBSD Foundation MFC after: 1 week
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parent
2b28ec59ac
commit
f33533da8c
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=352585
@ -136,8 +136,24 @@ SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0,
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#endif
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static u_long __elfN(pie_base) = ET_DYN_LOAD_ADDR;
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SYSCTL_ULONG(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, pie_base,
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CTLFLAG_RWTUN, &__elfN(pie_base), 0,
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static int
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sysctl_pie_base(SYSCTL_HANDLER_ARGS)
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{
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u_long val;
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int error;
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val = __elfN(pie_base);
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error = sysctl_handle_long(oidp, &val, 0, req);
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if (error != 0 || req->newptr == NULL)
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return (error);
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if ((val & PAGE_MASK) != 0)
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return (EINVAL);
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__elfN(pie_base) = val;
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return (0);
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}
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SYSCTL_PROC(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, pie_base,
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CTLTYPE_ULONG | CTLFLAG_MPSAFE | CTLFLAG_RW, NULL, 0,
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sysctl_pie_base, "LU",
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"PIE load base without randomization");
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SYSCTL_NODE(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO, aslr, CTLFLAG_RW, 0,
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