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i386: new stub strategy to avoid problems with early mmap layout

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The stub occupies the same region that execve() would create
for the original progam.  The stub copies everything to a new area,
erases the original region, replaces it with the de-compressed
program, and erases the copy of itself via the escape hatch.
The copy is inexpensive via mmap() of /proc/self/exe.

	modified:   stub/src/i386-linux.elf-entry.S
	modified:   stub/src/i386-linux.elf-fold.S
	modified:   stub/src/i386-linux.elf-main.c

	modified:   p_lx_elf.cpp
	modified:   p_lx_elf.h
	modified:   p_lx_interp.cpp
	modified:   p_lx_interp.h
	modified:   p_lx_sh.cpp
	modified:   p_lx_sh.h
	modified:   p_mach.cpp
	modified:   p_mach.h
	modified:   p_unix.cpp
	modified:   p_unix.h
	modified:   p_vmlinx.cpp

	plus .h, .map, .dump
This commit is contained in:
John Reiser
2017-10-01 15:56:34 -07:00
parent 26be845563
commit 9e8de4abe5
30 changed files with 2943 additions and 3118 deletions
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src/p_lx_interp.cpp
+2 -1
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@@ -135,7 +135,7 @@ int PackLinuxElf32x86interp::pack2(OutputFile *fo, Filter &ft)
#undef PAGE_MASK
#define PAGE_MASK (~0u<<12)
void PackLinuxElf32x86interp::pack3(OutputFile *fo, Filter &/*ft*/)
off_t PackLinuxElf32x86interp::pack3(OutputFile *fo, Filter &/*ft*/)
{
unsigned base = getbase(phdri, ehdri.e_phnum);
unsigned sz = PAGE_MASK & (~PAGE_MASK + elfout.phdr[0].p_filesz);
@@ -191,6 +191,7 @@ void PackLinuxElf32x86interp::pack3(OutputFile *fo, Filter &/*ft*/)
else {
updateLoader(fo);
}
return fo->getBytesWritten();
}