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authorLinus Torvalds2016-08-22 16:41:46 -0700
committerLinus Torvalds2016-08-31 09:13:56 -0700
commit9f834ec18defc369d73ccf9e87a2790bfa05bf46 (patch)
tree5f70d5826dda2f6e59f7dc5a20ebb1e8278e26d3
parent61b5ebd6ffc3099618a2e79903e5ee0577c10799 (diff)
binfmt_elf: switch to new creds when switching to new mm
We used to delay switching to the new credentials until after we had mapped the executable (and possible elf interpreter). That was kind of odd to begin with, since the new executable will actually then _run_ with the new creds, but whatever. The bigger problem was that we also want to make sure that we turn off prof events and tracing before we start mapping the new executable state. So while this is a cleanup, it's also a fix for a possible information leak. Reported-by: Robert Święcki <robert@swiecki.net> Tested-by: Peter Zijlstra <peterz@infradead.org> Acked-by: David Howells <dhowells@redhat.com> Acked-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Andy Lutomirski <luto@amacapital.net> Acked-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Willy Tarreau <w@1wt.eu> Cc: Kees Cook <keescook@chromium.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/binfmt_elf.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 7f6aff3f72eb..e5495f37c6ed 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -853,6 +853,7 @@ static int load_elf_binary(struct linux_binprm *bprm)
current->flags |= PF_RANDOMIZE;
setup_new_exec(bprm);
+ install_exec_creds(bprm);
/* Do this so that we can load the interpreter, if need be. We will
change some of these later */
@@ -1044,7 +1045,6 @@ static int load_elf_binary(struct linux_binprm *bprm)
goto out;
#endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */
- install_exec_creds(bprm);
retval = create_elf_tables(bprm, &loc->elf_ex,
load_addr, interp_load_addr);
if (retval < 0)