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seccomp fixes for v5.10-rc5

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- Fix typos in seccomp selftests on powerpc and sh (Kees Cook)
 
 - Fix PF_SUPERPRIV audit marking in seccomp and ptrace (Mickaël Salaün)
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Merge tag 'seccomp-v5.10-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull seccomp fixes from Kees Cook:
 "This gets the seccomp selftests running again on powerpc and sh, and
  fixes an audit reporting oversight noticed in both seccomp and ptrace.

   - Fix typos in seccomp selftests on powerpc and sh (Kees Cook)

   - Fix PF_SUPERPRIV audit marking in seccomp and ptrace (Mickaël
     Salaün)"

* tag 'seccomp-v5.10-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  selftests/seccomp: sh: Fix register names
  selftests/seccomp: powerpc: Fix typo in macro variable name
  seccomp: Set PF_SUPERPRIV when checking capability
  ptrace: Set PF_SUPERPRIV when checking capability
This commit is contained in:
Linus Torvalds 2020-11-21 10:24:05 -08:00
commit ea0ab64306
3 changed files with 11 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
kernel/ptrace.c
View File

@ -264,17 +264,11 @@ static int ptrace_check_attach(struct task_struct *child, bool ignore_state)
return ret;
}
static bool ptrace_has_cap(const struct cred *cred, struct user_namespace *ns,
unsigned int mode)
static bool ptrace_has_cap(struct user_namespace *ns, unsigned int mode)
{
int ret;
if (mode & PTRACE_MODE_NOAUDIT)
ret = security_capable(cred, ns, CAP_SYS_PTRACE, CAP_OPT_NOAUDIT);
else
ret = security_capable(cred, ns, CAP_SYS_PTRACE, CAP_OPT_NONE);
return ret == 0;
return ns_capable_noaudit(ns, CAP_SYS_PTRACE);
return ns_capable(ns, CAP_SYS_PTRACE);
}
/* Returns 0 on success, -errno on denial. */
@ -326,7 +320,7 @@ static int __ptrace_may_access(struct task_struct *task, unsigned int mode)
gid_eq(caller_gid, tcred->sgid) &&
gid_eq(caller_gid, tcred->gid))
goto ok;
if (ptrace_has_cap(cred, tcred->user_ns, mode))
if (ptrace_has_cap(tcred->user_ns, mode))
goto ok;
rcu_read_unlock();
return -EPERM;
@ -345,7 +339,7 @@ static int __ptrace_may_access(struct task_struct *task, unsigned int mode)
mm = task->mm;
if (mm &&
((get_dumpable(mm) != SUID_DUMP_USER) &&
!ptrace_has_cap(cred, mm->user_ns, mode)))
!ptrace_has_cap(mm->user_ns, mode)))
return -EPERM;
return security_ptrace_access_check(task, mode);

5
kernel/seccomp.c
View File

@ -38,7 +38,7 @@
#include <linux/filter.h>
#include <linux/pid.h>
#include <linux/ptrace.h>
#include <linux/security.h>
#include <linux/capability.h>
#include <linux/tracehook.h>
#include <linux/uaccess.h>
#include <linux/anon_inodes.h>
@ -558,8 +558,7 @@ static struct seccomp_filter *seccomp_prepare_filter(struct sock_fprog *fprog)
* behavior of privileged children.
*/
if (!task_no_new_privs(current) &&
security_capable(current_cred(), current_user_ns(),
CAP_SYS_ADMIN, CAP_OPT_NOAUDIT) != 0)
!ns_capable_noaudit(current_user_ns(), CAP_SYS_ADMIN))
return ERR_PTR(-EACCES);
/* Allocate a new seccomp_filter */

8
tools/testing/selftests/seccomp/seccomp_bpf.c
View File

@ -1758,10 +1758,10 @@ TEST_F(TRACE_poke, getpid_runs_normally)
* and the code is stored as a positive value. \
*/ \
if (_result < 0) { \
SYSCALL_RET(_regs) = -result; \
SYSCALL_RET(_regs) = -_result; \
(_regs).ccr |= 0x10000000; \
} else { \
SYSCALL_RET(_regs) = result; \
SYSCALL_RET(_regs) = _result; \
(_regs).ccr &= ~0x10000000; \
} \
} while (0)
@ -1804,8 +1804,8 @@ TEST_F(TRACE_poke, getpid_runs_normally)
#define SYSCALL_RET(_regs) (_regs).a[(_regs).windowbase * 4 + 2]
#elif defined(__sh__)
# define ARCH_REGS struct pt_regs
# define SYSCALL_NUM(_regs) (_regs).gpr[3]
# define SYSCALL_RET(_regs) (_regs).gpr[0]
# define SYSCALL_NUM(_regs) (_regs).regs[3]
# define SYSCALL_RET(_regs) (_regs).regs[0]
#else
# error "Do not know how to find your architecture's registers and syscalls"
#endif