vim-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: vim/vim#13621

https://github.com/vim/vim/commit/5dd41d4b6370b7b7d09d691f9252b3899c66102a

Co-authored-by: Christian Brabandt <cb@256bit.org>

2 files changed, 25 insertions, 14 deletions

diff --git a/test/old/testdir/crash/poc_uaf_exec_instructions b/test/old/testdir/crash/poc_uaf_exec_instructions
new file mode 100644
index 0000000000..49ae8577ff
--- /dev/null
+++ b/test/old/testdir/crash/poc_uaf_exec_instructions
diff --git a/test/old/testdir/test_crash.vim b/test/old/testdir/test_crash.vim
index 49e712a901..242da8e5db 100644
--- a/test/old/testdir/test_crash.vim
+++ b/test/old/testdir/test_crash.vim
@@ -113,6 +113,7 @@ endfunc
 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 @@ func Test_crash1_2()
     \ ' ; 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 @@ func Test_crash1_2()
 
   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}