diff options
| author | Kawai, Hidehiro <hidehiro.kawai.ez@hitachi.com> | 2007-07-19 01:48:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-19 10:04:46 -0700 |
| commit | 6c5d523826dc639df709ed0f88c5d2ce25379652 (patch) | |
| tree | ef2fa8cb30266b3a9b047902794e78c583b099da /kernel | |
| parent | 76fdbb25f963de5dc1e308325f0578a2f92b1c2d (diff) | |
| download | linux-6c5d523826dc639df709ed0f88c5d2ce25379652.tar.bz2 | |
coredump masking: reimplementation of dumpable using two flags
This patch changes mm_struct.dumpable to a pair of bit flags.
set_dumpable() converts three-value dumpable to two flags and stores it into
lower two bits of mm_struct.flags instead of mm_struct.dumpable.
get_dumpable() behaves in the opposite way.
[akpm@linux-foundation.org: export set_dumpable]
Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: David Howells <dhowells@redhat.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/ptrace.c | 2 | ||||
| -rw-r--r-- | kernel/sys.c | 24 |
2 files changed, 13 insertions, 13 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c index 4a1745f1dadf..82a558b655da 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -142,7 +142,7 @@ static int may_attach(struct task_struct *task) return -EPERM; smp_rmb(); if (task->mm) - dumpable = task->mm->dumpable; + dumpable = get_dumpable(task->mm); if (!dumpable && !capable(CAP_SYS_PTRACE)) return -EPERM; diff --git a/kernel/sys.c b/kernel/sys.c index d40e40a9446c..08562f419768 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -1036,7 +1036,7 @@ asmlinkage long sys_setregid(gid_t rgid, gid_t egid) return -EPERM; } if (new_egid != old_egid) { - current->mm->dumpable = suid_dumpable; + set_dumpable(current->mm, suid_dumpable); smp_wmb(); } if (rgid != (gid_t) -1 || @@ -1066,13 +1066,13 @@ asmlinkage long sys_setgid(gid_t gid) if (capable(CAP_SETGID)) { if (old_egid != gid) { - current->mm->dumpable = suid_dumpable; + set_dumpable(current->mm, suid_dumpable); smp_wmb(); } current->gid = current->egid = current->sgid = current->fsgid = gid; } else if ((gid == current->gid) || (gid == current->sgid)) { if (old_egid != gid) { - current->mm->dumpable = suid_dumpable; + set_dumpable(current->mm, suid_dumpable); smp_wmb(); } current->egid = current->fsgid = gid; @@ -1103,7 +1103,7 @@ static int set_user(uid_t new_ruid, int dumpclear) switch_uid(new_user); if (dumpclear) { - current->mm->dumpable = suid_dumpable; + set_dumpable(current->mm, suid_dumpable); smp_wmb(); } current->uid = new_ruid; @@ -1159,7 +1159,7 @@ asmlinkage long sys_setreuid(uid_t ruid, uid_t euid) return -EAGAIN; if (new_euid != old_euid) { - current->mm->dumpable = suid_dumpable; + set_dumpable(current->mm, suid_dumpable); smp_wmb(); } current->fsuid = current->euid = new_euid; @@ -1209,7 +1209,7 @@ asmlinkage long sys_setuid(uid_t uid) return -EPERM; if (old_euid != uid) { - current->mm->dumpable = suid_dumpable; + set_dumpable(current->mm, suid_dumpable); smp_wmb(); } current->fsuid = current->euid = uid; @@ -1254,7 +1254,7 @@ asmlinkage long sys_setresuid(uid_t ruid, uid_t euid, uid_t suid) } if (euid != (uid_t) -1) { if (euid != current->euid) { - current->mm->dumpable = suid_dumpable; + set_dumpable(current->mm, suid_dumpable); smp_wmb(); } current->euid = euid; @@ -1304,7 +1304,7 @@ asmlinkage long sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid) } if (egid != (gid_t) -1) { if (egid != current->egid) { - current->mm->dumpable = suid_dumpable; + set_dumpable(current->mm, suid_dumpable); smp_wmb(); } current->egid = egid; @@ -1350,7 +1350,7 @@ asmlinkage long sys_setfsuid(uid_t uid) uid == current->suid || uid == current->fsuid || capable(CAP_SETUID)) { if (uid != old_fsuid) { - current->mm->dumpable = suid_dumpable; + set_dumpable(current->mm, suid_dumpable); smp_wmb(); } current->fsuid = uid; @@ -1379,7 +1379,7 @@ asmlinkage long sys_setfsgid(gid_t gid) gid == current->sgid || gid == current->fsgid || capable(CAP_SETGID)) { if (gid != old_fsgid) { - current->mm->dumpable = suid_dumpable; + set_dumpable(current->mm, suid_dumpable); smp_wmb(); } current->fsgid = gid; @@ -2176,14 +2176,14 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3, error = put_user(current->pdeath_signal, (int __user *)arg2); break; case PR_GET_DUMPABLE: - error = current->mm->dumpable; + error = get_dumpable(current->mm); break; case PR_SET_DUMPABLE: if (arg2 < 0 || arg2 > 1) { error = -EINVAL; break; } - current->mm->dumpable = arg2; + set_dumpable(current->mm, arg2); break; case PR_SET_UNALIGN: |