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kerndat: add madvise(MADV_GUARD_INSTALL) feature-detection

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Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
This commit is contained in:
Alexander Mikhalitsyn 2025-04-19 20:37:48 +02:00 committed by Radostin Stoyanov
parent 91847a6181
commit 54c078e6c2
2 changed files with 33 additions and 0 deletions
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1
criu/include/kerndat.h
View File

@ -91,6 +91,7 @@ struct kerndat_s {
bool has_close_range; bool has_close_range;
bool has_timer_cr_ids; bool has_timer_cr_ids;
bool has_breakpoints; bool has_breakpoints;
bool has_madv_guard;
}; };
extern struct kerndat_s kdat; extern struct kerndat_s kdat;

32
criu/kerndat.c
View File

@ -31,6 +31,7 @@
#include "kerndat.h" #include "kerndat.h"
#include "fs-magic.h" #include "fs-magic.h"
#include "mem.h" #include "mem.h"
#include "mman.h"
#include "common/compiler.h" #include "common/compiler.h"
#include "sysctl.h" #include "sysctl.h"
#include "cr_options.h" #include "cr_options.h"
@ -1813,6 +1814,33 @@ err:
return exit_code; return exit_code;
} }
static int kerndat_has_madv_guard(void)
{
void *map;
map = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
if (map == MAP_FAILED) {
pr_perror("Can't mmap a page for has_madv_guard feature test");
return -1;
}
if (madvise(map, PAGE_SIZE, MADV_GUARD_INSTALL)) {
if (errno != EINVAL) {
pr_perror("madvise failed (has_madv_guard check)");
goto mmap_cleanup;
}
} else {
kdat.has_madv_guard = true;
}
munmap(map, PAGE_SIZE);
return 0;
mmap_cleanup:
munmap(map, PAGE_SIZE);
return -1;
}
/* /*
* Some features depend on resource that can be dynamically changed * Some features depend on resource that can be dynamically changed
* at the OS runtime. There are cases that we cannot determine the * at the OS runtime. There are cases that we cannot determine the
@ -2081,6 +2109,10 @@ int kerndat_init(void)
pr_err("kerndat_breakpoints has failed when initializing kerndat.\n"); pr_err("kerndat_breakpoints has failed when initializing kerndat.\n");
ret = -1; ret = -1;
} }
if (!ret && kerndat_has_madv_guard()) {
pr_err("kerndat_has_madv_guard has failed when initializing kerndat.\n");
ret = -1;
}
kerndat_lsm(); kerndat_lsm();
kerndat_mmap_min_addr(); kerndat_mmap_min_addr();