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From: Andrew Morton <akpm@linux-foundation.org>
To: arjunroy@google.com, bgeffon@google.com, dancol@google.com,
	hannes@cmpxchg.org, joaodias@google.com, joel@joelfernandes.org,
	mhocko@suse.com, minchan@kernel.org, mm-commits@vger.kernel.org,
	oleksandr@redhat.com, rientjes@google.com, shakeelb@google.com,
	sj38.park@gmail.com, sonnyrao@google.com, sspatil@google.com,
	surenb@google.com, timmurray@google.com, vbabka@suse.cz
Subject: + mm-support-vector-address-ranges-for-process_madvise-fix.patch added to -mm tree
Date: Thu, 23 Apr 2020 15:44:23 -0700
Message-ID: <20200423224423.qb8oLW8UR%akpm@linux-foundation.org> (raw)
In-Reply-To: <20200420181310.c18b3c0aa4dc5b3e5ec1be10@linux-foundation.org>


The patch titled
     Subject: mm: support compat_sys_process_madvise
has been added to the -mm tree.  Its filename is
     mm-support-vector-address-ranges-for-process_madvise-fix.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-support-vector-address-ranges-for-process_madvise-fix.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-support-vector-address-ranges-for-process_madvise-fix.patch

Before you just go and hit "reply", please:
   a) Consider who else should be cc'ed
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: Minchan Kim <minchan@kernel.org>
Subject: mm: support compat_sys_process_madvise

This patch supports compat syscall for process_madvise

Link: http://lkml.kernel.org/r/20200423195835.GA46847@google.com
Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: Arjun Roy <arjunroy@google.com>
Cc: Brian Geffon <bgeffon@google.com>
Cc: Daniel Colascione <dancol@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: John Dias <joaodias@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oleksandr Natalenko <oleksandr@redhat.com>
Cc: Sandeep Patil <sspatil@google.com>
Cc: SeongJae Park <sj38.park@gmail.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Sonny Rao <sonnyrao@google.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Tim Murray <timmurray@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/arm64/include/asm/unistd32.h         |    2 
 arch/mips/kernel/syscalls/syscall_n32.tbl |    2 
 arch/parisc/kernel/syscalls/syscall.tbl   |    2 
 arch/powerpc/kernel/syscalls/syscall.tbl  |    2 
 arch/s390/kernel/syscalls/syscall.tbl     |    2 
 arch/sparc/kernel/syscalls/syscall.tbl    |    2 
 arch/x86/entry/syscalls/syscall_32.tbl    |    2 
 arch/x86/entry/syscalls/syscall_64.tbl    |    3 -
 include/linux/compat.h                    |    3 +
 include/uapi/asm-generic/unistd.h         |    3 -
 kernel/sys_ni.c                           |    1 
 mm/madvise.c                              |   60 +++++++++++++++-----
 12 files changed, 60 insertions(+), 24 deletions(-)

--- a/arch/arm64/include/asm/unistd32.h~mm-support-vector-address-ranges-for-process_madvise-fix
+++ a/arch/arm64/include/asm/unistd32.h
@@ -884,7 +884,7 @@ __SYSCALL(__NR_openat2, sys_openat2)
 #define __NR_pidfd_getfd 438
 __SYSCALL(__NR_pidfd_getfd, sys_pidfd_getfd)
 #define __NR_process_madvise 439
-__SYSCALL(__NR_process_madvise, sys_process_madvise)
+__SYSCALL(__NR_process_madvise, compat_sys_process_madvise)
 
 /*
  * Please add new compat syscalls above this comment and update
--- a/arch/mips/kernel/syscalls/syscall_n32.tbl~mm-support-vector-address-ranges-for-process_madvise-fix
+++ a/arch/mips/kernel/syscalls/syscall_n32.tbl
@@ -376,4 +376,4 @@
 435	n32	clone3				__sys_clone3
 437	n32	openat2				sys_openat2
 438	n32	pidfd_getfd			sys_pidfd_getfd
-439	n32	process_madvise			sys_process_madvise
+439	n32	process_madvise			compat_sys_process_madvise
--- a/arch/parisc/kernel/syscalls/syscall.tbl~mm-support-vector-address-ranges-for-process_madvise-fix
+++ a/arch/parisc/kernel/syscalls/syscall.tbl
@@ -435,4 +435,4 @@
 435	common	clone3				sys_clone3_wrapper
 437	common	openat2				sys_openat2
 438	common	pidfd_getfd			sys_pidfd_getfd
-439	common	process_madvise			sys_process_madvise
+439	common	process_madvise			sys_process_madvise		compat_sys_process_madvise
--- a/arch/powerpc/kernel/syscalls/syscall.tbl~mm-support-vector-address-ranges-for-process_madvise-fix
+++ a/arch/powerpc/kernel/syscalls/syscall.tbl
@@ -527,4 +527,4 @@
 435	spu	clone3				sys_ni_syscall
 437	common	openat2				sys_openat2
 438	common	pidfd_getfd			sys_pidfd_getfd
-439	common	process_madvise			sys_process_madvise
+439	common	process_madvise			sys_process_madvise		compat_sys_process_madvise
--- a/arch/s390/kernel/syscalls/syscall.tbl~mm-support-vector-address-ranges-for-process_madvise-fix
+++ a/arch/s390/kernel/syscalls/syscall.tbl
@@ -440,4 +440,4 @@
 435  common	clone3			sys_clone3			sys_clone3
 437  common	openat2			sys_openat2			sys_openat2
 438  common	pidfd_getfd		sys_pidfd_getfd			sys_pidfd_getfd
-439  common	process_madvise		sys_process_madvise		sys_process_madvise
+439  common	process_madvise		sys_process_madvise		compat_sys_process_madvise
--- a/arch/sparc/kernel/syscalls/syscall.tbl~mm-support-vector-address-ranges-for-process_madvise-fix
+++ a/arch/sparc/kernel/syscalls/syscall.tbl
@@ -483,4 +483,4 @@
 # 435 reserved for clone3
 437	common	openat2			sys_openat2
 438	common	pidfd_getfd			sys_pidfd_getfd
-439	common	process_madvise			sys_process_madvise
+439	common	process_madvise			sys_process_madvise		compat_sys_process_madvise
--- a/arch/x86/entry/syscalls/syscall_32.tbl~mm-support-vector-address-ranges-for-process_madvise-fix
+++ a/arch/x86/entry/syscalls/syscall_32.tbl
@@ -442,4 +442,4 @@
 435	i386	clone3			sys_clone3
 437	i386	openat2			sys_openat2
 438	i386	pidfd_getfd		sys_pidfd_getfd
-439	i386	process_madvise		sys_process_madvise
+439	i386	process_madvise		sys_process_madvise		compat_sys_process_madvise
--- a/arch/x86/entry/syscalls/syscall_64.tbl~mm-support-vector-address-ranges-for-process_madvise-fix
+++ a/arch/x86/entry/syscalls/syscall_64.tbl
@@ -359,7 +359,7 @@
 435	common	clone3			sys_clone3
 437	common	openat2			sys_openat2
 438	common	pidfd_getfd		sys_pidfd_getfd
-439	common	process_madvise		sys_process_madvise
+439	64	process_madvise		sys_process_madvise
 
 #
 # x32-specific system call numbers start at 512 to avoid cache impact
@@ -403,3 +403,4 @@
 545	x32	execveat		compat_sys_execveat
 546	x32	preadv2			compat_sys_preadv64v2
 547	x32	pwritev2		compat_sys_pwritev64v2
+548	x32	process_madvise		compat_sys_process_madvise
--- a/include/linux/compat.h~mm-support-vector-address-ranges-for-process_madvise-fix
+++ a/include/linux/compat.h
@@ -820,6 +820,9 @@ asmlinkage long compat_sys_pwritev64v2(u
 		unsigned long vlen, loff_t pos, rwf_t flags);
 #endif
 
+asmlinkage ssize_t compat_sys_process_madvise(int which,
+		compat_pid_t upid, const struct compat_iovec __user *vec,
+		unsigned long vlen, int behavior, unsigned long flags);
 
 /*
  * Deprecated system calls which are still defined in
--- a/include/uapi/asm-generic/unistd.h~mm-support-vector-address-ranges-for-process_madvise-fix
+++ a/include/uapi/asm-generic/unistd.h
@@ -856,7 +856,8 @@ __SYSCALL(__NR_openat2, sys_openat2)
 #define __NR_pidfd_getfd 438
 __SYSCALL(__NR_pidfd_getfd, sys_pidfd_getfd)
 #define __NR_process_madvise 439
-__SYSCALL(__NR_process_madvise, sys_process_madvise)
+__SC_COMP(__NR_process_madvise, sys_process_madvise, \
+		compat_sys_process_madvise)
 
 #undef __NR_syscalls
 #define __NR_syscalls 440
--- a/kernel/sys_ni.c~mm-support-vector-address-ranges-for-process_madvise-fix
+++ a/kernel/sys_ni.c
@@ -281,6 +281,7 @@ COND_SYSCALL(munlockall);
 COND_SYSCALL(mincore);
 COND_SYSCALL(madvise);
 COND_SYSCALL(process_madvise);
+COND_SYSCALL_COMPAT(process_madvise);
 COND_SYSCALL(remap_file_pages);
 COND_SYSCALL(mbind);
 COND_SYSCALL_COMPAT(mbind);
--- a/mm/madvise.c~mm-support-vector-address-ranges-for-process_madvise-fix
+++ a/mm/madvise.c
@@ -1195,7 +1195,7 @@ SYSCALL_DEFINE3(madvise, unsigned long,
 	return do_madvise(current, current->mm, start, len_in, behavior);
 }
 
-static int do_process_madvise(struct task_struct *target_task,
+static int process_madvise_vec(struct task_struct *target_task,
 		struct mm_struct *mm, struct iov_iter *iter, int behavior)
 {
 	struct iovec iovec;
@@ -1213,17 +1213,14 @@ static int do_process_madvise(struct tas
 	return ret;
 }
 
-SYSCALL_DEFINE6(process_madvise, int, which, pid_t, upid,
-		const struct iovec __user *, vec, unsigned long, vlen,
-		int, behavior, unsigned long, flags)
+ssize_t do_process_madvise(int which, pid_t upid, struct iov_iter *iter,
+				int behavior, unsigned long flags)
 {
 	ssize_t ret;
 	struct pid *pid;
 	struct task_struct *task;
 	struct mm_struct *mm;
-	struct iovec iovstack[UIO_FASTIOV];
-	struct iovec *iov = iovstack;
-	struct iov_iter iter;
+	size_t total_len = iov_iter_count(iter);
 
 	if (flags != 0)
 		return -EINVAL;
@@ -1267,15 +1264,10 @@ SYSCALL_DEFINE6(process_madvise, int, wh
 		goto release_task;
 	}
 
-	ret = import_iovec(READ, vec, vlen, ARRAY_SIZE(iovstack), &iov, &iter);
-	if (ret >= 0) {
-		size_t total_len = iov_iter_count(&iter);
+	ret = process_madvise_vec(task, mm, iter, behavior);
+	if (ret >= 0)
+		ret = total_len - iov_iter_count(iter);
 
-		ret = do_process_madvise(task, mm, &iter, behavior);
-		if (ret >= 0)
-			ret = total_len - iov_iter_count(&iter);
-		kfree(iov);
-	}
 	mmput(mm);
 release_task:
 	put_task_struct(task);
@@ -1283,3 +1275,41 @@ put_pid:
 	put_pid(pid);
 	return ret;
 }
+
+SYSCALL_DEFINE6(process_madvise, int, which, pid_t, upid,
+		const struct iovec __user *, vec, unsigned long, vlen,
+		int, behavior, unsigned long, flags)
+{
+	ssize_t ret;
+	struct iovec iovstack[UIO_FASTIOV];
+	struct iovec *iov = iovstack;
+	struct iov_iter iter;
+
+	ret = import_iovec(READ, vec, vlen, ARRAY_SIZE(iovstack), &iov, &iter);
+	if (ret >= 0) {
+		ret = do_process_madvise(which, upid, &iter, behavior, flags);
+		kfree(iov);
+	}
+	return ret;
+}
+
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE6(process_madvise, int, which, compat_pid_t, upid,
+		const struct compat_iovec __user *, vec, unsigned long, vlen,
+		int, behavior, unsigned long, flags)
+
+{
+	ssize_t ret;
+	struct iovec iovstack[UIO_FASTIOV];
+	struct iovec *iov = iovstack;
+	struct iov_iter iter;
+
+	ret = compat_import_iovec(READ, vec, vlen, ARRAY_SIZE(iovstack),
+				&iov, &iter);
+	if (ret >= 0) {
+		ret = do_process_madvise(which, upid, &iter, behavior, flags);
+		kfree(iov);
+	}
+	return ret;
+}
+#endif
_

Patches currently in -mm which might be from minchan@kernel.org are

mm-pass-task-and-mm-to-do_madvise.patch
mm-pass-task-and-mm-to-do_madvise-fix.patch
mm-introduce-external-memory-hinting-api.patch
mm-introduce-external-memory-hinting-api-fix.patch
mm-check-fatal-signal-pending-of-target-process.patch
pid-move-pidfd_get_pid-function-to-pidc.patch
mm-support-both-pid-and-pidfd-for-process_madvise.patch
mm-support-vector-address-ranges-for-process_madvise.patch
mm-support-vector-address-ranges-for-process_madvise-fix.patch

  parent reply index

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-21  1:13 incoming Andrew Morton
2020-04-21  1:13 ` [patch 01/15] sh: fix build error in mm/init.c Andrew Morton
2020-04-21  1:13 ` [patch 02/15] slub: avoid redzone when choosing freepointer location Andrew Morton
2020-04-21  1:13 ` [patch 03/15] mm/userfaultfd: disable userfaultfd-wp on x86_32 Andrew Morton
2020-04-21  1:13 ` [patch 04/15] MAINTAINERS: add an entry for kfifo Andrew Morton
2020-04-21  1:13 ` [patch 05/15] mm/hugetlb: fix a addressing exception caused by huge_pte_offset Andrew Morton
2020-04-21  1:13 ` [patch 06/15] mm, gup: return EINTR when gup is interrupted by fatal signals Andrew Morton
2020-04-21  1:13 ` [patch 07/15] checkpatch: fix a typo in the regex for $allocFunctions Andrew Morton
2020-04-21  1:14 ` [patch 08/15] tools/build: tweak unused value workaround Andrew Morton
2020-04-21  1:14 ` [patch 09/15] mm/ksm: fix NULL pointer dereference when KSM zero page is enabled Andrew Morton
2020-04-21  1:14 ` [patch 10/15] mm/shmem: fix build without THP Andrew Morton
2020-04-21  1:14 ` [patch 11/15] vmalloc: fix remap_vmalloc_range() bounds checks Andrew Morton
2020-04-21  1:14 ` [patch 12/15] shmem: fix possible deadlocks on shmlock_user_lock Andrew Morton
2020-04-21  1:14 ` [patch 13/15] mm: shmem: disable interrupt when acquiring info->lock in userfaultfd_copy path Andrew Morton
2020-04-21  1:14 ` [patch 14/15] coredump: fix null pointer dereference on coredump Andrew Morton
2020-04-21  1:14 ` [patch 15/15] tools/vm: fix cross-compile build Andrew Morton
2020-04-21  2:00 ` + mm-memory_hotplug-refrain-from-adding-memory-into-an-impossible-node.patch added to -mm tree Andrew Morton
2020-04-21  2:48 ` + x86-mm-define-mm_p4d_folded.patch " Andrew Morton
2020-04-21  2:52 ` + mm-debug-add-tests-validating-architecture-page-table-helpers-v17.patch " Andrew Morton
2020-04-21  2:59 ` + mm-mmapc-add-more-sanity-checks-to-get_unmapped_area.patch " Andrew Morton
2020-04-21  2:59 ` + mm-mmapc-do-not-allow-mappings-outside-of-allowed-limits.patch " Andrew Morton
2020-04-21  3:07 ` + initrdmem=-option-to-specify-initrd-physical-address-checkpatch-fixes.patch " Andrew Morton
2020-04-21  3:58 ` + initrdmem=-option-to-specify-initrd-physical-address.patch " Andrew Morton
2020-04-21  5:43 ` mmotm 2020-04-20-22-43 uploaded Andrew Morton
2020-04-22  1:36 ` + mm-swapfilec-found_free-could-be-represented-by-tmp-max.patch added to -mm tree Andrew Morton
2020-04-22  1:36 ` + mm-swapfilec-tmp-is-always-smaller-than-max.patch " Andrew Morton
2020-04-22  1:36 ` + mm-swapfilec-omit-a-duplicate-code-by-compare-tmp-and-max-first.patch " Andrew Morton
2020-04-23 22:36 ` + kasan-initialise-array-in-kasan_memcmp-test.patch " Andrew Morton
2020-04-23 22:38 ` + kvm-svm-change-flag-passed-to-gup-fast-in-sev_pin_memory.patch " Andrew Morton
2020-04-23 22:41 ` + mm-pass-task-and-mm-to-do_madvise-fix.patch " Andrew Morton
2020-04-23 22:44 ` + mm-support-vector-address-ranges-for-process_madvise.patch " Andrew Morton
2020-04-23 22:44 ` Andrew Morton [this message]
2020-04-23 22:48 ` + kasan-stop-tests-being-eliminated-as-dead-code-with-fortify_source.patch " Andrew Morton
2020-04-23 22:48 ` + stringh-fix-incompatibility-between-fortify_source-and-kasan.patch " Andrew Morton
2020-04-23 23:03 ` + powerpc-add-support-for-folded-p4d-page-tables-fix.patch " Andrew Morton
2020-04-23 23:09 ` [folded-merged] memcg-optimize-memorynuma_stat-like-memorystat-fix.patch removed from " Andrew Morton
2020-04-23 23:32 ` + slub-remove-userspace-notifier-for-cache-add-remove.patch added to " Andrew Morton
2020-04-23 23:35 ` + ocfs2-mount-shared-volume-without-ha-stack.patch " Andrew Morton
2020-04-24  0:29 ` + mm-memory_hotplug-handle-memblocks-only-with-config_arch_keep_memblock.patch " Andrew Morton
2020-04-24  1:17 ` + mm-return-true-in-cpupid_pid_unset.patch " Andrew Morton
2020-04-24  1:20 ` + kernel-better-document-the-use_mm-unuse_mm-api-contract-v2-fix.patch " Andrew Morton
2020-04-24  1:40 ` + mm-thp-rename-pmd_mknotpresent-as-pmd_mkinvalid-v2.patch " Andrew Morton
2020-04-24  1:47 ` + ipc-convert-ipcs_idr-to-xarray-update.patch " Andrew Morton
     [not found]   ` <20200605195848.GB5393@lca.pw>
     [not found]     ` <20200605201134.GJ19604@bombadil.infradead.org>
2020-06-05 21:20       ` Andrew Morton
2020-12-30 15:44   ` Manfred Spraul
2020-04-24  2:06 ` + powerpc-spufs-simplify-spufs-core-dumping.patch " Andrew Morton
2020-04-24  2:06 ` + signal-factor-copy_siginfo_to_external32-from-copy_siginfo_to_user32.patch " Andrew Morton
2020-04-24  2:06 ` + binfmt_elf-femove-the-set_fs-in-fill_siginfo_note.patch " Andrew Morton
2020-04-24  2:06 ` + binfmt_elf-remove-the-set_fskernel_ds-in-elf_core_dump.patch " Andrew Morton
2020-04-24  2:06 ` + binfmt_elf_fdpic-remove-the-set_fskernel_ds-in-elf_fdpic_core_dump.patch " Andrew Morton
2020-04-24  2:06 ` + exec-simplify-the-copy_strings_kernel-calling-convention.patch " Andrew Morton
2020-04-24  2:06 ` + exec-open-code-copy_string_kernel.patch " Andrew Morton
2020-04-24  3:24 ` + add-kernel-config-option-for-twisting-kernel-behavior.patch " Andrew Morton
2020-04-24  3:24 ` + twist-allow-disabling-k_spec-function-in-drivers-tty-vt-keyboardc.patch " Andrew Morton
2020-04-24  3:24 ` + twist-add-option-for-selecting-twist-options-for-syzkallers-testing.patch " Andrew Morton
2020-04-24  3:32 ` + eventpoll-fix-missing-wakeup-for-ovflist-in-ep_poll_callback.patch " Andrew Morton
2020-04-24  3:49 ` [obsolete] linux-next-rejects.patch removed from " Andrew Morton
2020-04-24  3:51 ` + mips-mm-add-page-soft-dirty-tracking.patch added to " Andrew Morton
2020-04-24 23:36 ` + mm-memory_hotplug-set-node_start_pfn-of-hotadded-pgdat-to-0.patch " Andrew Morton
2020-04-26  0:09 ` + mm-switch-the-test_vmalloc-module-to-use-__vmalloc_node-fix-fix.patch " Andrew Morton
2020-04-26  0:17 ` + mm-hugetlb-avoid-unnecessary-check-on-pud-and-pmd-entry-in-huge_pte_offset.patch " Andrew Morton
2020-04-26  0:29 ` + eventpoll-fix-missing-wakeup-for-ovflist-in-ep_poll_callback-v2.patch " Andrew Morton
2020-04-26  0:41 ` [withdrawn] kasan-initialise-array-in-kasan_memcmp-test.patch removed from " Andrew Morton
2020-04-26  0:41 ` + kasan-stop-tests-being-eliminated-as-dead-code-with-fortify_source-v4.patch added to " Andrew Morton
2020-04-26  0:48 ` + checkpatch-test-git_dir-changes.patch " Andrew Morton
2020-04-26  1:06 ` + mm-add-debug_wx-support.patch " Andrew Morton
2020-04-26  1:06 ` + riscv-support-debug_wx.patch " Andrew Morton
2020-04-26  1:06 ` + riscv-support-debug_wx-fix.patch " Andrew Morton
2020-04-26  1:06 ` + x86-mm-use-arch_has_debug_wx-instead-of-arch-defined.patch " Andrew Morton
2020-04-26  1:06 ` + arm64-mm-use-arch_has_debug_wx-instead-of-arch-defined.patch " Andrew Morton
2020-04-26  1:09 ` [folded-merged] initrdmem=-option-to-specify-initrd-physical-address-checkpatch-fixes.patch removed from " Andrew Morton

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Archives are clonable:
	git clone --mirror https://lore.kernel.org/mm-commits/0 mm-commits/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 mm-commits mm-commits/ https://lore.kernel.org/mm-commits \
		mm-commits@vger.kernel.org
	public-inbox-index mm-commits

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.mm-commits


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git