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| author | Kees Cook <keescook@chromium.org> | 2012-04-04 11:40:19 -0700 |
|---|---|---|
| committer | James Morris <james.l.morris@oracle.com> | 2012-04-05 14:51:43 +1000 |
| commit | 620f6e8e855d6d447688a5f67a4e176944a084e8 (patch) | |
| tree | 2be8f032eefc0d3bdaf9a045bd9263da4a2c6823 /kernel/sysctl.c | |
| parent | 6c216ec636f75d834461be15f83ec41a6759bd2b (diff) | |
| download | linux-620f6e8e855d6d447688a5f67a4e176944a084e8.tar.gz linux-620f6e8e855d6d447688a5f67a4e176944a084e8.tar.bz2 linux-620f6e8e855d6d447688a5f67a4e176944a084e8.zip | |
sysctl: fix write access to dmesg_restrict/kptr_restrict
Commit bfdc0b4 adds code to restrict access to dmesg_restrict,
however, it incorrectly alters kptr_restrict rather than
dmesg_restrict.
The original patch from Richard Weinberger
(https://lkml.org/lkml/2011/3/14/362) alters dmesg_restrict as
expected, and so the patch seems to have been misapplied.
This adds the CAP_SYS_ADMIN check to both dmesg_restrict and
kptr_restrict, since both are sensitive.
Reported-by: Phillip Lougher <plougher@redhat.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Acked-by: Richard Weinberger <richard@nod.at>
Cc: stable@vger.kernel.org
Signed-off-by: James Morris <james.l.morris@oracle.com>
Diffstat (limited to 'kernel/sysctl.c')
| -rw-r--r-- | kernel/sysctl.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 52b3a06a02f8..4ab11879aeb4 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -170,7 +170,7 @@ static int proc_taint(struct ctl_table *table, int write, #endif #ifdef CONFIG_PRINTK -static int proc_dmesg_restrict(struct ctl_table *table, int write, +static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos); #endif @@ -703,7 +703,7 @@ static struct ctl_table kern_table[] = { .data = &dmesg_restrict, .maxlen = sizeof(int), .mode = 0644, - .proc_handler = proc_dointvec_minmax, + .proc_handler = proc_dointvec_minmax_sysadmin, .extra1 = &zero, .extra2 = &one, }, @@ -712,7 +712,7 @@ static struct ctl_table kern_table[] = { .data = &kptr_restrict, .maxlen = sizeof(int), .mode = 0644, - .proc_handler = proc_dmesg_restrict, + .proc_handler = proc_dointvec_minmax_sysadmin, .extra1 = &zero, .extra2 = &two, }, @@ -1943,7 +1943,7 @@ static int proc_taint(struct ctl_table *table, int write, } #ifdef CONFIG_PRINTK -static int proc_dmesg_restrict(struct ctl_table *table, int write, +static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { if (write && !capable(CAP_SYS_ADMIN)) |