[tor-commits] [tor/maint-0.3.0] Permit the fchmod system call.

[nickm@xxxxxxxxxxxxxx]

commit 59f29970fa78bec8c01bd5f16edca8c24b8724f5
Author: Nick Mathewson <nickm@xxxxxxxxxxxxxx>
Date:   Fri Jun 16 14:03:02 2017 -0400

    Permit the fchmod system call.
    
    Fixes bug 22516; bugfix on 0.2.5.4-alpha.
---
 changes/bug22516     | 5 +++++
 src/common/sandbox.c | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/changes/bug22516 b/changes/bug22516
new file mode 100644
index 0000000..f024a3c
--- /dev/null
+++ b/changes/bug22516
@@ -0,0 +1,5 @@
+  o Minor bugfixes (linux seccomp2 sandbox):
+    - Permit the fchmod system call, to avoid crashing on startup when
+      starting with the seccomp2 sandbox and an unexpected set of permissions
+      on the data directory or its contents. Fixes bug 22516; bugfix on
+      0.2.5.4-alpha.
diff --git a/src/common/sandbox.c b/src/common/sandbox.c
index 95c9f83..da96ad8 100644
--- a/src/common/sandbox.c
+++ b/src/common/sandbox.c
@@ -136,6 +136,9 @@ static int filter_nopar_gen[] = {
 #ifdef HAVE_PIPE
     SCMP_SYS(pipe),
 #endif
+#ifdef __NR_fchmod
+    SCMP_SYS(fchmod),
+#endif
     SCMP_SYS(fcntl),
     SCMP_SYS(fstat),
 #ifdef __NR_fstat64



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