7d930a4da1
commit 2f03fc340cac9ea1dc63cbf8c93dd2eb0f227815 upstream.
Since tomoyo_write_control() updates head->write_buf when write()
of long lines is requested, we need to fetch head->write_buf after
head->io_sem is held. Otherwise, concurrent write() requests can
cause use-after-free-write and double-free problems.
Reported-by: Sam Sun <samsun1006219@gmail.com>
Closes: https://lkml.kernel.org/r/CAEkJfYNDspuGxYx5kym8Lvp--D36CMDUErg4rxfWFJuPbbji8g@mail.gmail.com
Fixes:
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|---|---|---|
| .. | ||
| policy | ||
| .gitignore | ||
| Kconfig | ||
| Makefile | ||
| audit.c | ||
| common.c | ||
| common.h | ||
| condition.c | ||
| domain.c | ||
| environ.c | ||
| file.c | ||
| gc.c | ||
| group.c | ||
| load_policy.c | ||
| memory.c | ||
| mount.c | ||
| network.c | ||
| realpath.c | ||
| securityfs_if.c | ||
| tomoyo.c | ||
| util.c | ||