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https://github.com/privatevoid-net/nix-super.git
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6fa3656a32
Also clean up some more linux-specific (`setPersonality`) code in alignment with recent best practices.
41 lines
1.3 KiB
C++
41 lines
1.3 KiB
C++
#include "personality.hh"
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#include "globals.hh"
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#include <sys/utsname.h>
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#include <sys/personality.h>
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#include <cstring>
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namespace nix::linux {
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void setPersonality(std::string_view system)
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{
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/* Change the personality to 32-bit if we're doing an
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i686-linux build on an x86_64-linux machine. */
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struct utsname utsbuf;
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uname(&utsbuf);
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if ((system == "i686-linux"
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&& (std::string_view(SYSTEM) == "x86_64-linux"
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|| (!strcmp(utsbuf.sysname, "Linux") && !strcmp(utsbuf.machine, "x86_64"))))
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|| system == "armv7l-linux"
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|| system == "armv6l-linux"
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|| system == "armv5tel-linux")
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{
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if (personality(PER_LINUX32) == -1)
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throw SysError("cannot set 32-bit personality");
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}
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/* Impersonate a Linux 2.6 machine to get some determinism in
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builds that depend on the kernel version. */
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if ((system == "i686-linux" || system == "x86_64-linux") && settings.impersonateLinux26) {
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int cur = personality(0xffffffff);
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if (cur != -1) personality(cur | 0x0020000 /* == UNAME26 */);
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}
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/* Disable address space randomization for improved
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determinism. */
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int cur = personality(0xffffffff);
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if (cur != -1) personality(cur | ADDR_NO_RANDOMIZE);
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}
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}
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