Add kern.elf{32,64}.vdso knobs to enable/disable vdso preloading
Reviewed by: emaste Discussed with: jrtc27 Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 month Differential revision: https://reviews.freebsd.org/D32960
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@ -129,6 +129,15 @@ SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
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nxstack, CTLFLAG_RW, &__elfN(nxstack), 0,
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__XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack");
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#if defined(__amd64__)
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static int __elfN(vdso) = 1;
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SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
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vdso, CTLFLAG_RWTUN, &__elfN(vdso), 0,
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__XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable vdso preloading");
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#else
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static int __elfN(vdso) = 0;
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#endif
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#if __ELF_WORD_SIZE == 32 && (defined(__amd64__) || defined(__i386__))
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int i386_read_exec = 0;
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SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0,
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@ -1414,7 +1423,7 @@ __elfN(freebsd_copyout_auxargs)(struct image_params *imgp, uintptr_t base)
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AUXARGS_ENTRY_PTR(pos, AT_PS_STRINGS, imgp->ps_strings);
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if (imgp->sysent->sv_fxrng_gen_base != 0)
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AUXARGS_ENTRY(pos, AT_FXRNG, imgp->sysent->sv_fxrng_gen_base);
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if (imgp->sysent->sv_vdso_base != 0)
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if (imgp->sysent->sv_vdso_base != 0 && __elfN(vdso) != 0)
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AUXARGS_ENTRY(pos, AT_KPRELOAD, imgp->sysent->sv_vdso_base);
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AUXARGS_ENTRY(pos, AT_NULL, 0);
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