Messages in this thread Patch in this message | | | From | Pierre Carrier <> | Subject | [PATCH 1/1] procfs: expose umask in stat and status | Date | Sat, 5 May 2012 04:50:27 +0200 |
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A new stat field uses decimal, contains umask or -ENOENT if !task->fs. A new status line is displayed if task->fs, and uses octal.
Signed-off-by: Pierre Carrier <pierre@spotify.com> --- Tested shortly.
$ awk '{print $NF}' /proc/1/stat 18 $ grep Umask /proc/1/status Umask: 022 $ umask 077 $ grep Umask /proc/$$/status Umask: 077 $ umask 0 $ grep Umask /proc/$$/status Umask: 00
Documentation/filesystems/proc.txt | 2 ++ fs/proc/array.c | 24 +++++++++++++++++++++++- 2 files changed, 25 insertions(+), 1 deletion(-)
diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt index b7413cb..aa33543 100644 --- a/Documentation/filesystems/proc.txt +++ b/Documentation/filesystems/proc.txt @@ -212,6 +212,7 @@ Table 1-2: Contents of the status files (as of 2.6.30-rc7) TracerPid PID of process tracing this process (0 if not) Uid Real, effective, saved set, and file system UIDs Gid Real, effective, saved set, and file system GIDs + Umask file mode creation mask FDSize number of file descriptor slots currently allocated Groups supplementary group list VmPeak peak virtual memory size @@ -310,6 +311,7 @@ Table 1-4: Contents of the stat files (as of 2.6.30-rc7) start_data address above which program data+bss is placed end_data address below which program data+bss is placed start_brk address above which program heap can be expanded with brk() + umask file creation mode mask .............................................................................. The /proc/PID/maps file containing the currently mapped memory regions and diff --git a/fs/proc/array.c b/fs/proc/array.c index f9bd395..5e7d5df 100644 --- a/fs/proc/array.c +++ b/fs/proc/array.c @@ -81,6 +81,7 @@ #include <linux/pid_namespace.h> #include <linux/ptrace.h> #include <linux/tracehook.h> +#include <linux/fs_struct.h> #include <asm/pgtable.h> #include <asm/processor.h> @@ -158,11 +159,24 @@ static inline const char *get_task_state(struct task_struct *tsk) return *p; } +static inline int get_task_umask(struct task_struct *tsk) +{ + struct fs_struct *fs; + int umask = -ENOENT; + + task_lock(tsk); + fs = tsk->fs; + if (fs) + umask = fs->umask; + task_unlock(tsk); + return umask; +} + static inline void task_state(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *p) { struct group_info *group_info; - int g; + int g, umask; struct fdtable *fdt = NULL; const struct cred *cred; pid_t ppid, tpid; @@ -192,6 +206,10 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns, cred->uid, cred->euid, cred->suid, cred->fsuid, cred->gid, cred->egid, cred->sgid, cred->fsgid); + umask = get_task_umask(p); + if (umask >= 0) + seq_printf(m, "Umask:\t0%o\n", umask); + task_lock(p); if (p->files) fdt = files_fdtable(p->files); @@ -368,6 +386,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, pid_t ppid = 0, pgid = -1, sid = -1; int num_threads = 0; int permitted; + int umask; struct mm_struct *mm; unsigned long long start_time; unsigned long cmin_flt = 0, cmaj_flt = 0; @@ -462,6 +481,8 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, /* convert nsec -> ticks */ start_time = nsec_to_clock_t(start_time); + umask = get_task_umask(task); + seq_printf(m, "%d (%s) %c", pid_nr_ns(pid, ns), tcomm, state); seq_put_decimal_ll(m, ' ', ppid); seq_put_decimal_ll(m, ' ', pgid); @@ -511,6 +532,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, seq_put_decimal_ull(m, ' ', (mm && permitted) ? mm->start_data : 0); seq_put_decimal_ull(m, ' ', (mm && permitted) ? mm->end_data : 0); seq_put_decimal_ull(m, ' ', (mm && permitted) ? mm->start_brk : 0); + seq_put_decimal_ll(m, ' ', umask); seq_putc(m, '\n'); if (mm) mmput(mm); -- 1.7.10.1
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