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am b871e5d6: Merge "system_properties: do more checking of file"

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# Via Gerrit Code Review (1) and Nick Kralevich (1)
* commit 'b871e5d6b3b4a214c7f19bdfca7663f1fe49fda8':
  system_properties: do more checking of file
This commit is contained in:
Nick Kralevich 2013-01-25 14:08:26 -08:00 committed by Android Git Automerger
commit 27818d2a16
1 changed files with 18 additions and 8 deletions
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26
libc/bionic/system_properties.c
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@ -69,6 +69,7 @@ static int get_fd_from_env(void)
int __system_properties_init(void) int __system_properties_init(void)
{ {
bool fromFile = true; bool fromFile = true;
int result = -1;
if(__system_property_area__ != ((void*) &dummy_props)) { if(__system_property_area__ != ((void*) &dummy_props)) {
return 0; return 0;
@ -96,26 +97,35 @@ int __system_properties_init(void)
struct stat fd_stat; struct stat fd_stat;
if (fstat(fd, &fd_stat) < 0) { if (fstat(fd, &fd_stat) < 0) {
return -1; goto cleanup;
}
if ((fd_stat.st_uid != 0)
|| (fd_stat.st_gid != 0)
|| ((fd_stat.st_mode & (S_IWGRP | S_IWOTH)) != 0)) {
goto cleanup;
} }
prop_area *pa = mmap(0, fd_stat.st_size, PROT_READ, MAP_SHARED, fd, 0); prop_area *pa = mmap(0, fd_stat.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (fromFile) {
close(fd);
}
if (pa == MAP_FAILED) { if (pa == MAP_FAILED) {
return -1; goto cleanup;
} }
if((pa->magic != PROP_AREA_MAGIC) || (pa->version != PROP_AREA_VERSION)) { if((pa->magic != PROP_AREA_MAGIC) || (pa->version != PROP_AREA_VERSION)) {
munmap(pa, fd_stat.st_size); munmap(pa, fd_stat.st_size);
return -1; goto cleanup;
} }
__system_property_area__ = pa; __system_property_area__ = pa;
return 0; result = 0;
cleanup:
if (fromFile) {
close(fd);
}
return result;
} }
const prop_info *__system_property_find_nth(unsigned n) const prop_info *__system_property_find_nth(unsigned n)