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diff --git a/security/sandbox/linux/SandboxFilter.cpp b/security/sandbox/linux/SandboxFilter.cpp
--- a/security/sandbox/linux/SandboxFilter.cpp
+++ b/security/sandbox/linux/SandboxFilter.cpp
@@ -1048,16 +1048,24 @@ public:
case __NR_mprotect:
case __NR_brk:
case __NR_madvise:
// libc's realloc uses mremap (Bug 1286119); wasm does too (bug 1342385).
case __NR_mremap:
return Allow();
+ // Bug 1462640: Mesa libEGL uses mincore to test whether values
+ // are pointers, for reasons.
+ case __NR_mincore: {
+ Arg<size_t> length(1);
+ return If(length == getpagesize(), Allow())
+ .Else(SandboxPolicyCommon::EvaluateSyscall(sysno));
+ }
+
case __NR_sigaltstack:
return Allow();
#ifdef __NR_set_thread_area
case __NR_set_thread_area:
return Allow();
#endif
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