| Message ID | f5f1a4d8699613f8c02ce762807228c841c2e26f.1621363275.git.rgb@redhat.com (mailing list archive) |
|---|---|
| State | Awaiting Upstream, archived |
| Headers | show |
| Series | audit: add support for openat2 | expand |
On Wed, May 19, 2021 at 04:00:21PM -0400, Richard Guy Briggs wrote: > The openat2(2) syscall was added in kernel v5.6 with commit fddb5d430ad9 > ("open: introduce openat2(2) syscall") > > Add the openat2(2) syscall to the audit syscall classifier. > > Link: https://github.com/linux-audit/audit-kernel/issues/67 > Signed-off-by: Richard Guy Briggs <rgb@redhat.com> > Link: https://lore.kernel.org/r/f5f1a4d8699613f8c02ce762807228c841c2e26f.1621363275.git.rgb@redhat.com > --- > arch/alpha/kernel/audit.c | 2 ++ > arch/ia64/kernel/audit.c | 2 ++ > arch/parisc/kernel/audit.c | 2 ++ > arch/parisc/kernel/compat_audit.c | 2 ++ > arch/powerpc/kernel/audit.c | 2 ++ > arch/powerpc/kernel/compat_audit.c | 2 ++ > arch/s390/kernel/audit.c | 2 ++ > arch/s390/kernel/compat_audit.c | 2 ++ > arch/sparc/kernel/audit.c | 2 ++ > arch/sparc/kernel/compat_audit.c | 2 ++ > arch/x86/ia32/audit.c | 2 ++ > arch/x86/kernel/audit_64.c | 2 ++ > include/linux/auditsc_classmacros.h | 1 + > kernel/auditsc.c | 3 +++ > lib/audit.c | 4 ++++ > lib/compat_audit.c | 4 ++++ > 16 files changed, 36 insertions(+) > > diff --git a/arch/alpha/kernel/audit.c b/arch/alpha/kernel/audit.c > index 81cbd804e375..3ab04709784a 100644 > --- a/arch/alpha/kernel/audit.c > +++ b/arch/alpha/kernel/audit.c > @@ -42,6 +42,8 @@ int audit_classify_syscall(int abi, unsigned syscall) > return AUDITSC_OPENAT; > case __NR_execve: > return AUDITSC_EXECVE; > + case __NR_openat2: > + return AUDITSC_OPENAT2; > default: > return AUDITSC_NATIVE; > } > diff --git a/arch/ia64/kernel/audit.c b/arch/ia64/kernel/audit.c > index dba6a74c9ab3..ec61f20ca61f 100644 > --- a/arch/ia64/kernel/audit.c > +++ b/arch/ia64/kernel/audit.c > @@ -43,6 +43,8 @@ int audit_classify_syscall(int abi, unsigned syscall) > return AUDITSC_OPENAT; > case __NR_execve: > return AUDITSC_EXECVE; > + case __NR_openat2: > + return AUDITSC_OPENAT2; > default: > return AUDITSC_NATIVE; > } > diff --git a/arch/parisc/kernel/audit.c b/arch/parisc/kernel/audit.c > index 14244e83db75..f420b5552140 100644 > --- a/arch/parisc/kernel/audit.c > +++ b/arch/parisc/kernel/audit.c > @@ -52,6 +52,8 @@ int audit_classify_syscall(int abi, unsigned syscall) > return AUDITSC_OPENAT; > case __NR_execve: > return AUDITSC_EXECVE; > + case __NR_openat2: > + return AUDITSC_OPENAT2; > default: > return AUDITSC_NATIVE; > } > diff --git a/arch/parisc/kernel/compat_audit.c b/arch/parisc/kernel/compat_audit.c > index 1d6347d37d92..3ec490c28656 100644 > --- a/arch/parisc/kernel/compat_audit.c > +++ b/arch/parisc/kernel/compat_audit.c > @@ -36,6 +36,8 @@ int parisc32_classify_syscall(unsigned syscall) > return AUDITSC_OPENAT; > case __NR_execve: > return AUDITSC_EXECVE; > + case __NR_openat2: > + return AUDITSC_OPENAT2; > default: > return AUDITSC_COMPAT; > } > diff --git a/arch/powerpc/kernel/audit.c b/arch/powerpc/kernel/audit.c > index 6eb18ef77dff..1bcfca5fdf67 100644 > --- a/arch/powerpc/kernel/audit.c > +++ b/arch/powerpc/kernel/audit.c > @@ -54,6 +54,8 @@ int audit_classify_syscall(int abi, unsigned syscall) > return AUDITSC_SOCKETCALL; > case __NR_execve: > return AUDITSC_EXECVE; > + case __NR_openat2: > + return AUDITSC_OPENAT2; > default: > return AUDITSC_NATIVE; > } > diff --git a/arch/powerpc/kernel/compat_audit.c b/arch/powerpc/kernel/compat_audit.c > index b1dc2d1c4bad..251abf79d536 100644 > --- a/arch/powerpc/kernel/compat_audit.c > +++ b/arch/powerpc/kernel/compat_audit.c > @@ -39,6 +39,8 @@ int ppc32_classify_syscall(unsigned syscall) > return AUDITSC_SOCKETCALL; > case __NR_execve: > return AUDITSC_EXECVE; > + case __NR_openat2: > + return AUDITSC_OPENAT2; > default: > return AUDITSC_COMPAT; > } > diff --git a/arch/s390/kernel/audit.c b/arch/s390/kernel/audit.c > index 7e331e1831d4..02051a596b87 100644 > --- a/arch/s390/kernel/audit.c > +++ b/arch/s390/kernel/audit.c > @@ -54,6 +54,8 @@ int audit_classify_syscall(int abi, unsigned syscall) > return AUDITSC_SOCKETCALL; > case __NR_execve: > return AUDITSC_EXECVE; > + case __NR_openat2: > + return AUDITSC_OPENAT2; > default: > return AUDITSC_NATIVE; > } > diff --git a/arch/s390/kernel/compat_audit.c b/arch/s390/kernel/compat_audit.c > index fc3d1c7ad21c..4b3d463e7d97 100644 > --- a/arch/s390/kernel/compat_audit.c > +++ b/arch/s390/kernel/compat_audit.c > @@ -40,6 +40,8 @@ int s390_classify_syscall(unsigned syscall) > return AUDITSC_SOCKETCALL; > case __NR_execve: > return AUDITSC_EXECVE; > + case __NR_openat2: > + return AUDITSC_OPENAT2; > default: > return AUDITSC_COMPAT; > } > diff --git a/arch/sparc/kernel/audit.c b/arch/sparc/kernel/audit.c > index 50fab35bdaba..b092274eca79 100644 > --- a/arch/sparc/kernel/audit.c > +++ b/arch/sparc/kernel/audit.c > @@ -55,6 +55,8 @@ int audit_classify_syscall(int abi, unsigned int syscall) > return AUDITSC_SOCKETCALL; > case __NR_execve: > return AUDITSC_EXECVE; > + case __NR_openat2: > + return AUDITSC_OPENAT2; > default: > return AUDITSC_NATIVE; > } > diff --git a/arch/sparc/kernel/compat_audit.c b/arch/sparc/kernel/compat_audit.c > index 1c1b6d075421..2a3f71206fc5 100644 > --- a/arch/sparc/kernel/compat_audit.c > +++ b/arch/sparc/kernel/compat_audit.c > @@ -40,6 +40,8 @@ int sparc32_classify_syscall(unsigned int syscall) > return AUDITSC_SOCKETCALL; > case __NR_execve: > return AUDITSC_EXECVE; > + case __NR_openat2: > + return AUDITSC_OPENAT2; > default: > return AUDITSC_COMPAT; > } > diff --git a/arch/x86/ia32/audit.c b/arch/x86/ia32/audit.c > index eedc37a1ee13..efc7d832fefb 100644 > --- a/arch/x86/ia32/audit.c > +++ b/arch/x86/ia32/audit.c > @@ -40,6 +40,8 @@ int ia32_classify_syscall(unsigned syscall) > case __NR_execve: > case __NR_execveat: > return AUDITSC_EXECVE; > + case __NR_openat2: > + return AUDITSC_OPENAT2; > default: > return AUDITSC_COMPAT; > } > diff --git a/arch/x86/kernel/audit_64.c b/arch/x86/kernel/audit_64.c > index 2a6cc9c9c881..44c3601cfdc4 100644 > --- a/arch/x86/kernel/audit_64.c > +++ b/arch/x86/kernel/audit_64.c > @@ -53,6 +53,8 @@ int audit_classify_syscall(int abi, unsigned syscall) > case __NR_execve: > case __NR_execveat: > return AUDITSC_EXECVE; > + case __NR_openat2: > + return AUDITSC_OPENAT2; > default: > return AUDITSC_NATIVE; > } > diff --git a/include/linux/auditsc_classmacros.h b/include/linux/auditsc_classmacros.h > index 18757d270961..dc8e72536dbd 100644 > --- a/include/linux/auditsc_classmacros.h > +++ b/include/linux/auditsc_classmacros.h > @@ -16,6 +16,7 @@ enum auditsc_class_t { > AUDITSC_OPENAT, > AUDITSC_SOCKETCALL, > AUDITSC_EXECVE, > + AUDITSC_OPENAT2, > > AUDITSC_NVALS /* count */ > }; > diff --git a/kernel/auditsc.c b/kernel/auditsc.c > index d775ea16505b..3f59ab209dfd 100644 > --- a/kernel/auditsc.c > +++ b/kernel/auditsc.c > @@ -76,6 +76,7 @@ > #include <linux/fsnotify_backend.h> > #include <uapi/linux/limits.h> > #include <uapi/linux/netfilter/nf_tables.h> > +#include <uapi/linux/openat2.h> > > #include "audit.h" > > @@ -196,6 +197,8 @@ static int audit_match_perm(struct audit_context *ctx, int mask) > return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND); > case AUDITSC_EXECVE: > return mask & AUDIT_PERM_EXEC; > + case AUDITSC_OPENAT2: > + return mask & ACC_MODE((u32)((struct open_how *)ctx->argv[2])->flags); That's a lot of dereferncing, casting and masking all at once. Maybe a small static inline helper would be good for the sake of legibility? Sm like: static inline u32 audit_openat2_acc(struct open_how *how, int mask) { u32 flags = how->flags; return mask & ACC_MODE(flags); } but not sure. Just seems more legible to me. Otherwise. Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
On Thu, May 20, 2021 at 3:58 AM Christian Brauner <christian.brauner@ubuntu.com> wrote: > On Wed, May 19, 2021 at 04:00:21PM -0400, Richard Guy Briggs wrote: > > The openat2(2) syscall was added in kernel v5.6 with commit fddb5d430ad9 > > ("open: introduce openat2(2) syscall") > > > > Add the openat2(2) syscall to the audit syscall classifier. > > > > Link: https://github.com/linux-audit/audit-kernel/issues/67 > > Signed-off-by: Richard Guy Briggs <rgb@redhat.com> > > Link: https://lore.kernel.org/r/f5f1a4d8699613f8c02ce762807228c841c2e26f.1621363275.git.rgb@redhat.com > > --- > > arch/alpha/kernel/audit.c | 2 ++ > > arch/ia64/kernel/audit.c | 2 ++ > > arch/parisc/kernel/audit.c | 2 ++ > > arch/parisc/kernel/compat_audit.c | 2 ++ > > arch/powerpc/kernel/audit.c | 2 ++ > > arch/powerpc/kernel/compat_audit.c | 2 ++ > > arch/s390/kernel/audit.c | 2 ++ > > arch/s390/kernel/compat_audit.c | 2 ++ > > arch/sparc/kernel/audit.c | 2 ++ > > arch/sparc/kernel/compat_audit.c | 2 ++ > > arch/x86/ia32/audit.c | 2 ++ > > arch/x86/kernel/audit_64.c | 2 ++ > > include/linux/auditsc_classmacros.h | 1 + > > kernel/auditsc.c | 3 +++ > > lib/audit.c | 4 ++++ > > lib/compat_audit.c | 4 ++++ > > 16 files changed, 36 insertions(+) ... > > diff --git a/kernel/auditsc.c b/kernel/auditsc.c > > index d775ea16505b..3f59ab209dfd 100644 > > --- a/kernel/auditsc.c > > +++ b/kernel/auditsc.c > > @@ -76,6 +76,7 @@ > > #include <linux/fsnotify_backend.h> > > #include <uapi/linux/limits.h> > > #include <uapi/linux/netfilter/nf_tables.h> > > +#include <uapi/linux/openat2.h> > > > > #include "audit.h" > > > > @@ -196,6 +197,8 @@ static int audit_match_perm(struct audit_context *ctx, int mask) > > return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND); > > case AUDITSC_EXECVE: > > return mask & AUDIT_PERM_EXEC; > > + case AUDITSC_OPENAT2: > > + return mask & ACC_MODE((u32)((struct open_how *)ctx->argv[2])->flags); > > That's a lot of dereferncing, casting and masking all at once. Maybe a > small static inline helper would be good for the sake of legibility? Sm > like: > > static inline u32 audit_openat2_acc(struct open_how *how, int mask) > { > u32 flags = how->flags; > return mask & ACC_MODE(flags); > } > > but not sure. Just seems more legible to me. > Otherwise. I'm on the fence about this. I understand Christian's concern, but I have a bit of hatred towards single caller functions like this. Since this function isn't really high-touch, and I don't expect that to change in the near future, let's leave the casting mess as-is.
diff --git a/arch/alpha/kernel/audit.c b/arch/alpha/kernel/audit.c index 81cbd804e375..3ab04709784a 100644 --- a/arch/alpha/kernel/audit.c +++ b/arch/alpha/kernel/audit.c @@ -42,6 +42,8 @@ int audit_classify_syscall(int abi, unsigned syscall) return AUDITSC_OPENAT; case __NR_execve: return AUDITSC_EXECVE; + case __NR_openat2: + return AUDITSC_OPENAT2; default: return AUDITSC_NATIVE; } diff --git a/arch/ia64/kernel/audit.c b/arch/ia64/kernel/audit.c index dba6a74c9ab3..ec61f20ca61f 100644 --- a/arch/ia64/kernel/audit.c +++ b/arch/ia64/kernel/audit.c @@ -43,6 +43,8 @@ int audit_classify_syscall(int abi, unsigned syscall) return AUDITSC_OPENAT; case __NR_execve: return AUDITSC_EXECVE; + case __NR_openat2: + return AUDITSC_OPENAT2; default: return AUDITSC_NATIVE; } diff --git a/arch/parisc/kernel/audit.c b/arch/parisc/kernel/audit.c index 14244e83db75..f420b5552140 100644 --- a/arch/parisc/kernel/audit.c +++ b/arch/parisc/kernel/audit.c @@ -52,6 +52,8 @@ int audit_classify_syscall(int abi, unsigned syscall) return AUDITSC_OPENAT; case __NR_execve: return AUDITSC_EXECVE; + case __NR_openat2: + return AUDITSC_OPENAT2; default: return AUDITSC_NATIVE; } diff --git a/arch/parisc/kernel/compat_audit.c b/arch/parisc/kernel/compat_audit.c index 1d6347d37d92..3ec490c28656 100644 --- a/arch/parisc/kernel/compat_audit.c +++ b/arch/parisc/kernel/compat_audit.c @@ -36,6 +36,8 @@ int parisc32_classify_syscall(unsigned syscall) return AUDITSC_OPENAT; case __NR_execve: return AUDITSC_EXECVE; + case __NR_openat2: + return AUDITSC_OPENAT2; default: return AUDITSC_COMPAT; } diff --git a/arch/powerpc/kernel/audit.c b/arch/powerpc/kernel/audit.c index 6eb18ef77dff..1bcfca5fdf67 100644 --- a/arch/powerpc/kernel/audit.c +++ b/arch/powerpc/kernel/audit.c @@ -54,6 +54,8 @@ int audit_classify_syscall(int abi, unsigned syscall) return AUDITSC_SOCKETCALL; case __NR_execve: return AUDITSC_EXECVE; + case __NR_openat2: + return AUDITSC_OPENAT2; default: return AUDITSC_NATIVE; } diff --git a/arch/powerpc/kernel/compat_audit.c b/arch/powerpc/kernel/compat_audit.c index b1dc2d1c4bad..251abf79d536 100644 --- a/arch/powerpc/kernel/compat_audit.c +++ b/arch/powerpc/kernel/compat_audit.c @@ -39,6 +39,8 @@ int ppc32_classify_syscall(unsigned syscall) return AUDITSC_SOCKETCALL; case __NR_execve: return AUDITSC_EXECVE; + case __NR_openat2: + return AUDITSC_OPENAT2; default: return AUDITSC_COMPAT; } diff --git a/arch/s390/kernel/audit.c b/arch/s390/kernel/audit.c index 7e331e1831d4..02051a596b87 100644 --- a/arch/s390/kernel/audit.c +++ b/arch/s390/kernel/audit.c @@ -54,6 +54,8 @@ int audit_classify_syscall(int abi, unsigned syscall) return AUDITSC_SOCKETCALL; case __NR_execve: return AUDITSC_EXECVE; + case __NR_openat2: + return AUDITSC_OPENAT2; default: return AUDITSC_NATIVE; } diff --git a/arch/s390/kernel/compat_audit.c b/arch/s390/kernel/compat_audit.c index fc3d1c7ad21c..4b3d463e7d97 100644 --- a/arch/s390/kernel/compat_audit.c +++ b/arch/s390/kernel/compat_audit.c @@ -40,6 +40,8 @@ int s390_classify_syscall(unsigned syscall) return AUDITSC_SOCKETCALL; case __NR_execve: return AUDITSC_EXECVE; + case __NR_openat2: + return AUDITSC_OPENAT2; default: return AUDITSC_COMPAT; } diff --git a/arch/sparc/kernel/audit.c b/arch/sparc/kernel/audit.c index 50fab35bdaba..b092274eca79 100644 --- a/arch/sparc/kernel/audit.c +++ b/arch/sparc/kernel/audit.c @@ -55,6 +55,8 @@ int audit_classify_syscall(int abi, unsigned int syscall) return AUDITSC_SOCKETCALL; case __NR_execve: return AUDITSC_EXECVE; + case __NR_openat2: + return AUDITSC_OPENAT2; default: return AUDITSC_NATIVE; } diff --git a/arch/sparc/kernel/compat_audit.c b/arch/sparc/kernel/compat_audit.c index 1c1b6d075421..2a3f71206fc5 100644 --- a/arch/sparc/kernel/compat_audit.c +++ b/arch/sparc/kernel/compat_audit.c @@ -40,6 +40,8 @@ int sparc32_classify_syscall(unsigned int syscall) return AUDITSC_SOCKETCALL; case __NR_execve: return AUDITSC_EXECVE; + case __NR_openat2: + return AUDITSC_OPENAT2; default: return AUDITSC_COMPAT; } diff --git a/arch/x86/ia32/audit.c b/arch/x86/ia32/audit.c index eedc37a1ee13..efc7d832fefb 100644 --- a/arch/x86/ia32/audit.c +++ b/arch/x86/ia32/audit.c @@ -40,6 +40,8 @@ int ia32_classify_syscall(unsigned syscall) case __NR_execve: case __NR_execveat: return AUDITSC_EXECVE; + case __NR_openat2: + return AUDITSC_OPENAT2; default: return AUDITSC_COMPAT; } diff --git a/arch/x86/kernel/audit_64.c b/arch/x86/kernel/audit_64.c index 2a6cc9c9c881..44c3601cfdc4 100644 --- a/arch/x86/kernel/audit_64.c +++ b/arch/x86/kernel/audit_64.c @@ -53,6 +53,8 @@ int audit_classify_syscall(int abi, unsigned syscall) case __NR_execve: case __NR_execveat: return AUDITSC_EXECVE; + case __NR_openat2: + return AUDITSC_OPENAT2; default: return AUDITSC_NATIVE; } diff --git a/include/linux/auditsc_classmacros.h b/include/linux/auditsc_classmacros.h index 18757d270961..dc8e72536dbd 100644 --- a/include/linux/auditsc_classmacros.h +++ b/include/linux/auditsc_classmacros.h @@ -16,6 +16,7 @@ enum auditsc_class_t { AUDITSC_OPENAT, AUDITSC_SOCKETCALL, AUDITSC_EXECVE, + AUDITSC_OPENAT2, AUDITSC_NVALS /* count */ }; diff --git a/kernel/auditsc.c b/kernel/auditsc.c index d775ea16505b..3f59ab209dfd 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -76,6 +76,7 @@ #include <linux/fsnotify_backend.h> #include <uapi/linux/limits.h> #include <uapi/linux/netfilter/nf_tables.h> +#include <uapi/linux/openat2.h> #include "audit.h" @@ -196,6 +197,8 @@ static int audit_match_perm(struct audit_context *ctx, int mask) return ((mask & AUDIT_PERM_WRITE) && ctx->argv[0] == SYS_BIND); case AUDITSC_EXECVE: return mask & AUDIT_PERM_EXEC; + case AUDITSC_OPENAT2: + return mask & ACC_MODE((u32)((struct open_how *)ctx->argv[2])->flags); default: return 0; } diff --git a/lib/audit.c b/lib/audit.c index 3ec1a94d8d64..738bda22dd39 100644 --- a/lib/audit.c +++ b/lib/audit.c @@ -60,6 +60,10 @@ int audit_classify_syscall(int abi, unsigned syscall) #endif case __NR_execve: return AUDITSC_EXECVE; +#ifdef __NR_openat2 + case __NR_openat2: + return AUDITSC_OPENAT2; +#endif default: return AUDITSC_NATIVE; } diff --git a/lib/compat_audit.c b/lib/compat_audit.c index a38b282d353f..e2a0f914d8b6 100644 --- a/lib/compat_audit.c +++ b/lib/compat_audit.c @@ -46,6 +46,10 @@ int audit_classify_compat_syscall(int abi, unsigned syscall) #endif case __NR_execve: return AUDITSC_EXECVE; +#ifdef __NR_openat2 + case __NR_openat2: + return AUDITSC_OPENAT2; +#endif default: return AUDITSC_COMPAT; }
The openat2(2) syscall was added in kernel v5.6 with commit fddb5d430ad9 ("open: introduce openat2(2) syscall") Add the openat2(2) syscall to the audit syscall classifier. Link: https://github.com/linux-audit/audit-kernel/issues/67 Signed-off-by: Richard Guy Briggs <rgb@redhat.com> Link: https://lore.kernel.org/r/f5f1a4d8699613f8c02ce762807228c841c2e26f.1621363275.git.rgb@redhat.com --- arch/alpha/kernel/audit.c | 2 ++ arch/ia64/kernel/audit.c | 2 ++ arch/parisc/kernel/audit.c | 2 ++ arch/parisc/kernel/compat_audit.c | 2 ++ arch/powerpc/kernel/audit.c | 2 ++ arch/powerpc/kernel/compat_audit.c | 2 ++ arch/s390/kernel/audit.c | 2 ++ arch/s390/kernel/compat_audit.c | 2 ++ arch/sparc/kernel/audit.c | 2 ++ arch/sparc/kernel/compat_audit.c | 2 ++ arch/x86/ia32/audit.c | 2 ++ arch/x86/kernel/audit_64.c | 2 ++ include/linux/auditsc_classmacros.h | 1 + kernel/auditsc.c | 3 +++ lib/audit.c | 4 ++++ lib/compat_audit.c | 4 ++++ 16 files changed, 36 insertions(+)