| Message ID | 20191205103331.4040-1-richard_c_haines@btinternet.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [V3,1/1] selinux-testsuite: Add perf_event tests | expand |
On 12/5/19 5:33 AM, Richard Haines wrote: > Test perf_event permissions. > > Signed-off-by: Richard Haines <richard_c_haines@btinternet.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> > --- > V2 Changes: > Remove neverallows from policy > Check /proc/sys/kernel/perf_event_paranoid, if < 2 then bypass the > capability { sys_admin } test. > V3 Changes: > Remove allow_map() and device_t:chr_file rules as not required. > > defconfig | 6 ++ > policy/Makefile | 4 + > policy/test_perf_event.te | 89 +++++++++++++++++ > tests/Makefile | 4 + > tests/perf_event/.gitignore | 1 + > tests/perf_event/Makefile | 7 ++ > tests/perf_event/perf_event.c | 178 ++++++++++++++++++++++++++++++++++ > tests/perf_event/test | 93 ++++++++++++++++++ > 8 files changed, 382 insertions(+) > create mode 100644 policy/test_perf_event.te > create mode 100644 tests/perf_event/.gitignore > create mode 100644 tests/perf_event/Makefile > create mode 100644 tests/perf_event/perf_event.c > create mode 100755 tests/perf_event/test > > diff --git a/defconfig b/defconfig > index 0574f1d..2d9c092 100644 > --- a/defconfig > +++ b/defconfig > @@ -78,3 +78,9 @@ CONFIG_KEY_DH_OPERATIONS=y > # Test key management socket. > # This is not required for SELinux operation itself. > CONFIG_NET_KEY=m > + > +# Test perf events. > +# This is not required for SELinux operation itself. > +CONFIG_HAVE_PERF_EVENTS=y > +CONFIG_PERF_EVENTS=y > +CONFIG_TRACEPOINTS=y > diff --git a/policy/Makefile b/policy/Makefile > index dda2e16..3f60991 100644 > --- a/policy/Makefile > +++ b/policy/Makefile > @@ -101,6 +101,10 @@ ifeq ($(shell grep -q module_load $(POLDEV)/include/support/all_perms.spt && ech > TARGETS+=test_module_load.te > endif > > +ifeq ($(shell grep -q perf_event $(POLDEV)/include/support/all_perms.spt && echo true),true) > +TARGETS += test_perf_event.te > +endif > + > ifeq (x$(DISTRO),$(filter x$(DISTRO),xRHEL4 xRHEL5 xRHEL6)) > TARGETS:=$(filter-out test_overlayfs.te test_mqueue.te test_ibpkey.te, $(TARGETS)) > endif > diff --git a/policy/test_perf_event.te b/policy/test_perf_event.te > new file mode 100644 > index 0000000..2732ecb > --- /dev/null > +++ b/policy/test_perf_event.te > @@ -0,0 +1,89 @@ > +# > +######### Check watch_queue for key changes policy module ########## > +# > +attribute perfdomain; > + > +################# Allow perf_event { * } ########################## > +type test_perf_t; > +domain_type(test_perf_t) > +unconfined_runs_test(test_perf_t) > +typeattribute test_perf_t testdomain; > +typeattribute test_perf_t perfdomain; > + > +allow test_perf_t self:capability { sys_admin }; > +allow test_perf_t self:perf_event { open cpu kernel tracepoint read write }; > + > +################# Deny capability { sys_admin } ########################## > +type test_perf_no_admin_t; > +domain_type(test_perf_no_admin_t) > +unconfined_runs_test(test_perf_no_admin_t) > +typeattribute test_perf_no_admin_t testdomain; > +typeattribute test_perf_no_admin_t perfdomain; > + > +allow test_perf_no_admin_t self:perf_event { open cpu kernel tracepoint read write }; > + > +################# Deny perf_event { open } ########################## > +type test_perf_no_open_t; > +domain_type(test_perf_no_open_t) > +unconfined_runs_test(test_perf_no_open_t) > +typeattribute test_perf_no_open_t testdomain; > +typeattribute test_perf_no_open_t perfdomain; > + > +allow test_perf_no_open_t self:capability { sys_admin }; > +allow test_perf_no_open_t self:perf_event { cpu kernel tracepoint read write }; > + > +################# Deny perf_event { cpu } ########################## > +type test_perf_no_cpu_t; > +domain_type(test_perf_no_cpu_t) > +unconfined_runs_test(test_perf_no_cpu_t) > +typeattribute test_perf_no_cpu_t testdomain; > +typeattribute test_perf_no_cpu_t perfdomain; > + > +allow test_perf_no_cpu_t self:capability { sys_admin }; > +allow test_perf_no_cpu_t self:perf_event { open kernel tracepoint read write }; > + > +################# Deny perf_event { kernel } ########################## > +type test_perf_no_kernel_t; > +domain_type(test_perf_no_kernel_t) > +unconfined_runs_test(test_perf_no_kernel_t) > +typeattribute test_perf_no_kernel_t testdomain; > +typeattribute test_perf_no_kernel_t perfdomain; > + > +allow test_perf_no_kernel_t self:capability { sys_admin }; > +allow test_perf_no_kernel_t self:perf_event { open cpu tracepoint read write }; > + > +################# Deny perf_event { tracepoint } ########################## > +type test_perf_no_tracepoint_t; > +domain_type(test_perf_no_tracepoint_t) > +unconfined_runs_test(test_perf_no_tracepoint_t) > +typeattribute test_perf_no_tracepoint_t testdomain; > +typeattribute test_perf_no_tracepoint_t perfdomain; > + > +allow test_perf_no_tracepoint_t self:capability { sys_admin }; > +allow test_perf_no_tracepoint_t self:perf_event { open cpu kernel read write }; > + > +################# Deny perf_event { read } ########################## > +type test_perf_no_read_t; > +domain_type(test_perf_no_read_t) > +unconfined_runs_test(test_perf_no_read_t) > +typeattribute test_perf_no_read_t testdomain; > +typeattribute test_perf_no_read_t perfdomain; > + > +allow test_perf_no_read_t self:capability { sys_admin }; > +allow test_perf_no_read_t self:perf_event { open cpu kernel tracepoint write }; > + > +################# Deny perf_event { write } ########################## > +type test_perf_no_write_t; > +domain_type(test_perf_no_write_t) > +unconfined_runs_test(test_perf_no_write_t) > +typeattribute test_perf_no_write_t testdomain; > +typeattribute test_perf_no_write_t perfdomain; > + > +allow test_perf_no_write_t self:capability { sys_admin }; > +allow test_perf_no_write_t self:perf_event { open cpu kernel tracepoint read }; > + > +# > +########### Allow these domains to be entered from sysadm domain ############ > +# > +miscfiles_domain_entry_test_files(perfdomain) > +userdom_sysadm_entry_spec_domtrans_to(perfdomain) > diff --git a/tests/Makefile b/tests/Makefile > index 0d33fbf..8f66996 100644 > --- a/tests/Makefile > +++ b/tests/Makefile > @@ -79,6 +79,10 @@ SUBDIRS+=module_load > endif > endif > > +ifeq ($(shell grep -q perf_event $(POLDEV)/include/support/all_perms.spt && echo true),true) > +SUBDIRS += perf_event > +endif > + > ifeq ($(DISTRO),RHEL4) > SUBDIRS:=$(filter-out bounds dyntrace dyntrans inet_socket mmap nnp_nosuid overlay unix_socket, $(SUBDIRS)) > endif > diff --git a/tests/perf_event/.gitignore b/tests/perf_event/.gitignore > new file mode 100644 > index 0000000..8c2f931 > --- /dev/null > +++ b/tests/perf_event/.gitignore > @@ -0,0 +1 @@ > +perf_event > diff --git a/tests/perf_event/Makefile b/tests/perf_event/Makefile > new file mode 100644 > index 0000000..988424c > --- /dev/null > +++ b/tests/perf_event/Makefile > @@ -0,0 +1,7 @@ > +TARGETS = perf_event > +LDLIBS += -lselinux > + > +all: $(TARGETS) > + > +clean: > + rm -f $(TARGETS) > diff --git a/tests/perf_event/perf_event.c b/tests/perf_event/perf_event.c > new file mode 100644 > index 0000000..8983f02 > --- /dev/null > +++ b/tests/perf_event/perf_event.c > @@ -0,0 +1,178 @@ > +#include <stdlib.h> > +#include <stdio.h> > +#include <unistd.h> > +#include <string.h> > +#include <unistd.h> > +#include <errno.h> > +#include <stdbool.h> > +#include <asm/unistd.h> > +#include <sys/mman.h> > +#include <sys/ioctl.h> > +#include <linux/perf_event.h> > +#include <selinux/selinux.h> > + > +enum { > + PERF_FILE_MMAP, > + PERF_FILE, > + PERF_MMAP > +} read_type; > + > +static void print_usage(char *progname) > +{ > + fprintf(stderr, > + "usage: %s [-f|-m] [-v]\n" > + "Where:\n\t" > + "-f Read perf_event info using read(2)\n\t" > + "-m Read perf_event info using mmap(2)\n\t" > + " Default is to use read(2) and mmap(2)\n\t" > + "-v Print information\n", progname); > + exit(-1); > +} > + > +static long perf_event_open(struct perf_event_attr *hw_event, pid_t pid, > + int cpu, int group_fd, unsigned long flags) > +{ > + return syscall(__NR_perf_event_open, hw_event, pid, cpu, > + group_fd, flags); > +} > + > +int main(int argc, char **argv) > +{ > + int opt, result, page_size, mmap_size, fd; > + long long count; > + bool verbose = false; > + char *context; > + void *base; > + struct perf_event_attr pe_attr; > + struct perf_event_mmap_page *pe_page; > + > + read_type = PERF_FILE_MMAP; > + > + while ((opt = getopt(argc, argv, "fmv")) != -1) { > + switch (opt) { > + case 'f': > + read_type = PERF_FILE; > + break; > + case 'm': > + read_type = PERF_MMAP; > + break; > + case 'v': > + verbose = true; > + break; > + default: > + print_usage(argv[0]); > + } > + } > + > + if (verbose) { > + result = getcon(&context); > + if (result < 0) { > + fprintf(stderr, "Failed to obtain process context\n"); > + exit(-1); > + } > + printf("Process context:\n\t%s\n", context); > + free(context); > + } > + > + /* Test perf_event { open cpu kernel tracepoint } */ > + memset(&pe_attr, 0, sizeof(struct perf_event_attr)); > + pe_attr.type = PERF_TYPE_HARDWARE | PERF_TYPE_TRACEPOINT; > + pe_attr.size = sizeof(struct perf_event_attr); > + pe_attr.config = PERF_COUNT_HW_INSTRUCTIONS; > + pe_attr.disabled = 1; > + pe_attr.exclude_hv = 1; > + > + fd = perf_event_open(&pe_attr, -1, 1, -1, 0); > + if (fd < 0) { > + fprintf(stderr, "Failed perf_event_open(): %s\n", > + strerror(errno)); > + if (errno == EACCES) > + exit(1); > + else > + exit(-1); > + } > + > + /* Test perf_event { write }; */ > + result = ioctl(fd, PERF_EVENT_IOC_RESET, 0); > + if (result < 0) { > + fprintf(stderr, "Failed ioctl(PERF_EVENT_IOC_RESET): %s\n", > + strerror(errno)); > + if (errno == EACCES) > + result = 2; > + goto err; > + } > + > + result = ioctl(fd, PERF_EVENT_IOC_ENABLE, 0); > + if (result < 0) { > + fprintf(stderr, "Failed ioctl(PERF_EVENT_IOC_ENABLE): %s\n", > + strerror(errno)); > + if (errno == EACCES) > + result = 3; > + goto err; > + } > + > + result = ioctl(fd, PERF_EVENT_IOC_DISABLE, 0); > + if (result < 0) { > + fprintf(stderr, "Failed ioctl(PERF_EVENT_IOC_DISABLE): %s\n", > + strerror(errno)); > + if (errno == EACCES) > + result = 4; > + goto err; > + } > + > + /* Test mmap(2) perf_event { read } */ > + if (read_type == PERF_MMAP || read_type == PERF_FILE_MMAP) { > + page_size = sysconf(_SC_PAGESIZE); > + if (page_size < 0) { > + fprintf(stderr, "Failed sysconf(_SC_PAGESIZE): %s\n", > + strerror(errno)); > + if (errno == EACCES) > + result = 5; > + else > + result = -1; > + goto err; > + } > + mmap_size = page_size * 2; > + > + base = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, > + MAP_SHARED, fd, 0); > + if (base == MAP_FAILED) { > + fprintf(stderr, "Failed mmap(): %s\n", strerror(errno)); > + if (errno == EACCES) > + result = 6; > + else > + result = -1; > + goto err; > + } > + > + if (verbose) { > + pe_page = base; > + printf("perf mmap(2) return value: %lld\n", > + pe_page->offset); > + } > + > + munmap(base, mmap_size); > + } > + > + /* Test read(2) perf_event { read } */ > + if (read_type == PERF_FILE || read_type == PERF_FILE_MMAP) { > + result = read(fd, &count, sizeof(long long)); > + if (result < 0) { > + fprintf(stderr, "Failed read(): %s\n", strerror(errno)); > + if (errno == EACCES) > + result = 7; > + goto err; > + } > + > + if (verbose) > + printf("perf read(2) return value: %lld\n", count); > + > + close(fd); > + } > + > + return 0; > + > +err: > + close(fd); > + return result; > +} > diff --git a/tests/perf_event/test b/tests/perf_event/test > new file mode 100755 > index 0000000..1c2e4a9 > --- /dev/null > +++ b/tests/perf_event/test > @@ -0,0 +1,93 @@ > +#!/usr/bin/perl > +use Test::More; > + > +BEGIN { > + $basedir = $0; > + $basedir =~ s|(.*)/[^/]*|$1|; > + > + $test_count = 8; > + $sys_admin = 0; > + > + # allow info to be shown during tests > + $v = $ARGV[0]; > + if ($v) { > + if ( $v ne "-v" ) { > + plan skip_all => "Invalid option (use -v)"; > + } > + } > + else { > + $v = " "; > + } > + > + $level = `cat /proc/sys/kernel/perf_event_paranoid`; > + chomp($level); > + if ( $level >= 2 ) { # These tests require CAP_SYS_ADMIN > + $test_count += 1; > + $sys_admin = 1; > + } > + > + if ( $v eq "-v" ) { > + print "Paranoid level: $level\n"; > + if ( $level < 0 ) { > + print "\tNot paranoid\n"; > + } > + elsif ( $level eq 0 ) { > + print "\tDisallow raw tracepoint/ftrace without CAP_SYS_ADMIN\n"; > + } > + elsif ( $level eq 1 ) { > + print "\tDisallow CPU event access without CAP_SYS_ADMIN\n"; > + } > + elsif ( $level eq 2 ) { > + print "\tDisallow kernel profiling without CAP_SYS_ADMIN\n"; > + } > + else { > + print "\tUndefined level\n"; > + } > + } > + > + plan tests => $test_count; > +} > + > +# perf_event { open cpu kernel tracepoint read write }; > +print "Test perf_event\n"; > +$result = system "runcon -t test_perf_t $basedir/perf_event $v"; > +ok( $result eq 0 ); > + > +if ($sys_admin) { > + > + # Deny capability { sys_admin } - EACCES perf_event_open(2) > + $result = > + system "runcon -t test_perf_no_admin_t $basedir/perf_event $v 2>&1"; > + ok( $result >> 8 eq 1 ); > +} > + > +# Deny perf_event { open } - EACCES perf_event_open(2) > +$result = system "runcon -t test_perf_no_open_t $basedir/perf_event $v 2>&1"; > +ok( $result >> 8 eq 1 ); > + > +# Deny perf_event { cpu } - EACCES perf_event_open(2) > +$result = system "runcon -t test_perf_no_cpu_t $basedir/perf_event $v 2>&1"; > +ok( $result >> 8 eq 1 ); > + > +# Deny perf_event { kernel } - EACCES perf_event_open(2) > +$result = system "runcon -t test_perf_no_kernel_t $basedir/perf_event $v 2>&1"; > +ok( $result >> 8 eq 1 ); > + > +# Deny perf_event { tracepoint } - EACCES perf_event_open(2) > +$result = > + system "runcon -t test_perf_no_tracepoint_t $basedir/perf_event $v 2>&1"; > +ok( $result >> 8 eq 1 ); > + > +# Deny perf_event { read } - EACCES mmap(2) > +$result = system "runcon -t test_perf_no_read_t $basedir/perf_event -m $v 2>&1"; > +ok( $result >> 8 eq 6 ); > + > +# Deny perf_event { read } - EACCES read(2) > +$result = system "runcon -t test_perf_no_read_t $basedir/perf_event -f $v 2>&1"; > +ok( $result >> 8 eq 7 ); > + > +# Deny perf_event { write } - EACCES ioctl(2) write > +$result = system "runcon -t test_perf_no_write_t $basedir/perf_event $v 2>&1"; > +ok( $result >> 8 eq 2 ); > + > +exit; >
diff --git a/defconfig b/defconfig index 0574f1d..2d9c092 100644 --- a/defconfig +++ b/defconfig @@ -78,3 +78,9 @@ CONFIG_KEY_DH_OPERATIONS=y # Test key management socket. # This is not required for SELinux operation itself. CONFIG_NET_KEY=m + +# Test perf events. +# This is not required for SELinux operation itself. +CONFIG_HAVE_PERF_EVENTS=y +CONFIG_PERF_EVENTS=y +CONFIG_TRACEPOINTS=y diff --git a/policy/Makefile b/policy/Makefile index dda2e16..3f60991 100644 --- a/policy/Makefile +++ b/policy/Makefile @@ -101,6 +101,10 @@ ifeq ($(shell grep -q module_load $(POLDEV)/include/support/all_perms.spt && ech TARGETS+=test_module_load.te endif +ifeq ($(shell grep -q perf_event $(POLDEV)/include/support/all_perms.spt && echo true),true) +TARGETS += test_perf_event.te +endif + ifeq (x$(DISTRO),$(filter x$(DISTRO),xRHEL4 xRHEL5 xRHEL6)) TARGETS:=$(filter-out test_overlayfs.te test_mqueue.te test_ibpkey.te, $(TARGETS)) endif diff --git a/policy/test_perf_event.te b/policy/test_perf_event.te new file mode 100644 index 0000000..2732ecb --- /dev/null +++ b/policy/test_perf_event.te @@ -0,0 +1,89 @@ +# +######### Check watch_queue for key changes policy module ########## +# +attribute perfdomain; + +################# Allow perf_event { * } ########################## +type test_perf_t; +domain_type(test_perf_t) +unconfined_runs_test(test_perf_t) +typeattribute test_perf_t testdomain; +typeattribute test_perf_t perfdomain; + +allow test_perf_t self:capability { sys_admin }; +allow test_perf_t self:perf_event { open cpu kernel tracepoint read write }; + +################# Deny capability { sys_admin } ########################## +type test_perf_no_admin_t; +domain_type(test_perf_no_admin_t) +unconfined_runs_test(test_perf_no_admin_t) +typeattribute test_perf_no_admin_t testdomain; +typeattribute test_perf_no_admin_t perfdomain; + +allow test_perf_no_admin_t self:perf_event { open cpu kernel tracepoint read write }; + +################# Deny perf_event { open } ########################## +type test_perf_no_open_t; +domain_type(test_perf_no_open_t) +unconfined_runs_test(test_perf_no_open_t) +typeattribute test_perf_no_open_t testdomain; +typeattribute test_perf_no_open_t perfdomain; + +allow test_perf_no_open_t self:capability { sys_admin }; +allow test_perf_no_open_t self:perf_event { cpu kernel tracepoint read write }; + +################# Deny perf_event { cpu } ########################## +type test_perf_no_cpu_t; +domain_type(test_perf_no_cpu_t) +unconfined_runs_test(test_perf_no_cpu_t) +typeattribute test_perf_no_cpu_t testdomain; +typeattribute test_perf_no_cpu_t perfdomain; + +allow test_perf_no_cpu_t self:capability { sys_admin }; +allow test_perf_no_cpu_t self:perf_event { open kernel tracepoint read write }; + +################# Deny perf_event { kernel } ########################## +type test_perf_no_kernel_t; +domain_type(test_perf_no_kernel_t) +unconfined_runs_test(test_perf_no_kernel_t) +typeattribute test_perf_no_kernel_t testdomain; +typeattribute test_perf_no_kernel_t perfdomain; + +allow test_perf_no_kernel_t self:capability { sys_admin }; +allow test_perf_no_kernel_t self:perf_event { open cpu tracepoint read write }; + +################# Deny perf_event { tracepoint } ########################## +type test_perf_no_tracepoint_t; +domain_type(test_perf_no_tracepoint_t) +unconfined_runs_test(test_perf_no_tracepoint_t) +typeattribute test_perf_no_tracepoint_t testdomain; +typeattribute test_perf_no_tracepoint_t perfdomain; + +allow test_perf_no_tracepoint_t self:capability { sys_admin }; +allow test_perf_no_tracepoint_t self:perf_event { open cpu kernel read write }; + +################# Deny perf_event { read } ########################## +type test_perf_no_read_t; +domain_type(test_perf_no_read_t) +unconfined_runs_test(test_perf_no_read_t) +typeattribute test_perf_no_read_t testdomain; +typeattribute test_perf_no_read_t perfdomain; + +allow test_perf_no_read_t self:capability { sys_admin }; +allow test_perf_no_read_t self:perf_event { open cpu kernel tracepoint write }; + +################# Deny perf_event { write } ########################## +type test_perf_no_write_t; +domain_type(test_perf_no_write_t) +unconfined_runs_test(test_perf_no_write_t) +typeattribute test_perf_no_write_t testdomain; +typeattribute test_perf_no_write_t perfdomain; + +allow test_perf_no_write_t self:capability { sys_admin }; +allow test_perf_no_write_t self:perf_event { open cpu kernel tracepoint read }; + +# +########### Allow these domains to be entered from sysadm domain ############ +# +miscfiles_domain_entry_test_files(perfdomain) +userdom_sysadm_entry_spec_domtrans_to(perfdomain) diff --git a/tests/Makefile b/tests/Makefile index 0d33fbf..8f66996 100644 --- a/tests/Makefile +++ b/tests/Makefile @@ -79,6 +79,10 @@ SUBDIRS+=module_load endif endif +ifeq ($(shell grep -q perf_event $(POLDEV)/include/support/all_perms.spt && echo true),true) +SUBDIRS += perf_event +endif + ifeq ($(DISTRO),RHEL4) SUBDIRS:=$(filter-out bounds dyntrace dyntrans inet_socket mmap nnp_nosuid overlay unix_socket, $(SUBDIRS)) endif diff --git a/tests/perf_event/.gitignore b/tests/perf_event/.gitignore new file mode 100644 index 0000000..8c2f931 --- /dev/null +++ b/tests/perf_event/.gitignore @@ -0,0 +1 @@ +perf_event diff --git a/tests/perf_event/Makefile b/tests/perf_event/Makefile new file mode 100644 index 0000000..988424c --- /dev/null +++ b/tests/perf_event/Makefile @@ -0,0 +1,7 @@ +TARGETS = perf_event +LDLIBS += -lselinux + +all: $(TARGETS) + +clean: + rm -f $(TARGETS) diff --git a/tests/perf_event/perf_event.c b/tests/perf_event/perf_event.c new file mode 100644 index 0000000..8983f02 --- /dev/null +++ b/tests/perf_event/perf_event.c @@ -0,0 +1,178 @@ +#include <stdlib.h> +#include <stdio.h> +#include <unistd.h> +#include <string.h> +#include <unistd.h> +#include <errno.h> +#include <stdbool.h> +#include <asm/unistd.h> +#include <sys/mman.h> +#include <sys/ioctl.h> +#include <linux/perf_event.h> +#include <selinux/selinux.h> + +enum { + PERF_FILE_MMAP, + PERF_FILE, + PERF_MMAP +} read_type; + +static void print_usage(char *progname) +{ + fprintf(stderr, + "usage: %s [-f|-m] [-v]\n" + "Where:\n\t" + "-f Read perf_event info using read(2)\n\t" + "-m Read perf_event info using mmap(2)\n\t" + " Default is to use read(2) and mmap(2)\n\t" + "-v Print information\n", progname); + exit(-1); +} + +static long perf_event_open(struct perf_event_attr *hw_event, pid_t pid, + int cpu, int group_fd, unsigned long flags) +{ + return syscall(__NR_perf_event_open, hw_event, pid, cpu, + group_fd, flags); +} + +int main(int argc, char **argv) +{ + int opt, result, page_size, mmap_size, fd; + long long count; + bool verbose = false; + char *context; + void *base; + struct perf_event_attr pe_attr; + struct perf_event_mmap_page *pe_page; + + read_type = PERF_FILE_MMAP; + + while ((opt = getopt(argc, argv, "fmv")) != -1) { + switch (opt) { + case 'f': + read_type = PERF_FILE; + break; + case 'm': + read_type = PERF_MMAP; + break; + case 'v': + verbose = true; + break; + default: + print_usage(argv[0]); + } + } + + if (verbose) { + result = getcon(&context); + if (result < 0) { + fprintf(stderr, "Failed to obtain process context\n"); + exit(-1); + } + printf("Process context:\n\t%s\n", context); + free(context); + } + + /* Test perf_event { open cpu kernel tracepoint } */ + memset(&pe_attr, 0, sizeof(struct perf_event_attr)); + pe_attr.type = PERF_TYPE_HARDWARE | PERF_TYPE_TRACEPOINT; + pe_attr.size = sizeof(struct perf_event_attr); + pe_attr.config = PERF_COUNT_HW_INSTRUCTIONS; + pe_attr.disabled = 1; + pe_attr.exclude_hv = 1; + + fd = perf_event_open(&pe_attr, -1, 1, -1, 0); + if (fd < 0) { + fprintf(stderr, "Failed perf_event_open(): %s\n", + strerror(errno)); + if (errno == EACCES) + exit(1); + else + exit(-1); + } + + /* Test perf_event { write }; */ + result = ioctl(fd, PERF_EVENT_IOC_RESET, 0); + if (result < 0) { + fprintf(stderr, "Failed ioctl(PERF_EVENT_IOC_RESET): %s\n", + strerror(errno)); + if (errno == EACCES) + result = 2; + goto err; + } + + result = ioctl(fd, PERF_EVENT_IOC_ENABLE, 0); + if (result < 0) { + fprintf(stderr, "Failed ioctl(PERF_EVENT_IOC_ENABLE): %s\n", + strerror(errno)); + if (errno == EACCES) + result = 3; + goto err; + } + + result = ioctl(fd, PERF_EVENT_IOC_DISABLE, 0); + if (result < 0) { + fprintf(stderr, "Failed ioctl(PERF_EVENT_IOC_DISABLE): %s\n", + strerror(errno)); + if (errno == EACCES) + result = 4; + goto err; + } + + /* Test mmap(2) perf_event { read } */ + if (read_type == PERF_MMAP || read_type == PERF_FILE_MMAP) { + page_size = sysconf(_SC_PAGESIZE); + if (page_size < 0) { + fprintf(stderr, "Failed sysconf(_SC_PAGESIZE): %s\n", + strerror(errno)); + if (errno == EACCES) + result = 5; + else + result = -1; + goto err; + } + mmap_size = page_size * 2; + + base = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, + MAP_SHARED, fd, 0); + if (base == MAP_FAILED) { + fprintf(stderr, "Failed mmap(): %s\n", strerror(errno)); + if (errno == EACCES) + result = 6; + else + result = -1; + goto err; + } + + if (verbose) { + pe_page = base; + printf("perf mmap(2) return value: %lld\n", + pe_page->offset); + } + + munmap(base, mmap_size); + } + + /* Test read(2) perf_event { read } */ + if (read_type == PERF_FILE || read_type == PERF_FILE_MMAP) { + result = read(fd, &count, sizeof(long long)); + if (result < 0) { + fprintf(stderr, "Failed read(): %s\n", strerror(errno)); + if (errno == EACCES) + result = 7; + goto err; + } + + if (verbose) + printf("perf read(2) return value: %lld\n", count); + + close(fd); + } + + return 0; + +err: + close(fd); + return result; +} diff --git a/tests/perf_event/test b/tests/perf_event/test new file mode 100755 index 0000000..1c2e4a9 --- /dev/null +++ b/tests/perf_event/test @@ -0,0 +1,93 @@ +#!/usr/bin/perl +use Test::More; + +BEGIN { + $basedir = $0; + $basedir =~ s|(.*)/[^/]*|$1|; + + $test_count = 8; + $sys_admin = 0; + + # allow info to be shown during tests + $v = $ARGV[0]; + if ($v) { + if ( $v ne "-v" ) { + plan skip_all => "Invalid option (use -v)"; + } + } + else { + $v = " "; + } + + $level = `cat /proc/sys/kernel/perf_event_paranoid`; + chomp($level); + if ( $level >= 2 ) { # These tests require CAP_SYS_ADMIN + $test_count += 1; + $sys_admin = 1; + } + + if ( $v eq "-v" ) { + print "Paranoid level: $level\n"; + if ( $level < 0 ) { + print "\tNot paranoid\n"; + } + elsif ( $level eq 0 ) { + print "\tDisallow raw tracepoint/ftrace without CAP_SYS_ADMIN\n"; + } + elsif ( $level eq 1 ) { + print "\tDisallow CPU event access without CAP_SYS_ADMIN\n"; + } + elsif ( $level eq 2 ) { + print "\tDisallow kernel profiling without CAP_SYS_ADMIN\n"; + } + else { + print "\tUndefined level\n"; + } + } + + plan tests => $test_count; +} + +# perf_event { open cpu kernel tracepoint read write }; +print "Test perf_event\n"; +$result = system "runcon -t test_perf_t $basedir/perf_event $v"; +ok( $result eq 0 ); + +if ($sys_admin) { + + # Deny capability { sys_admin } - EACCES perf_event_open(2) + $result = + system "runcon -t test_perf_no_admin_t $basedir/perf_event $v 2>&1"; + ok( $result >> 8 eq 1 ); +} + +# Deny perf_event { open } - EACCES perf_event_open(2) +$result = system "runcon -t test_perf_no_open_t $basedir/perf_event $v 2>&1"; +ok( $result >> 8 eq 1 ); + +# Deny perf_event { cpu } - EACCES perf_event_open(2) +$result = system "runcon -t test_perf_no_cpu_t $basedir/perf_event $v 2>&1"; +ok( $result >> 8 eq 1 ); + +# Deny perf_event { kernel } - EACCES perf_event_open(2) +$result = system "runcon -t test_perf_no_kernel_t $basedir/perf_event $v 2>&1"; +ok( $result >> 8 eq 1 ); + +# Deny perf_event { tracepoint } - EACCES perf_event_open(2) +$result = + system "runcon -t test_perf_no_tracepoint_t $basedir/perf_event $v 2>&1"; +ok( $result >> 8 eq 1 ); + +# Deny perf_event { read } - EACCES mmap(2) +$result = system "runcon -t test_perf_no_read_t $basedir/perf_event -m $v 2>&1"; +ok( $result >> 8 eq 6 ); + +# Deny perf_event { read } - EACCES read(2) +$result = system "runcon -t test_perf_no_read_t $basedir/perf_event -f $v 2>&1"; +ok( $result >> 8 eq 7 ); + +# Deny perf_event { write } - EACCES ioctl(2) write +$result = system "runcon -t test_perf_no_write_t $basedir/perf_event $v 2>&1"; +ok( $result >> 8 eq 2 ); + +exit;
Test perf_event permissions. Signed-off-by: Richard Haines <richard_c_haines@btinternet.com> --- V2 Changes: Remove neverallows from policy Check /proc/sys/kernel/perf_event_paranoid, if < 2 then bypass the capability { sys_admin } test. V3 Changes: Remove allow_map() and device_t:chr_file rules as not required. defconfig | 6 ++ policy/Makefile | 4 + policy/test_perf_event.te | 89 +++++++++++++++++ tests/Makefile | 4 + tests/perf_event/.gitignore | 1 + tests/perf_event/Makefile | 7 ++ tests/perf_event/perf_event.c | 178 ++++++++++++++++++++++++++++++++++ tests/perf_event/test | 93 ++++++++++++++++++ 8 files changed, 382 insertions(+) create mode 100644 policy/test_perf_event.te create mode 100644 tests/perf_event/.gitignore create mode 100644 tests/perf_event/Makefile create mode 100644 tests/perf_event/perf_event.c create mode 100755 tests/perf_event/test