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0005-bump-recursion-to-15-and-allow-it-to-be-se...
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File 0005-bump-recursion-to-15-and-allow-it-to-be-set-from-the.patch of Package file
From 90018fe22ff8b74a22fcd142225b0a00f3f12677 Mon Sep 17 00:00:00 2001 From: Christos Zoulas <christos@zoulas.com> Date: Thu, 27 Nov 2014 15:40:36 +0000 Subject: [PATCH] bump recursion to 15, and allow it to be set from the command line. --- src/apprentice.c | 3 ++- src/file.c | 19 +++++++++++++++++-- src/file.h | 4 +++- src/file_opts.h | 1 + src/magic.c | 28 +++++++++++++++++++++++++++- src/magic.h.in | 6 +++++- src/softmagic.c | 19 +++++++++---------- 7 files changed, 64 insertions(+), 16 deletions(-) diff --git src/apprentice.c src/apprentice.c index 2052c78..3d6cb51 100644 --- src/apprentice.c +++ src/apprentice.c @@ -524,6 +524,7 @@ file_ms_alloc(int flags) ms->mlist[i] = NULL; ms->file = "unknown"; ms->line = 0; + ms->max_recursion = FILE_MAX_RECURSION; return ms; free: free(ms); diff --git src/file.c src/file.c index b6c2c38..ac85f69 100644 --- src/file.c +++ src/file.c @@ -98,7 +98,7 @@ private const struct option long_options[] = { #undef OPT_LONGONLY {0, 0, NULL, 0} }; -#define OPTSTRING "bcCde:Ef:F:hiklLm:nNprsvz0" +#define OPTSTRING "bcCde:Ef:F:hiklLm:nNprR:svz0" private const struct { const char *name; @@ -137,6 +137,7 @@ main(int argc, char *argv[]) size_t i; int action = 0, didsomefiles = 0, errflg = 0; int flags = 0, e = 0; + size_t max_recursion = 0; struct magic_set *magic = NULL; int longindex; const char *magicfile = NULL; /* where the magic is */ @@ -245,6 +246,9 @@ main(int argc, char *argv[]) case 'r': flags |= MAGIC_RAW; break; + case 'R': + max_recursion = atoi(optarg); + break; case 's': flags |= MAGIC_DEVICES; break; @@ -297,6 +301,8 @@ main(int argc, char *argv[]) strerror(errno)); return 1; } + + switch(action) { case FILE_CHECK: c = magic_check(magic, magicfile); @@ -320,6 +326,15 @@ main(int argc, char *argv[]) if (magic == NULL) if ((magic = load(magicfile, flags)) == NULL) return 1; + if (max_recursion) { + if (magic_setparam(magic, MAGIC_PARAM_MAX_RECURSION, + &max_recursion) == -1) { + (void)fprintf(stderr, + "%s: Can't set recurision %s\n", progname, + strerror(errno)); + return 1; + } + } break; } diff --git src/file.h src/file.h index fa0f616..52a0cb8 100644 --- src/file.h +++ src/file.h @@ -401,6 +401,8 @@ struct magic_set { /* FIXME: Make the string dynamically allocated so that e.g. strings matched in files can be longer than MAXstring */ union VALUETYPE ms_value; /* either number or string */ + size_t max_recursion; +#define FILE_MAX_RECURSION 15 }; /* Type for Unicode characters */ diff --git src/file_opts.h src/file_opts.h index db34eb7..9cb1d01 100644 --- src/file_opts.h +++ src/file_opts.h @@ -44,6 +44,7 @@ OPT('0', "print0", 0, " terminate filenames with ASCII NUL\n") OPT('p', "preserve-date", 0, " preserve access times on files\n") #endif OPT('r', "raw", 0, " don't translate unprintable chars to \\ooo\n") +OPT('R', "recursion", 0, " set maximum recursion level\n") OPT('s', "special-files", 0, " treat special (block/char devices) files as\n" " ordinary ones\n") OPT('C', "compile", 0, " compile file specified by -m\n") diff --git src/magic.c src/magic.c index b2b87c9..e561796 100644 --- src/magic.c +++ src/magic.c @@ -536,3 +536,29 @@ magic_version(void) { return MAGIC_VERSION; } + +public int +magic_setparam(struct magic_set *ms, int param, const void *val) +{ + switch (param) { + case MAGIC_PARAM_MAX_RECURSION: + ms->max_recursion = *(const size_t *)val; + return 0; + default: + errno = EINVAL; + return -1; + } +} + +public int +magic_getparam(struct magic_set *ms, int param, void *val) +{ + switch (param) { + case MAGIC_PARAM_MAX_RECURSION: + *(size_t *)val = ms->max_recursion; + return 0; + default: + errno = EINVAL; + return -1; + } +} diff --git src/magic.h.in src/magic.h.in index 4a35705..9bf7d29 100644 --- src/magic.h.in +++ src/magic.h.in @@ -101,6 +101,10 @@ int magic_check(magic_t, const char *); int magic_list(magic_t, const char *); int magic_errno(magic_t); +#define MAGIC_PARAM_MAX_RECURSION 0 +int magic_setparam(magic_t, int, const void *); +int magic_getparam(magic_t, int, void *); + #ifdef __cplusplus }; #endif diff --git src/softmagic.c src/softmagic.c index 15dfce5..5fa2810 100644 --- src/softmagic.c +++ src/softmagic.c @@ -47,10 +47,10 @@ FILE_RCSID("@(#)$File: softmagic.c,v 1.1 private int match(struct magic_set *, struct magic *, uint32_t, - const unsigned char *, size_t, size_t, int, int, int, int, int *, int *, + const unsigned char *, size_t, size_t, int, int, int, size_t, int *, int *, int *); private int mget(struct magic_set *, const unsigned char *, - struct magic *, size_t, size_t, unsigned int, int, int, int, int, int *, + struct magic *, size_t, size_t, unsigned int, int, int, int, size_t, int *, int *, int *); private int magiccheck(struct magic_set *, struct magic *); private int32_t mprint(struct magic_set *, struct magic *); @@ -64,8 +64,6 @@ private void cvt_64(union VALUETYPE *, const struct magic *); #define OFFSET_OOB(n, o, i) ((n) < (o) || (i) > ((n) - (o))) -#define MAX_RECURSION_LEVEL 10 - /* * softmagic - lookup one file in parsed, in-memory copy of database * Passed the name and FILE * of one file to be typed. @@ -136,8 +134,8 @@ file_fmtcheck(struct magic_set *ms, const struct magic *m, const char *def, private int match(struct magic_set *ms, struct magic *magic, uint32_t nmagic, const unsigned char *s, size_t nbytes, size_t offset, int mode, int text, - int flip, int recursion_level, int *printed_something, int *need_separator, - int *returnval) + int flip, size_t recursion_level, int *printed_something, + int *need_separator, int *returnval) { uint32_t magindex = 0; unsigned int cont_level = 0; @@ -1217,7 +1215,7 @@ mcopy(struct magic_set *ms, union VALUETYPE *p, int type, int indir, private int mget(struct magic_set *ms, const unsigned char *s, struct magic *m, size_t nbytes, size_t o, unsigned int cont_level, int mode, int text, - int flip, int recursion_level, int *printed_something, + int flip, size_t recursion_level, int *printed_something, int *need_separator, int *returnval) { uint32_t offset = ms->offset; @@ -1228,8 +1226,9 @@ mget(struct magic_set *ms, const unsigned char *s, struct magic *m, union VALUETYPE *p = &ms->ms_value; struct mlist ml; - if (recursion_level >= MAX_RECURSION_LEVEL) { - file_error(ms, 0, "recursion nesting exceeded"); + if (recursion_level >= ms->max_recursion) { + file_error(ms, 0, "recursion nesting (%zu) exceeded", + recursion_level); return -1; } -- 1.7.9.2
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