diff options
| author | Alexey Dobriyan <[email protected]> | 2021-03-14 20:51:14 +0000 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2021-03-14 21:33:27 +0000 |
| commit | c995f12ad8842dbf5cfed113fb52cdd083f5afd1 (patch) | |
| tree | 92dd0fb652dcb361423365b28ee32888ab2257c8 /drivers/firmware/psci/psci.c | |
| parent | Merge tag 'irq-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kerne... (diff) | |
| download | kernel-c995f12ad8842dbf5cfed113fb52cdd083f5afd1.tar.gz kernel-c995f12ad8842dbf5cfed113fb52cdd083f5afd1.zip | |
prctl: fix PR_SET_MM_AUXV kernel stack leak
Doing a
prctl(PR_SET_MM, PR_SET_MM_AUXV, addr, 1);
will copy 1 byte from userspace to (quite big) on-stack array
and then stash everything to mm->saved_auxv.
AT_NULL terminator will be inserted at the very end.
/proc/*/auxv handler will find that AT_NULL terminator
and copy original stack contents to userspace.
This devious scheme requires CAP_SYS_RESOURCE.
Signed-off-by: Alexey Dobriyan <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'drivers/firmware/psci/psci.c')
0 files changed, 0 insertions, 0 deletions