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i386-linux stub: Use current __NR_uname; pacify memcheck

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modified:   stub/src/i386-linux.elf-entry.S
	modified:   stub/src/i386-linux.elf-fold.S
This commit is contained in:
John Reiser 2024-07-31 09:25:12 -07:00
parent 620ddf1228
commit 055e3db80a
2 changed files with 10 additions and 2 deletions
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10
src/stub/src/i386-linux.elf-entry.S
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@ -177,6 +177,14 @@ AT_PAGESZ= 6 // /usr/include/elf.h
sub u_len,%esp // alloca
and $-2*NBPW,%esp // align stack
push %edi // save
lea NBPW(%esp,r_unc),%edi // after unfolded code
mov old_sp,%ecx
sub %edi,%ecx
mov $0xa5,%al
rep stosb // memcheck defense
pop %edi // restore
lea (2*NBPW + D_FOLD)(r_unc),%eax; add %esp,%eax
and $-2*NBPW,%eax; push %eax // MATCH_31 where to put pathname
mov %eax,%ecx
@ -357,7 +365,7 @@ uname: .globl uname
push %ebp; mov %esp,%ebp
push %ebx
mov 2*NBPW(%ebp),%ebx
push $__NR_olduname; pop %eax; int $0x80
push $__NR_uname; pop %eax; int $0x80
pop %ebx; pop %ebp
ret

2
src/stub/src/i386-linux.elf-fold.S
View File

@ -334,7 +334,7 @@ uname: .globl uname
mov %ebp,%esp
push %ebx
mov %ebx, [2*NBPW + %ebp]
push __NR_olduname; pop %eax; int 0x80
push __NR_uname; pop %eax; int 0x80
pop %ebx; pop %ebp
ret