For old mmap syscall, when executing on amd64 or ia64, enforce the
PROT_EXEC if prot is non-zero, process is 32bit and kern.elf32.i386_read_exec syscal is enabled. This workaround is needed for old i386 a.out binaries, where dynamic linker did not specified PROT_EXEC for mapping of the text. The kern.elf32.i386_read_exec MIB name looks weird for a.out binaries, but I reused the existing knob which already has the needed semantic. MFC after: 1 week
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=239250
@ -453,6 +453,13 @@ ommap(td, uap)
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nargs.addr = uap->addr;
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nargs.len = uap->len;
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nargs.prot = cvtbsdprot[uap->prot & 0x7];
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#ifdef COMPAT_FREEBSD32
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#if defined(__amd64__) || defined(__ia64__)
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if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32) &&
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nargs.prot != 0)
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nargs.prot |= PROT_EXEC;
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#endif
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#endif
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nargs.flags = 0;
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if (uap->flags & OMAP_ANON)
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nargs.flags |= MAP_ANON;
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