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crypto/rand: add syscall number fallbacks in seccomp_linux #75658

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crypto/rand: add syscall number fallbacks in seccomp_linux #75658

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crypto/rand: add syscall number fallbacks in seccomp_linux
dougm Sep 26, 2025
412c349
crypto/rand: early return from disable_getrandom when fallbacks are used
dougm Sep 30, 2025
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11 changes: 11 additions & 0 deletions src/crypto/internal/sysrand/internal/seccomp/seccomp_linux.go
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Original file line number Diff line number Diff line change
Expand Up @@ -49,7 +49,18 @@ struct seccomp_data {
#define SECCOMP_RET_ALLOW 0x7fff0000U
#define SECCOMP_SET_MODE_FILTER 1

#ifndef SYS_getrandom
#define SYS_getrandom -1
#endif

#ifndef SYS_seccomp
#define SYS_seccomp -1
#endif

int disable_getrandom() {
if (SYS_getrandom == -1 || SYS_seccomp == -1) {
return 3;
}
if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
return 1;
}
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