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proc: support proc-empty-vm test on i386
Unmap everything starting from 4GB length until it unmaps, otherwise test has to detect which virtual memory split kernel is using. Link: https://lkml.kernel.org/r/20230630183434.17434-1-adobriyan@gmail.com Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Björn Töpel <bjorn@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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1 changed files with 16 additions and 0 deletions
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@ -37,6 +37,10 @@
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#include <sys/wait.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <unistd.h>
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#ifdef __amd64__
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#define TEST_VSYSCALL
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#endif
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/*
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/*
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* 0: vsyscall VMA doesn't exist vsyscall=none
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* 0: vsyscall VMA doesn't exist vsyscall=none
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* 1: vsyscall VMA is --xp vsyscall=xonly
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* 1: vsyscall VMA is --xp vsyscall=xonly
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@ -119,6 +123,7 @@ static void sigaction_SIGSEGV(int _, siginfo_t *__, void *___)
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_exit(EXIT_FAILURE);
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_exit(EXIT_FAILURE);
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}
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}
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#ifdef TEST_VSYSCALL
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static void sigaction_SIGSEGV_vsyscall(int _, siginfo_t *__, void *___)
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static void sigaction_SIGSEGV_vsyscall(int _, siginfo_t *__, void *___)
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{
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{
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_exit(g_vsyscall);
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_exit(g_vsyscall);
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@ -170,6 +175,7 @@ static void vsyscall(void)
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exit(1);
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exit(1);
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}
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}
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}
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}
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#endif
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static int test_proc_pid_maps(pid_t pid)
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static int test_proc_pid_maps(pid_t pid)
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{
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{
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@ -299,7 +305,9 @@ int main(void)
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{
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{
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int rv = EXIT_SUCCESS;
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int rv = EXIT_SUCCESS;
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#ifdef TEST_VSYSCALL
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vsyscall();
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vsyscall();
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#endif
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switch (g_vsyscall) {
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switch (g_vsyscall) {
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case 0:
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case 0:
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@ -346,6 +354,14 @@ int main(void)
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#ifdef __amd64__
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#ifdef __amd64__
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munmap(NULL, ((size_t)1 << 47) - 4096);
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munmap(NULL, ((size_t)1 << 47) - 4096);
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#elif defined __i386__
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{
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size_t len;
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for (len = -4096;; len -= 4096) {
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munmap(NULL, len);
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}
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}
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#else
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#else
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#error "implement 'unmap everything'"
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#error "implement 'unmap everything'"
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#endif
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#endif
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