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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_elf.h
+3 -5
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@@ -51,7 +51,7 @@ protected:
virtual void pack1(OutputFile *, Filter &) = 0; // generate executable header
virtual int pack2(OutputFile *, Filter &) = 0; // append compressed data
virtual void pack3(OutputFile *, Filter &) = 0; // append loader
virtual off_t pack3(OutputFile *, Filter &) = 0; // append loader
//virtual void pack4(OutputFile *, Filter &) = 0; // append pack header
virtual void generateElfHdr(
@@ -119,7 +119,7 @@ protected:
virtual void pack1(OutputFile *, Filter &); // generate executable header
virtual int pack2(OutputFile *, Filter &); // append compressed data
virtual void pack3(OutputFile *, Filter &); // append loader
virtual off_t pack3(OutputFile *, Filter &); // append loader
virtual void pack4(OutputFile *, Filter &); // append pack header
virtual void unpack(OutputFile *fo);
@@ -243,7 +243,7 @@ protected:
virtual void pack1(OutputFile *, Filter &); // generate executable header
virtual int pack2(OutputFile *, Filter &); // append compressed data
virtual void pack3(OutputFile *, Filter &); // append loader
virtual off_t pack3(OutputFile *, Filter &); // append loader
virtual void pack4(OutputFile *, Filter &); // append pack header
virtual void unpack(OutputFile *fo);
@@ -404,7 +404,6 @@ public:
virtual const int *getFilters() const;
protected:
virtual void pack1(OutputFile *, Filter &); // generate executable header
//virtual void pack3(OutputFile *, Filter &); // append loader
virtual void buildLoader(const Filter *);
virtual Linker* newLinker() const;
virtual void defineSymbols(Filter const *);
@@ -422,7 +421,6 @@ public:
virtual const int *getFilters() const;
protected:
virtual void pack1(OutputFile *, Filter &); // generate executable header
//virtual void pack3(OutputFile *, Filter &); // append loader
virtual void buildLoader(const Filter *);
virtual Linker* newLinker() const;
virtual void defineSymbols(Filter const *);