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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/stub/tmp/arm.v4a-linux.elf-fold.map
+8 -8
View File
@@ -9,7 +9,7 @@ Linker script and memory map
TARGET(elf32-littlearm)
0x0000000000008080 . = ((0x8000 + SIZEOF_HEADERS) + 0xc)
.text 0x0000000000008080 0x9f8
.text 0x0000000000008080 0x9dc
*(.text)
.text 0x0000000000008080 0x308 tmp/arm.v4a-linux.elf-fold.o
0x00000000000082dc munmap
@@ -29,18 +29,18 @@ TARGET(elf32-littlearm)
0x000000000000832c div10
0x00000000000082e4 mprotect
0x00000000000082b4 close
.text 0x0000000000008388 0x6f0 tmp/arm.v4a-linux.elf-main.o
.text 0x0000000000008388 0x6d4 tmp/arm.v4a-linux.elf-main.o
0x00000000000083a8 get_page_mask
0x0000000000008944 upx_main
0x000000000000891c upx_main
*(.data)
.data 0x0000000000008a78 0x0 tmp/arm.v4a-linux.elf-fold.o
.data 0x0000000000008a78 0x0 tmp/arm.v4a-linux.elf-main.o
.data 0x0000000000008a5c 0x0 tmp/arm.v4a-linux.elf-fold.o
.data 0x0000000000008a5c 0x0 tmp/arm.v4a-linux.elf-main.o
.data
.bss 0x0000000000008a78 0x0
.bss 0x0000000000008a78 0x0 tmp/arm.v4a-linux.elf-fold.o
.bss 0x0000000000008a78 0x0 tmp/arm.v4a-linux.elf-main.o
.bss 0x0000000000008a5c 0x0
.bss 0x0000000000008a5c 0x0 tmp/arm.v4a-linux.elf-fold.o
.bss 0x0000000000008a5c 0x0 tmp/arm.v4a-linux.elf-main.o
LOAD tmp/arm.v4a-linux.elf-fold.o
LOAD tmp/arm.v4a-linux.elf-main.o
OUTPUT(tmp/arm.v4a-linux.elf-fold.bin elf32-littlearm)