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110 lines
3.0 KiB
110 lines
3.0 KiB
From db3d91905e245c7495df8991a9c054b6d4e0dc98 Mon Sep 17 00:00:00 2001
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From: Jiri Slaby <jirislaby@gmail.com>
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Date: Wed, 26 Aug 2009 21:24:30 +0200
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Subject: [PATCH] FS: proc, make limits writable
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References: FATE#305733
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Patch-mainline: no (later)
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Allow writing strings such as
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Max core file size=0:unlimited
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to /proc/<pid>/limits to change limits.
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Signed-off-by: Jiri Slaby <jslaby@suse.cz>
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---
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fs/proc/base.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++++++--
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1 file changed, 66 insertions(+), 2 deletions(-)
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--- a/fs/proc/base.c
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+++ b/fs/proc/base.c
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@@ -536,8 +536,72 @@ static ssize_t limits_read(struct file *
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return count;
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}
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+static ssize_t limits_write(struct file *file, const char __user *buf,
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+ size_t count, loff_t *ppos)
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+{
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+ struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
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+ char str[32 + 1 + 16 + 1 + 16 + 1], *delim, *next;
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+ struct rlimit new_rlimit;
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+ unsigned int i;
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+ int ret;
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+
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+ if (!task) {
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+ count = -ESRCH;
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+ goto out;
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+ }
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+ if (copy_from_user(str, buf, min(count, sizeof(str) - 1))) {
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+ count = -EFAULT;
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+ goto put_task;
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+ }
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+
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+ str[min(count, sizeof(str) - 1)] = 0;
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+
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+ delim = strchr(str, '=');
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+ if (!delim) {
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+ count = -EINVAL;
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+ goto put_task;
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+ }
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+ *delim++ = 0; /* for easy 'str' usage */
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+ new_rlimit.rlim_cur = simple_strtoul(delim, &next, 0);
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+ if (*next != ':') {
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+ if (strncmp(delim, "unlimited:", 10)) {
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+ count = -EINVAL;
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+ goto put_task;
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+ }
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+ new_rlimit.rlim_cur = RLIM_INFINITY;
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+ next = delim + 9; /* move to ':' */
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+ }
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+ delim = next + 1;
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+ new_rlimit.rlim_max = simple_strtoul(delim, &next, 0);
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+ if (*next != 0) {
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+ if (strcmp(delim, "unlimited")) {
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+ count = -EINVAL;
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+ goto put_task;
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+ }
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+ new_rlimit.rlim_max = RLIM_INFINITY;
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+ }
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+
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+ for (i = 0; i < RLIM_NLIMITS; i++)
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+ if (!strcmp(str, lnames[i].name))
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+ break;
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+ if (i >= RLIM_NLIMITS) {
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+ count = -EINVAL;
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+ goto put_task;
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+ }
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+
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+ ret = do_setrlimit(task, i, &new_rlimit);
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+ if (ret)
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+ count = ret;
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+
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+put_task:
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+ put_task_struct(task);
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+out:
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+ return count;
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+}
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+
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static const struct file_operations proc_pid_limits_operations = {
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.read = limits_read,
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+ .write = limits_write,
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};
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#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
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@@ -2596,7 +2660,7 @@ static const struct pid_entry tgid_base_
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INF("auxv", S_IRUSR, proc_pid_auxv),
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ONE("status", S_IRUGO, proc_pid_status),
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ONE("personality", S_IRUSR, proc_pid_personality),
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- REG("limits", S_IRUSR, proc_pid_limits_operations),
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+ REG("limits", S_IRUSR|S_IWUSR, proc_pid_limits_operations),
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#ifdef CONFIG_SCHED_DEBUG
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REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
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#endif
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@@ -2931,7 +2995,7 @@ static const struct pid_entry tid_base_s
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INF("auxv", S_IRUSR, proc_pid_auxv),
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ONE("status", S_IRUGO, proc_pid_status),
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ONE("personality", S_IRUSR, proc_pid_personality),
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- REG("limits", S_IRUSR, proc_pid_limits_operations),
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+ REG("limits", S_IRUSR|S_IWUSR, proc_pid_limits_operations),
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#ifdef CONFIG_SCHED_DEBUG
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REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
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#endif
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