diff options
Diffstat (limited to 'kernel/timer.c')
| -rw-r--r-- | kernel/timer.c | 70 |
1 files changed, 69 insertions, 1 deletions
diff --git a/kernel/timer.c b/kernel/timer.c index dbf7a78a1ef1..06b3245624e2 100644 --- a/kernel/timer.c +++ b/kernel/timer.c @@ -41,6 +41,7 @@ #include <linux/sched.h> #include <linux/sched/sysctl.h> #include <linux/slab.h> +#include <linux/compat.h> #include <asm/uaccess.h> #include <asm/unistd.h> @@ -1567,7 +1568,7 @@ SYSCALL_DEFINE0(gettid) * do_sysinfo - fill in sysinfo struct * @info: pointer to buffer to fill */ -int do_sysinfo(struct sysinfo *info) +static int do_sysinfo(struct sysinfo *info) { unsigned long mem_total, sav_total; unsigned int mem_unit, bitcount; @@ -1642,6 +1643,73 @@ SYSCALL_DEFINE1(sysinfo, struct sysinfo __user *, info) return 0; } +#ifdef CONFIG_COMPAT +struct compat_sysinfo { + s32 uptime; + u32 loads[3]; + u32 totalram; + u32 freeram; + u32 sharedram; + u32 bufferram; + u32 totalswap; + u32 freeswap; + u16 procs; + u16 pad; + u32 totalhigh; + u32 freehigh; + u32 mem_unit; + char _f[20-2*sizeof(u32)-sizeof(int)]; +}; + +asmlinkage long +compat_sys_sysinfo(struct compat_sysinfo __user *info) +{ + struct sysinfo s; + + do_sysinfo(&s); + + /* Check to see if any memory value is too large for 32-bit and scale + * down if needed + */ + if ((s.totalram >> 32) || (s.totalswap >> 32)) { + int bitcount = 0; + + while (s.mem_unit < PAGE_SIZE) { + s.mem_unit <<= 1; + bitcount++; + } + + s.totalram >>= bitcount; + s.freeram >>= bitcount; + s.sharedram >>= bitcount; + s.bufferram >>= bitcount; + s.totalswap >>= bitcount; + s.freeswap >>= bitcount; + s.totalhigh >>= bitcount; + s.freehigh >>= bitcount; + } + + if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) || + __put_user (s.uptime, &info->uptime) || + __put_user (s.loads[0], &info->loads[0]) || + __put_user (s.loads[1], &info->loads[1]) || + __put_user (s.loads[2], &info->loads[2]) || + __put_user (s.totalram, &info->totalram) || + __put_user (s.freeram, &info->freeram) || + __put_user (s.sharedram, &info->sharedram) || + __put_user (s.bufferram, &info->bufferram) || + __put_user (s.totalswap, &info->totalswap) || + __put_user (s.freeswap, &info->freeswap) || + __put_user (s.procs, &info->procs) || + __put_user (s.totalhigh, &info->totalhigh) || + __put_user (s.freehigh, &info->freehigh) || + __put_user (s.mem_unit, &info->mem_unit)) + return -EFAULT; + + return 0; +} +#endif /* CONFIG_COMPAT */ + static int __cpuinit init_timers_cpu(int cpu) { int j; |