diff options
author | Stephen Rothwell <sfr@canb.auug.org.au> | 2010-03-12 14:08:35 +1100 |
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committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2010-03-12 14:08:35 +1100 |
commit | 237e9f18c4c9ab5b039dc22aa35ce22db431b2ac (patch) | |
tree | 797e067437cbca1d5d81251f8fe09613405563b7 /fs | |
parent | c9a30aabbb215c3767d682e73343afd14418633d (diff) | |
parent | 57158a0fd4c9e29b403d422ac820cf238066cedf (diff) |
Merge remote branch 'limits/writable_limits'
Conflicts:
arch/x86/ia32/ia32entry.S
arch/x86/include/asm/unistd_32.h
arch/x86/include/asm/unistd_64.h
arch/x86/kernel/syscall_table_32.S
Diffstat (limited to 'fs')
-rw-r--r-- | fs/proc/base.c | 101 |
1 files changed, 92 insertions, 9 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index a7310841c831..13e34084d57c 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -477,19 +477,30 @@ static const struct limit_names lnames[RLIM_NLIMITS] = { }; /* Display limits for a process */ -static int proc_pid_limits(struct task_struct *task, char *buffer) +static ssize_t limits_read(struct file *file, char __user *buf, size_t rcount, + loff_t *ppos) { - unsigned int i; - int count = 0; - unsigned long flags; - char *bufptr = buffer; - struct rlimit rlim[RLIM_NLIMITS]; + struct task_struct *task; + unsigned long flags; + unsigned int i; + ssize_t count = 0; + char *bufptr; - if (!lock_task_sighand(task, &flags)) + task = get_proc_task(file->f_path.dentry->d_inode); + if (!task) + return -ESRCH; + if (!lock_task_sighand(task, &flags)) { + put_task_struct(task); return 0; + } memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); unlock_task_sighand(task, &flags); + put_task_struct(task); + + bufptr = (char *)__get_free_page(GFP_TEMPORARY); + if (!bufptr) + return -ENOMEM; /* * print the file header @@ -518,9 +529,81 @@ static int proc_pid_limits(struct task_struct *task, char *buffer) count += sprintf(&bufptr[count], "\n"); } + count = simple_read_from_buffer(buf, rcount, ppos, bufptr, count); + + free_page((unsigned long)bufptr); + + return count; +} + +static ssize_t limits_write(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) +{ + struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); + char str[32 + 1 + 16 + 1 + 16 + 1], *delim, *next; + struct rlimit new_rlimit; + unsigned int i; + int ret; + + if (!task) { + count = -ESRCH; + goto out; + } + if (copy_from_user(str, buf, min(count, sizeof(str) - 1))) { + count = -EFAULT; + goto put_task; + } + + str[min(count, sizeof(str) - 1)] = 0; + + delim = strchr(str, '='); + if (!delim) { + count = -EINVAL; + goto put_task; + } + *delim++ = 0; /* for easy 'str' usage */ + new_rlimit.rlim_cur = simple_strtoul(delim, &next, 0); + if (*next != ':') { + if (strncmp(delim, "unlimited:", 10)) { + count = -EINVAL; + goto put_task; + } + new_rlimit.rlim_cur = RLIM_INFINITY; + next = delim + 9; /* move to ':' */ + } + delim = next + 1; + new_rlimit.rlim_max = simple_strtoul(delim, &next, 0); + if (*next != 0) { + if (strcmp(delim, "unlimited")) { + count = -EINVAL; + goto put_task; + } + new_rlimit.rlim_max = RLIM_INFINITY; + } + + for (i = 0; i < RLIM_NLIMITS; i++) + if (!strcmp(str, lnames[i].name)) + break; + if (i >= RLIM_NLIMITS) { + count = -EINVAL; + goto put_task; + } + + ret = do_setrlimit(task, i, &new_rlimit); + if (ret) + count = ret; + +put_task: + put_task_struct(task); +out: return count; } +static const struct file_operations proc_pid_limits_operations = { + .read = limits_read, + .write = limits_write, +}; + #ifdef CONFIG_HAVE_ARCH_TRACEHOOK static int proc_pid_syscall(struct task_struct *task, char *buffer) { @@ -2577,7 +2660,7 @@ static const struct pid_entry tgid_base_stuff[] = { INF("auxv", S_IRUSR, proc_pid_auxv), ONE("status", S_IRUGO, proc_pid_status), ONE("personality", S_IRUSR, proc_pid_personality), - INF("limits", S_IRUSR, proc_pid_limits), + REG("limits", S_IRUSR|S_IWUSR, proc_pid_limits_operations), #ifdef CONFIG_SCHED_DEBUG REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), #endif @@ -2912,7 +2995,7 @@ static const struct pid_entry tid_base_stuff[] = { INF("auxv", S_IRUSR, proc_pid_auxv), ONE("status", S_IRUGO, proc_pid_status), ONE("personality", S_IRUSR, proc_pid_personality), - INF("limits", S_IRUSR, proc_pid_limits), + REG("limits", S_IRUSR|S_IWUSR, proc_pid_limits_operations), #ifdef CONFIG_SCHED_DEBUG REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), #endif |