544ee752cd
setrlimit is supposed to be per-process, not per-thread, but again linux gets it wrong. work around this in userspace. not only is it needed for correctness; setxid also depends on the resource limits for all threads being the same to avoid situations where temporarily unlimiting the limit succeeds in some threads but fails in others.
36 lines
657 B
C
36 lines
657 B
C
#include <sys/resource.h>
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#include <errno.h>
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#include "syscall.h"
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#include "libc.h"
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int __setrlimit(int resource, const struct rlimit *rlim)
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{
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long k_rlim[2] = { rlim->rlim_cur, rlim->rlim_max };
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return __syscall(SYS_setrlimit, resource, k_rlim);
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}
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struct ctx {
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const struct rlimit *rlim;
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int res;
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int err;
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};
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static void do_setrlimit(void *p)
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{
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struct ctx *c = p;
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if (c->err) return;
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c->err = -__setrlimit(c->res, c->rlim);
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}
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int setrlimit(int resource, const struct rlimit *rlim)
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{
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struct ctx c = { .res = resource, .rlim = rlim };
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__synccall(do_setrlimit, &c);
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if (c.err) {
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errno = c.err;
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return -1;
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}
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return 0;
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}
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LFS64(setrlimit);
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