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bpfLoader: automatically bump ringbuffer size up to page size am: 8a117a374b am: 1cba4021bf am: f9ff12af51

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Original change: https://android-review.googlesource.com/c/platform/system/bpf/+/2628969

Change-Id: If461fcd3618862d696d38dd7b048bb5ed7fddadc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
This commit is contained in:
Maciej Żenczykowski 2023-06-20 21:56:44 +00:00 committed by Automerger Merge Worker
commit a284f6434e
1 changed files with 16 additions and 4 deletions
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20
libbpf_android/Loader.cpp
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@ -31,13 +31,13 @@
#include <sys/wait.h>
#include <unistd.h>
// This is BpfLoader v0.39
// This is BpfLoader v0.40
// WARNING: If you ever hit cherrypick conflicts here you're doing it wrong:
// You are NOT allowed to cherrypick bpfloader related patches out of order.
// (indeed: cherrypicking is probably a bad idea and you should merge instead)
// Mainline supports ONLY the published versions of the bpfloader for each Android release.
#define BPFLOADER_VERSION_MAJOR 0u
#define BPFLOADER_VERSION_MINOR 39u
#define BPFLOADER_VERSION_MINOR 40u
#define BPFLOADER_VERSION ((BPFLOADER_VERSION_MAJOR << 16) | BPFLOADER_VERSION_MINOR)
#include "BpfSyscallWrappers.h"
@ -95,6 +95,8 @@ const std::string& getBuildType() {
return t;
}
static unsigned int page_size = static_cast<unsigned int>(getpagesize());
constexpr const char* lookupSelinuxContext(const domain d, const char* const unspecified = "") {
switch (d) {
case domain::unspecified: return unspecified;
@ -705,6 +707,11 @@ static bool mapMatchesExpectations(const unique_fd& fd, const string& mapName,
if (type == BPF_MAP_TYPE_DEVMAP || type == BPF_MAP_TYPE_DEVMAP_HASH)
desired_map_flags |= BPF_F_RDONLY_PROG;
unsigned int desired_max_entries = mapDef.max_entries;
if (type == BPF_MAP_TYPE_RINGBUF) {
if (desired_max_entries < page_size) desired_max_entries = page_size;
}
// The following checks should *never* trigger, if one of them somehow does,
// it probably means a bpf .o file has been changed/replaced at runtime
// and bpfloader was manually rerun (normally it should only run *once*
@ -715,7 +722,7 @@ static bool mapMatchesExpectations(const unique_fd& fd, const string& mapName,
if ((fd_type == type) &&
(fd_key_size == (int)mapDef.key_size) &&
(fd_value_size == (int)mapDef.value_size) &&
(fd_max_entries == (int)mapDef.max_entries) &&
(fd_max_entries == (int)desired_max_entries) &&
(fd_map_flags == desired_map_flags)) {
return true;
}
@ -842,6 +849,11 @@ static int createMaps(const char* elfPath, ifstream& elfFile, vector<unique_fd>&
type = BPF_MAP_TYPE_HASH;
}
unsigned int max_entries = md[i].max_entries;
if (type == BPF_MAP_TYPE_RINGBUF) {
if (max_entries < page_size) max_entries = page_size;
}
domain selinux_context = getDomainFromSelinuxContext(md[i].selinux_context);
if (specified(selinux_context)) {
if (!inDomainBitmask(selinux_context, allowedDomainBitmask)) {
@ -887,7 +899,7 @@ static int createMaps(const char* elfPath, ifstream& elfFile, vector<unique_fd>&
.map_flags = md[i].map_flags,
.key_size = md[i].key_size,
.value_size = md[i].value_size,
.max_entries = md[i].max_entries,
.max_entries = max_entries,
};
if (btfFd.has_value() && btfTypeIdMap.find(mapNames[i]) != btfTypeIdMap.end()) {
attr.btf_fd = btfFd->get();