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| author |   Alexey Dobriyan <adobriyan@gmail.com> | 2021-03-14 23:51:14 +0300 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2021-03-14 14:33:27 -0700 |
| commit | c995f12ad8842dbf5cfed113fb52cdd083f5afd1 (patch) | |
| tree | 92dd0fb652dcb361423365b28ee32888ab2257c8 /.gitignore | |
| parent | Merge tag 'irq-urgent-2021-03-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip (diff) | |
| download | linux-dev-c995f12ad8842dbf5cfed113fb52cdd083f5afd1.tar.xz linux-dev-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 <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '.gitignore')
0 files changed, 0 insertions, 0 deletions