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Revision 77788775c7132a8d93c6930ab1bd84fc743c7cb7 authored by Jens Axboe on 29 December 2020, 17:50:46 UTC, committed by Jens Axboe on 29 December 2020, 18:00:36 UTC 
io_uring: don't assume mm is constant across submits
 
If we COW the identity, we assume that ->mm never changes. But this
isn't true of multiple processes end up sharing the ring. Hence treat
id->mm like like any other process compontent when it comes to the
identity mapping. This is pretty trivial, just moving the existing grab
into io_grab_identity(), and including a check for the match.

Cc: stable@vger.kernel.org # 5.10
Fixes: 1e6fa5216a0e ("io_uring: COW io_identity on mismatch")
Reported-by: Christian Brauner <christian.brauner@ubuntu.com>:
Tested-by: Christian Brauner <christian.brauner@ubuntu.com>:
Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 parent 5c8fe58
Raw File
Makefile.modinst 
# SPDX-License-Identifier: GPL-2.0
# ==========================================================================
# Installing modules
# ==========================================================================

PHONY := __modinst
__modinst:

include scripts/Kbuild.include

modules := $(sort $(shell cat $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)modules.order))

PHONY += $(modules)
__modinst: $(modules)
	@:

# Don't stop modules_install if we can't sign external modules.
quiet_cmd_modules_install = INSTALL $@
      cmd_modules_install = \
    mkdir -p $(2) ; \
    cp $@ $(2) ; \
    $(mod_strip_cmd) $(2)/$(notdir $@) ; \
    $(mod_sign_cmd) $(2)/$(notdir $@) $(patsubst %,|| true,$(KBUILD_EXTMOD)) ; \
    $(mod_compress_cmd) $(2)/$(notdir $@)

# Modules built outside the kernel source tree go into extra by default
INSTALL_MOD_DIR ?= extra
ext-mod-dir = $(INSTALL_MOD_DIR)$(subst $(patsubst %/,%,$(KBUILD_EXTMOD)),,$(@D))

modinst_dir = $(if $(KBUILD_EXTMOD),$(ext-mod-dir),kernel/$(@D))

$(modules):
	$(call cmd,modules_install,$(MODLIB)/$(modinst_dir))

.PHONY: $(PHONY)
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