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commit 2a6b8307fa4243a7921270aedf8ce6506e31569a
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Author: Steve Dickson <steved@redhat.com>
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Date: Tue Jul 17 15:09:37 2018 -0400
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rpc.gssd: truncates 32-bit UIDs/GIDs to 16 bits architectures.
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utils/gssd_proc.c uses SYS_setresuid and SYS_setresgid in
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change_identity when it should use SYS_setresuid32 and
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SYS_setresgid32 instead. This causes it to truncate
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UIDs/GIDs > 65536.
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Fixes: https://bugs.launchpad.net/ubuntu/+source/nfs-utils/+bug/1779962
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Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1595927
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Tested-by: James Ettle <theholyettlz@googlemail.com>
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Tested-by: Sree <Sree@gmail.com>
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Signed-off-by: Steve Dickson <steved@redhat.com>
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diff --git a/utils/gssd/gssd_proc.c b/utils/gssd/gssd_proc.c
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index 8767e26..7a57c4e 100644
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--- a/utils/gssd/gssd_proc.c
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+++ b/utils/gssd/gssd_proc.c
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@@ -434,6 +434,7 @@ static int
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change_identity(uid_t uid)
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{
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struct passwd *pw;
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+ int res;
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/* drop list of supplimentary groups first */
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if (syscall(SYS_setgroups, 0, 0) != 0) {
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@@ -459,14 +460,23 @@ change_identity(uid_t uid)
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* send a signal to all other threads to synchronize the uid in all
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* other threads. To bypass this, we have to call syscall() directly.
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*/
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- if (syscall(SYS_setresgid, pw->pw_gid, pw->pw_gid, pw->pw_gid) != 0) {
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+#ifdef __NR_setresuid32
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+ res = syscall(SYS_setresgid32, pw->pw_gid, pw->pw_gid, pw->pw_gid);
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+#else
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+ res = syscall(SYS_setresgid, pw->pw_gid, pw->pw_gid, pw->pw_gid);
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+#endif
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+ if (res != 0) {
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printerr(0, "WARNING: failed to set gid to %u!\n", pw->pw_gid);
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return errno;
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}
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- if (syscall(SYS_setresuid, uid, uid, uid) != 0) {
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- printerr(0, "WARNING: Failed to setuid for user with uid %u\n",
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- uid);
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+#ifdef __NR_setresuid32
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+ res = syscall(SYS_setresuid32, uid, uid, uid);
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+#else
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+ res = syscall(SYS_setresuid, uid, uid, uid);
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+#endif
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+ if (res != 0) {
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+ printerr(0, "WARNING: Failed to setuid for user with uid %u\n", uid);
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return errno;
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}
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