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sysctl: require CAP_SYS_RAWIO to set mmap_min_addr

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Currently the mmap_min_addr value can only be bypassed during mmap when
the task has CAP_SYS_RAWIO.  However, the mmap_min_addr sysctl value itself
can be adjusted to 0 if euid == 0, allowing a bypass without CAP_SYS_RAWIO.
This patch adds a check for the capability before allowing mmap_min_addr to
be changed.

Signed-off-by: Kees Cook <kees.cook@canonical.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Kees Cook 2009-11-08 09:37:00 -08:00 committed by James Morris
parent 31bde71c20
commit 0e1a6ef2de
1 changed files with 3 additions and 0 deletions
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3
security/min_addr.c
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@ -33,6 +33,9 @@ int mmap_min_addr_handler(struct ctl_table *table, int write,
{ {
int ret; int ret;
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
ret = proc_doulongvec_minmax(table, write, buffer, lenp, ppos); ret = proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
update_mmap_min_addr(); update_mmap_min_addr();