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authorLuis Chamberlain <mcgrof@kernel.org>2022-01-21 22:13:17 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2022-01-22 08:33:36 +0200
commit66ad398634c21e0a42ce10002ae06c39352da0d1 (patch)
treefc094c2f911eb38d2e59389e8c2f1a711c95bc70 /fs
parent9c011be132972ff94bde2ae99064e29f94e85c68 (diff)
fs: move fs/exec.c sysctls into its own file
kernel/sysctl.c is a kitchen sink where everyone leaves their dirty dishes, this makes it very difficult to maintain. To help with this maintenance let's start by moving sysctls to places where they actually belong. The proc sysctl maintainers do not want to know what sysctl knobs you wish to add for your own piece of code, we just care about the core logic. So move the fs/exec.c respective sysctls to its own file. Since checkpatch complains about style issues with the old code, this move also fixes a few of those minor style issues: * Use pr_warn() instead of prink(WARNING * New empty lines are wanted at the beginning of routines Link: https://lkml.kernel.org/r/20211129205548.605569-9-mcgrof@kernel.org Signed-off-by: Luis Chamberlain <mcgrof@kernel.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Antti Palosaari <crope@iki.fi> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Iurii Zaikin <yzaikin@google.com> Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: Jeff Layton <jlayton@kernel.org> Cc: Kees Cook <keescook@chromium.org> Cc: Lukas Middendorf <kernel@tuxforce.de> Cc: Stephen Kitt <steve@sk2.org> Cc: Xiaoming Ni <nixiaoming@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/exec.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/fs/exec.c b/fs/exec.c
index 3c3c366a9bcf..310750340e4a 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -65,6 +65,7 @@
#include <linux/vmalloc.h>
#include <linux/io_uring.h>
#include <linux/syscall_user_dispatch.h>
+#include <linux/coredump.h>
#include <linux/uaccess.h>
#include <asm/mmu_context.h>
@@ -2099,3 +2100,92 @@ COMPAT_SYSCALL_DEFINE5(execveat, int, fd,
argv, envp, flags);
}
#endif
+
+#ifdef CONFIG_SYSCTL
+
+static void validate_coredump_safety(void)
+{
+#ifdef CONFIG_COREDUMP
+ if (suid_dumpable == SUID_DUMP_ROOT &&
+ core_pattern[0] != '/' && core_pattern[0] != '|') {
+ pr_warn(
+"Unsafe core_pattern used with fs.suid_dumpable=2.\n"
+"Pipe handler or fully qualified core dump path required.\n"
+"Set kernel.core_pattern before fs.suid_dumpable.\n"
+ );
+ }
+#endif
+}
+
+static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+
+ if (!error)
+ validate_coredump_safety();
+ return error;
+}
+
+static struct ctl_table fs_exec_sysctls[] = {
+ {
+ .procname = "suid_dumpable",
+ .data = &suid_dumpable,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax_coredump,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_TWO,
+ },
+ { }
+};
+
+#ifdef CONFIG_COREDUMP
+
+static int proc_dostring_coredump(struct ctl_table *table, int write,
+ void *buffer, size_t *lenp, loff_t *ppos)
+{
+ int error = proc_dostring(table, write, buffer, lenp, ppos);
+
+ if (!error)
+ validate_coredump_safety();
+ return error;
+}
+
+static struct ctl_table kernel_exec_sysctls[] = {
+ {
+ .procname = "core_uses_pid",
+ .data = &core_uses_pid,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "core_pattern",
+ .data = core_pattern,
+ .maxlen = CORENAME_MAX_SIZE,
+ .mode = 0644,
+ .proc_handler = proc_dostring_coredump,
+ },
+ {
+ .procname = "core_pipe_limit",
+ .data = &core_pipe_limit,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ { }
+};
+#endif
+
+static int __init init_fs_exec_sysctls(void)
+{
+ register_sysctl_init("fs", fs_exec_sysctls);
+#ifdef CONFIG_COREDUMP
+ register_sysctl_init("kernel", kernel_exec_sysctls);
+#endif
+ return 0;
+}
+
+fs_initcall(init_fs_exec_sysctls);
+#endif /* CONFIG_SYSCTL */