diff options
| -rw-r--r-- | NOFORK_NOEXEC.lst | 2 | ||||
| -rw-r--r-- | procps/free.c | 51 |
2 files changed, 24 insertions, 29 deletions
diff --git a/NOFORK_NOEXEC.lst b/NOFORK_NOEXEC.lst index 4e53d72..72c33dd 100644 --- a/NOFORK_NOEXEC.lst +++ b/NOFORK_NOEXEC.lst @@ -144,7 +144,7 @@ flash_unlock - hardware flashcp - hardware flock - spawner, changes state (file locks), let's play safe and not be noexec fold - noexec. runner -free - noexec. nofork candidate(struct globals, needs to close /proc/meminfo fd) +free - NOFORK freeramdisk - noexec. leaks: open+ioctl_or_perror_and_die fsck - interactive, longterm fsck.minix - needs ^C diff --git a/procps/free.c b/procps/free.c index b57e4a3..fa423cf 100644 --- a/procps/free.c +++ b/procps/free.c @@ -15,7 +15,7 @@ //config: memory in the system, as well as the buffers used by the kernel. //config: The shared memory column should be ignored; it is obsolete. -//applet:IF_FREE(APPLET_NOEXEC(free, free, BB_DIR_USR_BIN, BB_SUID_DROP, free)) +//applet:IF_FREE(APPLET_NOFORK(free, free, BB_DIR_USR_BIN, BB_SUID_DROP, free)) //kbuild:lib-$(CONFIG_FREE) += free.o @@ -40,25 +40,21 @@ struct globals { unsigned mem_unit; #if ENABLE_DESKTOP - unsigned unit_steps; -# define G_unit_steps G.unit_steps + uint8_t unit_steps; +# define G_unit_steps g->unit_steps #else # define G_unit_steps 10 #endif -} FIX_ALIASING; -#define G (*(struct globals*)bb_common_bufsiz1) -#define INIT_G() do { \ - setup_common_bufsiz(); \ - /* NB: noexec applet - globals not zeroed */ \ -} while (0) +}; +/* Because of NOFORK, "globals" are not in global data */ - -static unsigned long long scale(unsigned long d) +static unsigned long long scale(struct globals *g, unsigned long d) { - return ((unsigned long long)d * G.mem_unit) >> G_unit_steps; + return ((unsigned long long)d * g->mem_unit) >> G_unit_steps; } -static unsigned long parse_cached_kb(void) +/* NOINLINE reduces main() stack usage, which makes code smaller (on x86 at least) */ +static NOINLINE unsigned long parse_cached_kb(void) { char buf[60]; /* actual lines we expect are ~30 chars or less */ FILE *fp; @@ -69,8 +65,8 @@ static unsigned long parse_cached_kb(void) if (sscanf(buf, "Cached: %lu %*s\n", &cached) == 1) break; } - if (ENABLE_FEATURE_CLEAN_UP) - fclose(fp); + /* Have to close because of NOFORK */ + fclose(fp); return cached; } @@ -78,11 +74,10 @@ static unsigned long parse_cached_kb(void) int free_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int free_main(int argc UNUSED_PARAM, char **argv IF_NOT_DESKTOP(UNUSED_PARAM)) { + struct globals G; struct sysinfo info; unsigned long long cached; - INIT_G(); - #if ENABLE_DESKTOP G.unit_steps = 10; if (argv[1] && argv[1][0] == '-') { @@ -123,12 +118,12 @@ int free_main(int argc UNUSED_PARAM, char **argv IF_NOT_DESKTOP(UNUSED_PARAM)) #define FIELDS_2 (FIELDS_6 + 4*6) printf(FIELDS_6, - scale(info.totalram), //total - scale(info.totalram - info.freeram), //used - scale(info.freeram), //free - scale(info.sharedram), //shared - scale(info.bufferram), //buffers - scale(cached) //cached + scale(&G, info.totalram), //total + scale(&G, info.totalram - info.freeram), //used + scale(&G, info.freeram), //free + scale(&G, info.sharedram), //shared + scale(&G, info.bufferram), //buffers + scale(&G, cached) //cached ); /* Show alternate, more meaningful busy/free numbers by counting * buffer cache as free memory. */ @@ -136,15 +131,15 @@ int free_main(int argc UNUSED_PARAM, char **argv IF_NOT_DESKTOP(UNUSED_PARAM)) cached += info.freeram; cached += info.bufferram; printf(FIELDS_2, - scale(info.totalram - cached), //used - scale(cached) //free + scale(&G, info.totalram - cached), //used + scale(&G, cached) //free ); #if BB_MMU printf("Swap: "); printf(FIELDS_3, - scale(info.totalswap), //total - scale(info.totalswap - info.freeswap), //used - scale(info.freeswap) //free + scale(&G, info.totalswap), //total + scale(&G, info.totalswap - info.freeswap), //used + scale(&G, info.freeswap) //free ); #endif return EXIT_SUCCESS; |