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prlimit: do_prlimit needs to have a speculation check 

BugLink: https://bugs.launchpad.net/bugs/2008946

commit 739790605705ddcf18f21782b9c99ad7d53a8c11 upstream.

do_prlimit() adds the user-controlled resource value to a pointer that
will subsequently be dereferenced.  In order to help prevent this
codepath from being used as a spectre "gadget" a barrier needs to be
added after checking the range.

Reported-by: Jordy Zomer <jordyzomer@google.com>
Tested-by: Jordy Zomer <jordyzomer@google.com>
Suggested-by: Linus Torvalds <torvalds@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Greg Kroah-Hartman 2023-01-20 11:03:20 +01:00 committed by Stefan Bader
parent bd245cdca5
commit f2e5ae2bf3
1 changed files with 2 additions and 0 deletions
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2
kernel/sys.c
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@ -1549,6 +1549,8 @@ int do_prlimit(struct task_struct *tsk, unsigned int resource,
if (resource >= RLIM_NLIMITS)
return -EINVAL;
resource = array_index_nospec(resource, RLIM_NLIMITS);
if (new_rlim) {
if (new_rlim->rlim_cur > new_rlim->rlim_max)
return -EINVAL;