commit 055d92f8673c9e2bc284a5976e69664c87f18cae
author Tobias Koch <tobias.koch@nonterra.com> Thu Mar 05 21:24:00 2020 +0100
committer Laurent Vivier <laurent@vivier.eu> Fri Mar 20 15:51:54 2020 +0100
tree 96dbdb7026a55afa36ad09eb4decc6d6ed064e50
parent e0d1673d39c1768f5372a43771d3776354eb3f96

linux-user: do prlimit selectively

Analogous to what commit 5dfa88f7 did for setrlimit, this commit
selectively ignores limits for memory-related resources in prlimit64
calls. This is to prevent too restrictive limits from causing QEMU
itself to malfunction.

Signed-off-by: Tobias Koch <tobias.koch@nonterra.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20200305202400.27574-1-tobias.koch@nonterra.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

linux-user/syscall.c

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 8d27d10..4f2f9eb 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -11871,7 +11871,10 @@
         struct target_rlimit64 *target_rnew, *target_rold;
         struct host_rlimit64 rnew, rold, *rnewp = 0;
         int resource = target_to_host_resource(arg2);
-        if (arg3) {
+
+        if (arg3 && (resource != RLIMIT_AS &&
+                     resource != RLIMIT_DATA &&
+                     resource != RLIMIT_STACK)) {
             if (!lock_user_struct(VERIFY_READ, target_rnew, arg3, 1)) {
                 return -TARGET_EFAULT;
             }