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coredump masking: reimplementation of dumpable using two flags

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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>
This commit is contained in:
Kawai, Hidehiro
2007-07-19 01:48:27 -07:00
committed by Linus Torvalds
parent 76fdbb25f9
commit 6c5d523826
8 changed files with 82 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
kernel/ptrace.c
View File

@@ -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;

24
kernel/sys.c
View File

@@ -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: