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Android 64-bit ARM shared library stub: use 4Ki page size until more is known

Browse Source 
https://github.com/upx/upx/issues/124
	modified:   p_lx_elf.cpp
	modified:   stub/arm64-linux.shlib-init.h
	modified:   stub/src/arm64-linux.shlib-init.S
	modified:   stub/tmp/arm64-linux.shlib-init.bin.dump
This commit is contained in:
John Reiser 2017-12-08 20:05:21 -08:00
parent e633c51b50
commit 7c21c4513e
4 changed files with 598 additions and 544 deletions
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9
src/p_lx_elf.cpp
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@ -586,6 +586,15 @@ PackLinuxElf::addStubEntrySections(Filter const *)
addLoader("ELFMAINZe", NULL);
}
addLoader("+40,ELFMAINZ", NULL);
if (hasLoaderSection("ANDMAJNZ")) { // Android trouble with args to DT_INIT
if (opt->o_unix.android_shlib) {
addLoader("ANDMAJNZ", NULL); // constant PAGE_SIZE
}
else {
addLoader("ELFMAJNZ", NULL); // PAGE_SIZE from AT_PAGESZ
}
addLoader("ELFMAKNZ", NULL);
}
if (hasLoaderSection("ELFMAINZu")) {
addLoader("ELFMAINZu", NULL);
}

1056
src/stub/arm64-linux.shlib-init.h
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File diff suppressed because it is too large Load Diff

45
src/stub/src/arm64-linux.shlib-init.S
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@ -136,22 +136,11 @@ _start: .globl _start
// brk #0 // debugging
stp arg1,arg2,[sp,#f_argc - sp_frame]! // f_argv
stp arg3,x0, [sp,#f_envp] // %f_uinit
// Calculate PAGE_MASK
0: // Advance envp to auxp
ldr x3,[arg3],#NBPW; cbnz x3,0b
mov x3,#1<<PAGE_SHIFT // default
0: // Find AT_PAGESZ
ldp x0,x1,[arg3],#2*NBPW; cbz x0,5f // AT_NULL==.a_type; use default
cmp x0,#AT_PAGESZ; bne 0b
5: // auxp cannot be empty (must have AT_UID), so 'cmp' above sets nzvc
csel x1,x1,x3,eq // x1 if found, else x3
neg x1,x1
stp x1,lr,[sp,#f_PMASK] // f_my_ra
str lr, [sp,#f_my_ra]
bl main // ra= &f_decompress
f_decompress:
#define LINUX_ARM_CACHEFLUSH 1
section NRV_HEAD
@ -187,10 +176,27 @@ L71:
/* IDENTSTR goes here */
section ELFMAINZ
#define lodsl ldr eax,[rsi],#4
#define lodslu lodsl
main:
section ELFMAJNZ
// Calculate PAGE_MASK
0: // Advance envp to auxp
ldr x3,[arg3],#NBPW; cbnz x3,0b
mov x3,#1<<PAGE_SHIFT // default
0: // Find AT_PAGESZ
ldp x0,x1,[arg3],#2*NBPW; cbz x0,5f // AT_NULL==.a_type; use default
cmp x0,#AT_PAGESZ; bne 0b
5: // auxp cannot be empty (must have AT_UID), so 'cmp' above sets nzvc
csel x1,x1,x3,eq // x1 if found, else x3
neg x1,x1
section ANDMAJNZ // Android passes junk args to DT_INIT?
mov x1,#~0<<12 // -4096
section ELFMAKNZ
str x1,[sp,#f_PMASK]
// 1. allocate temporary pages
// 2. copy to temporary pages:
// fragment of page below dst; compressed src;
@ -206,9 +212,12 @@ main:
// 11. unmap temporary pages
// 12. goto user DT_INIT
mov rdx,lr // &f_decompress
mov rdx,lr // &f_decompress
add rsi,rdx,# _start - f_decompress - 4*4
#define lodsl ldr eax,[rsi],#4
#define lodslu lodsl
mov rcx,rsi
lodsl; sub rcx,rcx,rax; //str ecx,[sp,#o_reloc]
lodsl; add rax,rcx,rax; str rax,[sp,#f_uinit] // reloc DT_INIT for step 12

32
src/stub/tmp/arm64-linux.shlib-init.bin.dump
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@ -2,18 +2,21 @@ file format elf64-littleaarch64
Sections:
Idx Name Size VMA LMA File off Algn Flags
0 ELFMAINX 00000034 0000000000000000 0000000000000000 00000040 2**0 CONTENTS, RELOC, READONLY
1 NRV_HEAD 00000000 0000000000000000 0000000000000000 00000074 2**0 CONTENTS, READONLY
2 NRV_TAIL 00000000 0000000000000000 0000000000000000 00000074 2**0 CONTENTS, READONLY
3 NRV2E 00000128 0000000000000000 0000000000000000 00000074 2**0 CONTENTS, READONLY
4 NRV2D 0000011c 0000000000000000 0000000000000000 0000019c 2**0 CONTENTS, READONLY
5 NRV2B 000000f0 0000000000000000 0000000000000000 000002b8 2**0 CONTENTS, READONLY
6 LZMA_ELF00 000000d0 0000000000000000 0000000000000000 000003a8 2**0 CONTENTS, RELOC, READONLY
7 LZMA_DEC20 00000968 0000000000000000 0000000000000000 00000478 2**0 CONTENTS, READONLY
8 LZMA_DEC10 0000049c 0000000000000000 0000000000000000 00000de0 2**0 CONTENTS, READONLY
9 LZMA_DEC30 00000000 0000000000000000 0000000000000000 0000127c 2**0 CONTENTS, READONLY
10 ELFMAINY 0000003e 0000000000000000 0000000000000000 0000127c 2**0 CONTENTS, READONLY
11 ELFMAINZ 0000028c 0000000000000000 0000000000000000 000012ba 2**0 CONTENTS, READONLY
0 ELFMAINX 00000010 0000000000000000 0000000000000000 00000040 2**0 CONTENTS, RELOC, READONLY
1 NRV_HEAD 00000000 0000000000000000 0000000000000000 00000050 2**0 CONTENTS, READONLY
2 NRV_TAIL 00000000 0000000000000000 0000000000000000 00000050 2**0 CONTENTS, READONLY
3 NRV2E 00000128 0000000000000000 0000000000000000 00000050 2**0 CONTENTS, READONLY
4 NRV2D 0000011c 0000000000000000 0000000000000000 00000178 2**0 CONTENTS, READONLY
5 NRV2B 000000f0 0000000000000000 0000000000000000 00000294 2**0 CONTENTS, READONLY
6 LZMA_ELF00 000000d0 0000000000000000 0000000000000000 00000384 2**0 CONTENTS, RELOC, READONLY
7 LZMA_DEC20 00000968 0000000000000000 0000000000000000 00000454 2**0 CONTENTS, READONLY
8 LZMA_DEC10 0000049c 0000000000000000 0000000000000000 00000dbc 2**0 CONTENTS, READONLY
9 LZMA_DEC30 00000000 0000000000000000 0000000000000000 00001258 2**0 CONTENTS, READONLY
10 ELFMAINY 0000003e 0000000000000000 0000000000000000 00001258 2**0 CONTENTS, READONLY
11 ELFMAINZ 00000000 0000000000000000 0000000000000000 00001296 2**0 CONTENTS, READONLY
12 ELFMAJNZ 00000024 0000000000000000 0000000000000000 00001296 2**0 CONTENTS, READONLY
13 ANDMAJNZ 00000004 0000000000000000 0000000000000000 000012ba 2**0 CONTENTS, READONLY
14 ELFMAKNZ 00000290 0000000000000000 0000000000000000 000012be 2**0 CONTENTS, READONLY
SYMBOL TABLE:
0000000000000000 l d LZMA_DEC30 0000000000000000 LZMA_DEC30
0000000000000000 l d ELFMAINZ 0000000000000000 ELFMAINZ
@ -27,6 +30,9 @@ SYMBOL TABLE:
0000000000000000 l d LZMA_DEC20 0000000000000000 LZMA_DEC20
0000000000000000 l d LZMA_DEC10 0000000000000000 LZMA_DEC10
0000000000000000 l d ELFMAINY 0000000000000000 ELFMAINY
0000000000000000 l d ELFMAJNZ 0000000000000000 ELFMAJNZ
0000000000000000 l d ANDMAJNZ 0000000000000000 ANDMAJNZ
0000000000000000 l d ELFMAKNZ 0000000000000000 ELFMAKNZ
0000000000000000 g ELFMAINX 0000000000000000 _start
0000000000000000 g F NRV2E 0000000000000128 ucl_nrv2e_decompress_32
0000000000000000 g F NRV2D 000000000000011c ucl_nrv2d_decompress_32
@ -36,7 +42,7 @@ SYMBOL TABLE:
RELOCATION RECORDS FOR [ELFMAINX]:
OFFSET TYPE VALUE
0000000000000030 R_AARCH64_CALL26 ELFMAINZ
000000000000000c R_AARCH64_CALL26 ELFMAINZ
RELOCATION RECORDS FOR [LZMA_ELF00]:
OFFSET TYPE VALUE