Marcus Meissner
947bf1c982
CVE-2021-4034-pkexec-fix.patch OBS-URL: https://build.opensuse.org/package/show/Base:System/polkit?expand=0&rev=167
66 lines
1.5 KiB
Diff
66 lines
1.5 KiB
Diff
--- a/src/programs/pkcheck.c
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+++ a/src/programs/pkcheck.c
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@@ -363,6 +363,12 @@ main (int argc, char *argv[])
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local_agent_handle = NULL;
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ret = 126;
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+ if (argc < 1)
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+ {
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+ help();
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+ exit(1);
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+ }
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+
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/* Disable remote file access from GIO. */
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setenv ("GIO_USE_VFS", "local", 1);
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--- a/src/programs/pkexec.c
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+++ a/src/programs/pkexec.c
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@@ -488,6 +488,17 @@ main (int argc, char *argv[])
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pid_t pid_of_caller;
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gpointer local_agent_handle;
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+
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+ /*
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+ * If 'pkexec' is called wrong, just show help and bail out.
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+ */
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+ if (argc<1)
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+ {
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+ clearenv();
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+ usage(argc, argv);
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+ exit(1);
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+ }
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+
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ret = 127;
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authority = NULL;
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subject = NULL;
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@@ -614,10 +625,10 @@ main (int argc, char *argv[])
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path = g_strdup (pwstruct.pw_shell);
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if (!path)
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- {
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+ {
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g_printerr ("No shell configured or error retrieving pw_shell\n");
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goto out;
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- }
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+ }
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/* If you change this, be sure to change the if (!command_line)
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case below too */
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command_line = g_strdup (path);
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@@ -636,7 +647,15 @@ main (int argc, char *argv[])
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goto out;
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}
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g_free (path);
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- argv[n] = path = s;
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+ path = s;
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+
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+ /* argc<2 and pkexec runs just shell, argv is guaranteed to be null-terminated.
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+ * /-less shell shouldn't happen, but let's be defensive and don't write to null-termination
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+ */
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+ if (argv[n] != NULL)
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+ {
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+ argv[n] = path;
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+ }
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}
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if (access (path, F_OK) != 0)
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{
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