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authorMiguel Ojeda <ojeda@kernel.org>2023-07-09 01:33:44 +0200
committerAndrew Morton <akpm@linux-foundation.org>2023-07-17 12:53:21 -0700
commit636e348353a7cc52609fdba5ff3270065da140d5 (patch)
tree26b7f6b3bec5945bb83d922ec44356aed2f37862
parentf13be0ad5344b46bb89323ea5576a2417c6d1e55 (diff)
prctl: move PR_GET_AUXV out of PR_MCE_KILL
Somehow PR_GET_AUXV got added into PR_MCE_KILL's switch when the patch was applied [1]. Thus move it out of the switch, to the place the patch added it. In the recently released v6.4 kernel some user could, in principle, be already using this feature by mapping the right page and passing the PR_GET_AUXV constant as a pointer: prctl(PR_MCE_KILL, PR_GET_AUXV, ...) So this does change the behavior for users. We could keep the bug since the other subcases in PR_MCE_KILL (PR_MCE_KILL_CLEAR and PR_MCE_KILL_SET) do not overlap. However, v6.4 may be recent enough (2 weeks old) that moving the lines (rather than just adding a new case) does not break anybody? Moreover, the documentation in man-pages was just committed today [2]. Link: https://lkml.kernel.org/r/20230708233344.361854-1-ojeda@kernel.org Fixes: ddc65971bb67 ("prctl: add PR_GET_AUXV to copy auxv to userspace") Link: https://lore.kernel.org/all/d81864a7f7f43bca6afa2a09fc2e850e4050ab42.1680611394.git.josh@joshtriplett.org/ [1] Link: https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/commit/?id=8cf0c06bfd3c2b219b044d4151c96f0da50af9ad [2] Signed-off-by: Miguel Ojeda <ojeda@kernel.org> Cc: Josh Triplett <josh@joshtriplett.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
-rw-r--r--kernel/sys.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/kernel/sys.c b/kernel/sys.c
index 05f838929e72..2410e3999ebe 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -2535,11 +2535,6 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
else
return -EINVAL;
break;
- case PR_GET_AUXV:
- if (arg4 || arg5)
- return -EINVAL;
- error = prctl_get_auxv((void __user *)arg2, arg3);
- break;
default:
return -EINVAL;
}
@@ -2694,6 +2689,11 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
case PR_SET_VMA:
error = prctl_set_vma(arg2, arg3, arg4, arg5);
break;
+ case PR_GET_AUXV:
+ if (arg4 || arg5)
+ return -EINVAL;
+ error = prctl_get_auxv((void __user *)arg2, arg3);
+ break;
#ifdef CONFIG_KSM
case PR_SET_MEMORY_MERGE:
if (arg3 || arg4 || arg5)