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| author | Andrea Arcangeli <andrea@cpushare.com> | 2017-07-25 22:22:45 +0200 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2017-08-05 13:52:44 +0200 |
| commit | 10c8ca605b0d293aeee50326cc4119dbb5b5393d (patch) | |
| tree | 70796ea6a50dee256b909bd619ffd48b6c8532f6 /net/core/dev.c | |
| parent | 4bf1ddff1f44d3dbf8aa138eb4d6d01ec29428ff (diff) | |
fs/exec: fix use after free in execve
"file" can be already freed if bprm->file is NULL after
search_binary_handler() return. binfmt_script will do exactly that for
example. If the VM reuses the file after fput run(), this will result in
a use ater free.
So obtain d_is_su before search_binary_handler() runs.
This should explain this crash:
[25333.009554] Unable to handle kernel NULL pointer dereference at virtual address 00000185
[..]
[25333.009918] [2: am:21861] PC is at do_execve+0x354/0x474
Change-Id: I2a8a814d1c0aa75625be83cb30432cf13f1a0681
Signed-off-by: Kevin F. Haggerty <haggertk@lineageos.org>
Diffstat (limited to 'net/core/dev.c')
0 files changed, 0 insertions, 0 deletions