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Linux does not grow the stack below esp, so all accesses must be >= esp.

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fold_elf86.asm fold_sh86.asm l_lx_sep86.asm

committer: jreiser <jreiser> 1006463120 +0000
This commit is contained in:
John Reiser 2001-11-22 21:05:20 +00:00
parent 83bcbb8299
commit 2dfb82d5b9
3 changed files with 9 additions and 0 deletions
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3
src/stub/fold_elf86.asm
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@ -131,9 +131,12 @@ EXTERN make_hatch
%define N_STKCLR (0x100 + MAX_ELF_HDR + OVERHEAD)/4
lea edi, [esp - 4*N_STKCLR]
pusha ; values will be zeroed
mov esi,esp ; save
mov esp,edi ; Linux does not grow stack below esp
mov ecx, N_STKCLR
xor eax,eax
rep stosd
mov esp,esi ; restore
xor ecx, ecx ; 0
mov ch, PAGE_SIZE>>8 ; 0x1000

3
src/stub/fold_sh86.asm
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@ -141,9 +141,12 @@ EXTERN upx_main
%define N_STKCLR (0x100 + MAX_ELF_HDR + OVERHEAD)/4
lea edi, [esp - 4*N_STKCLR]
pusha ; values will be zeroed
mov ebx,esp ; save
mov esp,edi ; Linux does not grow stack below esp
mov ecx, N_STKCLR
xor eax,eax
rep stosd
mov esp,ebx ; restore
; Because the decompressed shell script occupies low memory anyway,
; there isn't much payback to unmapping the compressed script and

3
src/stub/l_lx_sep86.asm
View File

@ -234,9 +234,12 @@ EXTERN make_hatch
%define N_STKCLR (0x100 + MAX_ELF_HDR + OVERHEAD)/4
lea edi, [esp - 4*N_STKCLR]
pusha ; values will be zeroed
mov ebx,esp ; save
mov esp,edi ; Linux does not grow stack below esp
mov ecx, N_STKCLR
xor eax,eax
rep stosd
mov esp,ebx ; restore
mov ecx, dword -PAGE_SIZE
mov ebx, ebp