patch 9.0.2149: [security]: use-after-free in exec_instructions()
Problem: [security]: use-after-free in exec_instructions()
Solution: get tv pointer again
[security]: use-after-free in exec_instructions()
exec_instructions may access freed memory, if the GA_GROWS_FAILS()
re-allocates memory. When this happens, the typval tv may still point to
now already freed memory. So let's get that pointer again and compare it
with tv. If those two pointers differ, tv is now invalid and we have to
refresh the tv pointer.
closes: #13621
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/crash/poc_uaf_exec_instructions b/src/testdir/crash/poc_uaf_exec_instructions
new file mode 100644
index 0000000..49ae857
--- /dev/null
+++ b/src/testdir/crash/poc_uaf_exec_instructions
Binary files differ
diff --git a/src/testdir/test_crash.vim b/src/testdir/test_crash.vim
index 49e712a..242da8e 100644
--- a/src/testdir/test_crash.vim
+++ b/src/testdir/test_crash.vim
@@ -113,6 +113,7 @@
func Test_crash1_2()
CheckNotBSD
CheckExecutable dash
+ let g:test_is_flaky = 1
" The following used to crash Vim
let opts = #{cmd: 'sh'}
@@ -149,22 +150,9 @@
\ ' ; echo "crash 4: [OK]" >> '.. result .. "\<cr>")
call TermWait(buf, 150)
- let file = 'crash/poc_ex_substitute'
- let cmn_args = "%s -u NONE -i NONE -n -e -s -S %s -c ':qa!'"
- let args = printf(cmn_args, vim, file)
- " just make sure it runs, we don't care about the resulting echo
- call term_sendkeys(buf, args .. "\<cr>")
- " There is no output generated in Github CI for the asan clang build.
- " so just skip generating the ouput.
- " call term_sendkeys(buf, args ..
- " \ ' && echo "crash 5: [OK]" >> '.. result .. "\<cr>")
- call TermWait(buf, 150)
-
" clean up
exe buf .. "bw!"
-
exe "sp " .. result
-
let expected = [
\ 'crash 1: [OK]',
\ 'crash 2: [OK]',
@@ -174,10 +162,33 @@
call assert_equal(expected, getline(1, '$'))
bw!
-
call delete(result)
endfunc
+" This test just runs various scripts, that caused issues before.
+" We are not really asserting anything here, it's just important
+" that ASAN does not detect any issues.
+func Test_crash1_3()
+ let vim = GetVimProg()
+ let buf = RunVimInTerminal('sh', #{cmd: 'sh'})
+
+ let file = 'crash/poc_ex_substitute'
+ let cmn_args = "%s -u NONE -i NONE -n -e -s -S %s -c ':qa!'\<cr>"
+ let args = printf(cmn_args, vim, file)
+ call term_sendkeys(buf, args)
+ call TermWait(buf, 150)
+
+ let file = 'crash/poc_uaf_exec_instructions'
+ let cmn_args = "%s -u NONE -i NONE -n -e -s -S %s -c ':qa!'\<cr>"
+ let args = printf(cmn_args, vim, file)
+ call term_sendkeys(buf, args)
+ call TermWait(buf, 150)
+
+ " clean up
+ exe buf .. "bw!"
+ bw!
+endfunc
+
func Test_crash2()
" The following used to crash Vim
let opts = #{wait_for_ruler: 0, rows: 20}
diff --git a/src/version.c b/src/version.c
index 2c09227..064b813 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
static int included_patches[] =
{ /* Add new patch number below this line */
/**/
+ 2149,
+/**/
2148,
/**/
2147,
diff --git a/src/vim9execute.c b/src/vim9execute.c
index e329559..44cdb09 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -4123,8 +4123,22 @@
+ iptr->isn_arg.outer.outer_idx;
if (iptr->isn_type == ISN_LOADOUTER)
{
+ typval_T *copy;
if (GA_GROW_FAILS(&ectx->ec_stack, 1))
goto theend;
+ // careful: ga_grow_inner may re-alloc the stack
+ if (depth < 0)
+ copy = ((typval_T *)outer->out_loop[-depth - 1]
+ .stack->ga_data)
+ + outer->out_loop[-depth - 1].var_idx
+ + iptr->isn_arg.outer.outer_idx;
+ else
+ copy = ((typval_T *)outer->out_stack->ga_data)
+ + outer->out_frame_idx + STACK_FRAME_SIZE
+ + iptr->isn_arg.outer.outer_idx;
+ // memory was freed, get tv again
+ if (copy != tv)
+ tv = copy;
copy_tv(tv, STACK_TV_BOT(0));
++ectx->ec_stack.ga_len;
}