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Add sudo_mmap_{alloc,allocarrary,strdup,free} functions.

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These allocate memory via mmap anonymous regions and store the mapped
size immediately before the returned pointer as an unsigned long.
They are intended to be used in cases where malloc(3) and free(3)
are unsuitable due to concerns about corrupting global state in
multi-threaded programs or signal handlers.
This commit is contained in:
Todd C. Miller
2022-07-25 15:08:11 -06:00
parent 15fd62f0d5
commit fccf3c9c56
5 changed files with 166 additions and 4 deletions
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10
include/sudo_util.h
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@@ -248,6 +248,16 @@ sudo_dso_public const char *sudo_logpri2str_v1(int num);
sudo_dso_public bool sudo_mkdir_parents_v1(const char *path, uid_t uid, gid_t gid, mode_t mode, bool quiet);
#define sudo_mkdir_parents(_a, _b, _c, _d, _e) sudo_mkdir_parents_v1((_a), (_b), (_c), (_d), (_e))
/* mmap_alloc.c */
sudo_dso_public void *sudo_mmap_alloc_v1(size_t size);
#define sudo_mmap_alloc(_a) sudo_mmap_alloc_v1(_a)
sudo_dso_public void *sudo_mmap_allocarray_v1(size_t count, size_t size);
#define sudo_mmap_allocarray(_a, _b) sudo_mmap_allocarray_v1((_a), (_b))
sudo_dso_public void sudo_mmap_free_v1(void *ptr);
#define sudo_mmap_free(_a) sudo_mmap_free_v1(_a)
sudo_dso_public char *sudo_mmap_strdup_v1(const char *str);
#define sudo_mmap_strdup(_a) sudo_mmap_strdup_v1(_a)
/* parseln.c */
sudo_dso_public ssize_t sudo_parseln_v1(char **buf, size_t *bufsize, unsigned int *lineno, FILE *fp);
sudo_dso_public ssize_t sudo_parseln_v2(char **buf, size_t *bufsize, unsigned int *lineno, FILE *fp, int flags);