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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2005-06-23 03:09:43 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-23 12:45:26 -0400
commitd6e711448137ca3301512cec41a2c2ce852b3d0a (patch)
treef0765ebd90fdbdf270c05fcd7f3d32b24ba56681 /fs/proc/base.c
parent8b0914ea7475615c7c8965c1ac8fe4069270f25c (diff)
[PATCH] setuid core dump
Add a new `suid_dumpable' sysctl: This value can be used to query and set the core dump mode for setuid or otherwise protected/tainted binaries. The modes are 0 - (default) - traditional behaviour. Any process which has changed privilege levels or is execute only will not be dumped 1 - (debug) - all processes dump core when possible. The core dump is owned by the current user and no security is applied. This is intended for system debugging situations only. Ptrace is unchecked. 2 - (suidsafe) - any binary which normally would not be dumped is dumped readable by root only. This allows the end user to remove such a dump but not access it directly. For security reasons core dumps in this mode will not overwrite one another or other files. This mode is appropriate when adminstrators are attempting to debug problems in a normal environment. (akpm: > > +EXPORT_SYMBOL(suid_dumpable); > > EXPORT_SYMBOL_GPL? No problem to me. > > if (current->euid == current->uid && current->egid == current->gid) > > current->mm->dumpable = 1; > > Should this be SUID_DUMP_USER? Actually the feedback I had from last time was that the SUID_ defines should go because its clearer to follow the numbers. They can go everywhere (and there are lots of places where dumpable is tested/used as a bool in untouched code) > Maybe this should be renamed to `dump_policy' or something. Doing that > would help us catch any code which isn't using the #defines, too. Fair comment. The patch was designed to be easy to maintain for Red Hat rather than for merging. Changing that field would create a gigantic diff because it is used all over the place. ) Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/proc/base.c')
-rw-r--r--fs/proc/base.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index e31903aadd96..ace151fa4878 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -314,7 +314,7 @@ static int may_ptrace_attach(struct task_struct *task)
314 (current->gid != task->gid)) && !capable(CAP_SYS_PTRACE)) 314 (current->gid != task->gid)) && !capable(CAP_SYS_PTRACE))
315 goto out; 315 goto out;
316 rmb(); 316 rmb();
317 if (!task->mm->dumpable && !capable(CAP_SYS_PTRACE)) 317 if (task->mm->dumpable != 1 && !capable(CAP_SYS_PTRACE))
318 goto out; 318 goto out;
319 if (security_ptrace(current, task)) 319 if (security_ptrace(current, task))
320 goto out; 320 goto out;
@@ -1113,7 +1113,9 @@ static int task_dumpable(struct task_struct *task)
1113 if (mm) 1113 if (mm)
1114 dumpable = mm->dumpable; 1114 dumpable = mm->dumpable;
1115 task_unlock(task); 1115 task_unlock(task);
1116 return dumpable; 1116 if(dumpable == 1)
1117 return 1;
1118 return 0;
1117} 1119}
1118 1120
1119 1121