2ffe12911e
- setfiles/restorecon: support parallel relabeling with -T <N> option - semodule: add -m | --checksum option
254 lines
8.1 KiB
Diff
254 lines
8.1 KiB
Diff
From fba88f42bf8490a23fa6dcd33de2ccd59170009b Mon Sep 17 00:00:00 2001
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From: Ondrej Mosnacek <omosnace@redhat.com>
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Date: Tue, 26 Oct 2021 13:52:39 +0200
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Subject: [PATCH] setfiles/restorecon: support parallel relabeling
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Use the newly introduced selinux_restorecon_parallel(3) in
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setfiles/restorecon and a -T option to both to allow enabling parallel
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relabeling. The default behavior without specifying the -T option is to
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use 1 thread; parallel relabeling must be requested explicitly by
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passing -T 0 (which will use as many threads as there are available CPU
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cores) or -T <N>, which will use <N> threads.
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=== Benchmarks ===
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As measured on a 32-core cloud VM with Fedora 34. Not a fully
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representative environment, but still the scaling is quite good.
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WITHOUT PATCHES:
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$ time restorecon -rn /usr
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real 0m21.689s
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user 0m21.070s
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sys 0m0.494s
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WITH PATCHES:
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$ time restorecon -rn /usr
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real 0m23.940s
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user 0m23.127s
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sys 0m0.653s
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$ time restorecon -rn -T 2 /usr
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real 0m13.145s
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user 0m25.306s
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sys 0m0.695s
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$ time restorecon -rn -T 4 /usr
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real 0m7.559s
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user 0m28.470s
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sys 0m1.099s
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$ time restorecon -rn -T 8 /usr
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real 0m5.186s
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user 0m37.450s
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sys 0m2.094s
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$ time restorecon -rn -T 16 /usr
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real 0m3.831s
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user 0m51.220s
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sys 0m4.895s
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$ time restorecon -rn -T 32 /usr
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real 0m2.650s
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user 1m5.136s
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sys 0m6.614s
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Note that the benchmarks were performed in read-only mode (-n), so the
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labels were only read and looked up in the database, not written. When
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fixing labels on a heavily mislabeled system, the scaling would likely
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be event better, since a larger % of work could be done in parallel.
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Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
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---
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policycoreutils/setfiles/Makefile | 2 +-
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policycoreutils/setfiles/restore.c | 7 ++++---
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policycoreutils/setfiles/restore.h | 2 +-
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policycoreutils/setfiles/restorecon.8 | 9 +++++++++
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policycoreutils/setfiles/setfiles.8 | 9 +++++++++
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policycoreutils/setfiles/setfiles.c | 28 ++++++++++++++++-----------
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6 files changed, 41 insertions(+), 16 deletions(-)
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diff --git a/policycoreutils/setfiles/Makefile b/policycoreutils/setfiles/Makefile
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index 63d818509791..d7670a8ff54b 100644
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--- a/policycoreutils/setfiles/Makefile
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+++ b/policycoreutils/setfiles/Makefile
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@@ -6,7 +6,7 @@ MANDIR = $(PREFIX)/share/man
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AUDITH ?= $(shell test -f /usr/include/libaudit.h && echo y)
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CFLAGS ?= -g -Werror -Wall -W
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-override LDLIBS += -lselinux -lsepol
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+override LDLIBS += -lselinux -lsepol -lpthread
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ifeq ($(AUDITH), y)
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override CFLAGS += -DUSE_AUDIT
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diff --git a/policycoreutils/setfiles/restore.c b/policycoreutils/setfiles/restore.c
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index 9d688c609f79..74d48bb3752d 100644
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--- a/policycoreutils/setfiles/restore.c
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+++ b/policycoreutils/setfiles/restore.c
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@@ -72,7 +72,7 @@ void restore_finish(void)
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}
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}
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-int process_glob(char *name, struct restore_opts *opts)
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+int process_glob(char *name, struct restore_opts *opts, size_t nthreads)
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{
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glob_t globbuf;
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size_t i = 0;
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@@ -91,8 +91,9 @@ int process_glob(char *name, struct restore_opts *opts)
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continue;
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if (len > 0 && strcmp(&globbuf.gl_pathv[i][len], "/..") == 0)
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continue;
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- rc = selinux_restorecon(globbuf.gl_pathv[i],
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- opts->restorecon_flags);
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+ rc = selinux_restorecon_parallel(globbuf.gl_pathv[i],
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+ opts->restorecon_flags,
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+ nthreads);
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if (rc < 0)
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errors = rc;
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}
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diff --git a/policycoreutils/setfiles/restore.h b/policycoreutils/setfiles/restore.h
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index ac6ad6809f4f..bb35a1db9e34 100644
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--- a/policycoreutils/setfiles/restore.h
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+++ b/policycoreutils/setfiles/restore.h
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@@ -49,7 +49,7 @@ struct restore_opts {
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void restore_init(struct restore_opts *opts);
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void restore_finish(void);
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void add_exclude(const char *directory);
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-int process_glob(char *name, struct restore_opts *opts);
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+int process_glob(char *name, struct restore_opts *opts, size_t nthreads);
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extern char **exclude_list;
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#endif
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diff --git a/policycoreutils/setfiles/restorecon.8 b/policycoreutils/setfiles/restorecon.8
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index a8900f02b3f3..dbd55ce7c512 100644
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--- a/policycoreutils/setfiles/restorecon.8
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+++ b/policycoreutils/setfiles/restorecon.8
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@@ -33,6 +33,8 @@ restorecon \- restore file(s) default SELinux security contexts.
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.RB [ \-W ]
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.RB [ \-I | \-D ]
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.RB [ \-x ]
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+.RB [ \-T
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+.IR nthreads ]
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.SH "DESCRIPTION"
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This manual page describes the
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@@ -160,6 +162,13 @@ prevent
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.B restorecon
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from crossing file system boundaries.
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.TP
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+.BI \-T \ nthreads
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+use up to
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+.I nthreads
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+threads. Specify 0 to create as many threads as there are available
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+CPU cores; 1 to use only a single thread (default); or any positive
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+number to use the given number of threads (if possible).
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+.TP
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.SH "ARGUMENTS"
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.IR pathname \ ...
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The pathname for the file(s) to be relabeled.
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diff --git a/policycoreutils/setfiles/setfiles.8 b/policycoreutils/setfiles/setfiles.8
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index 0692121f2f4d..8ef9f602e843 100644
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--- a/policycoreutils/setfiles/setfiles.8
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+++ b/policycoreutils/setfiles/setfiles.8
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@@ -19,6 +19,8 @@ setfiles \- set SELinux file security contexts.
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.RB [ \-W ]
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.RB [ \-F ]
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.RB [ \-I | \-D ]
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+.RB [ \-T
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+.IR nthreads ]
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.I spec_file
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.IR pathname \ ...
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@@ -161,6 +163,13 @@ quote marks or backslashes. The
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option of GNU
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.B find
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produces input suitable for this mode.
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+.TP
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+.BI \-T \ nthreads
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+use up to
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+.I nthreads
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+threads. Specify 0 to create as many threads as there are available
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+CPU cores; 1 to use only a single thread (default); or any positive
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+number to use the given number of threads (if possible).
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.SH "ARGUMENTS"
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.TP
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diff --git a/policycoreutils/setfiles/setfiles.c b/policycoreutils/setfiles/setfiles.c
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index f018d161aa9e..2313a21fa0f3 100644
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--- a/policycoreutils/setfiles/setfiles.c
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+++ b/policycoreutils/setfiles/setfiles.c
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@@ -1,4 +1,5 @@
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#include "restore.h"
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+#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdio_ext.h>
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@@ -34,14 +35,14 @@ static __attribute__((__noreturn__)) void usage(const char *const name)
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{
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if (iamrestorecon) {
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fprintf(stderr,
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- "usage: %s [-iIDFmnprRv0x] [-e excludedir] pathname...\n"
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- "usage: %s [-iIDFmnprRv0x] [-e excludedir] -f filename\n",
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+ "usage: %s [-iIDFmnprRv0xT] [-e excludedir] pathname...\n"
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+ "usage: %s [-iIDFmnprRv0xT] [-e excludedir] -f filename\n",
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name, name);
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} else {
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fprintf(stderr,
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- "usage: %s [-diIDlmnpqvEFW] [-e excludedir] [-r alt_root_path] [-c policyfile] spec_file pathname...\n"
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- "usage: %s [-diIDlmnpqvEFW] [-e excludedir] [-r alt_root_path] [-c policyfile] spec_file -f filename\n"
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- "usage: %s -s [-diIDlmnpqvFW] spec_file\n",
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+ "usage: %s [-diIDlmnpqvEFWT] [-e excludedir] [-r alt_root_path] [-c policyfile] spec_file pathname...\n"
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+ "usage: %s [-diIDlmnpqvEFWT] [-e excludedir] [-r alt_root_path] [-c policyfile] spec_file -f filename\n"
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+ "usage: %s -s [-diIDlmnpqvFWT] spec_file\n",
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name, name, name);
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}
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exit(-1);
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@@ -144,12 +145,12 @@ int main(int argc, char **argv)
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int opt, i = 0;
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const char *input_filename = NULL;
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int use_input_file = 0;
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- char *buf = NULL;
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- size_t buf_len;
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+ char *buf = NULL, *endptr;
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+ size_t buf_len, nthreads = 1;
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const char *base;
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int errors = 0;
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- const char *ropts = "e:f:hiIDlmno:pqrsvFRW0x";
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- const char *sopts = "c:de:f:hiIDlmno:pqr:svEFR:W0";
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+ const char *ropts = "e:f:hiIDlmno:pqrsvFRW0xT:";
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+ const char *sopts = "c:de:f:hiIDlmno:pqr:svEFR:W0T:";
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const char *opts;
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union selinux_callback cb;
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@@ -370,6 +371,11 @@ int main(int argc, char **argv)
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usage(argv[0]);
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}
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break;
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+ case 'T':
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+ nthreads = strtoull(optarg, &endptr, 10);
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+ if (*optarg == '\0' || *endptr != '\0')
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+ usage(argv[0]);
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+ break;
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case 'h':
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case '?':
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usage(argv[0]);
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@@ -448,13 +454,13 @@ int main(int argc, char **argv)
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buf[len - 1] = 0;
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if (!strcmp(buf, "/"))
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r_opts.mass_relabel = SELINUX_RESTORECON_MASS_RELABEL;
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- errors |= process_glob(buf, &r_opts) < 0;
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+ errors |= process_glob(buf, &r_opts, nthreads) < 0;
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}
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if (strcmp(input_filename, "-") != 0)
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fclose(f);
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} else {
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for (i = optind; i < argc; i++)
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- errors |= process_glob(argv[i], &r_opts) < 0;
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+ errors |= process_glob(argv[i], &r_opts, nthreads) < 0;
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}
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maybe_audit_mass_relabel(r_opts.mass_relabel, errors);
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--
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2.33.1
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