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/proc/self/exe mapping had wrong offset in stub for 32-bit ARM

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https://github.com/upx/upx/issues/221
	modified:   stub/src/arm.v4a-linux.elf-entry.S
	modified:   stub/src/arm.v4a-linux.elf-fold.S
	also arm*.*-linux.elf-*.{h,map}
This commit is contained in:
John Reiser 2018-09-23 20:32:37 -07:00
parent 4d1c754af9
commit 4f0cba9bb6
2 changed files with 6 additions and 5 deletions
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4
src/stub/src/arm.v4a-linux.elf-entry.S
View File

@ -124,9 +124,9 @@ end_decompress: .globl end_decompress
/* IDENTSTR goes here */
section ELFMAINZ
unfold: // in: r3= mflg; lr= &O_BINFO
unfold: // in: r3= mflg; r6= elfaddr; lr= &O_BINFO
str r3,[sp,#F_mflg]
mvn r10,r6; add r10,r10,#1 @ "neg r10,r6": -elfaddr
mov r10,#0; sub r10,r10,r6 @ "neg r10,r6": -elfaddr
add r6,lr,#4 @ &b_info of folded code
add r14,r6,r10 @ offset(b_info)

7
src/stub/src/arm.v4a-linux.elf-fold.S
View File

@ -182,14 +182,15 @@ F_delta= 3*4
str r0,[sp,#F_entry - F_delta] @ entry address
// Map 1 page of /proc/self/exe so that it does not disappear
mov r5,#0 @ SEEK_SET
ldr r4,[sp,#F_fd - F_delta]! @ fd
ldr r4,[sp],#4 @ pop r4,F_fd
mov r5,#0 @ SEEK_SET offset
stmdb sp!,{r4,r5} @ arg5,arg6 calling convention
mov r3,#MAP_PRIVATE
mov r2,#PROT_READ
mov r1,#PAGE_SIZE
mov r0,#0 @ any address
bl mmap @ no error check: cannot recover
ldr r0,[sp],#4 @ F_fd
ldmia sp!,{r0,r1} @ fd, offset
bl close
#if DEBUG //{