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apache2.34444
apache2-CVE-2022-30522.patch
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File apache2-CVE-2022-30522.patch of Package apache2.34444
From 65b8fb947b144556c7ad1cf7ddc3941010ad77ba Mon Sep 17 00:00:00 2001 From: Eric Covener <covener@apache.org> Date: Wed, 1 Jun 2022 12:40:09 +0000 Subject: [PATCH] limit mod_sed memory use git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1901506 13f79535-47bb-0310-9956-ffa450edef68 --- docs/log-message-tags/next-number | 2 +- modules/filters/mod_sed.c | 5 +- modules/filters/sed1.c | 158 +++++++++++++++++++++--------- 3 files changed, 119 insertions(+), 46 deletions(-) Index: httpd-2.4.51/modules/filters/mod_sed.c =================================================================== --- httpd-2.4.51.orig/modules/filters/mod_sed.c +++ httpd-2.4.51/modules/filters/mod_sed.c @@ -362,6 +362,7 @@ static apr_status_t sed_response_filter( apr_bucket *b1 = APR_BUCKET_NEXT(b); status = sed_eval_buffer(&ctx->eval, buf, bytes, ctx); if (status != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, f->r, APLOGNO(10394) "error evaluating sed on output"); clear_ctxpool(ctx); return status; } @@ -475,8 +476,10 @@ static apr_status_t sed_request_filter(a if (apr_bucket_read(b, &buf, &bytes, APR_BLOCK_READ) == APR_SUCCESS) { status = sed_eval_buffer(&ctx->eval, buf, bytes, ctx); - if (status != APR_SUCCESS) + if (status != APR_SUCCESS) { + ap_log_rerror(APLOG_MARK, APLOG_ERR, status, f->r, APLOGNO(10395) "error evaluating sed on input"); return status; + } flush_output_buffer(ctx); } } Index: httpd-2.4.51/modules/filters/sed1.c =================================================================== --- httpd-2.4.51.orig/modules/filters/sed1.c +++ httpd-2.4.51/modules/filters/sed1.c @@ -87,18 +87,20 @@ static void eval_errf(sed_eval_t *eval, } #define INIT_BUF_SIZE 1024 +#define MAX_BUF_SIZE 1024*8192 /* * grow_buffer */ -static void grow_buffer(apr_pool_t *pool, char **buffer, +static apr_status_t grow_buffer(apr_pool_t *pool, char **buffer, char **spend, apr_size_t *cursize, apr_size_t newsize) { char* newbuffer = NULL; apr_size_t spendsize = 0; - if (*cursize >= newsize) - return; + if (*cursize >= newsize) { + return APR_SUCCESS; + } /* Avoid number of times realloc is called. It could cause huge memory * requirement if line size is huge e.g 2 MB */ if (newsize < *cursize * 2) { @@ -107,6 +109,9 @@ static void grow_buffer(apr_pool_t *pool /* Align it to 4 KB boundary */ newsize = (newsize + ((1 << 12) - 1)) & ~((1 << 12) - 1); + if (newsize > MAX_BUF_SIZE) { + return APR_ENOMEM; + } newbuffer = apr_pcalloc(pool, newsize); if (*spend && *buffer && (*cursize > 0)) { spendsize = *spend - *buffer; @@ -119,63 +124,77 @@ static void grow_buffer(apr_pool_t *pool if (spend != buffer) { *spend = *buffer + spendsize; } + return APR_SUCCESS; } /* * grow_line_buffer */ -static void grow_line_buffer(sed_eval_t *eval, apr_size_t newsize) +static apr_status_t grow_line_buffer(sed_eval_t *eval, apr_size_t newsize) { - grow_buffer(eval->pool, &eval->linebuf, &eval->lspend, + return grow_buffer(eval->pool, &eval->linebuf, &eval->lspend, &eval->lsize, newsize); } /* * grow_hold_buffer */ -static void grow_hold_buffer(sed_eval_t *eval, apr_size_t newsize) +static apr_status_t grow_hold_buffer(sed_eval_t *eval, apr_size_t newsize) { - grow_buffer(eval->pool, &eval->holdbuf, &eval->hspend, + return grow_buffer(eval->pool, &eval->holdbuf, &eval->hspend, &eval->hsize, newsize); } /* * grow_gen_buffer */ -static void grow_gen_buffer(sed_eval_t *eval, apr_size_t newsize, +static apr_status_t grow_gen_buffer(sed_eval_t *eval, apr_size_t newsize, char **gspend) { + apr_status_t rc = 0; if (gspend == NULL) { gspend = &eval->genbuf; } - grow_buffer(eval->pool, &eval->genbuf, gspend, - &eval->gsize, newsize); - eval->lcomend = &eval->genbuf[71]; + rc = grow_buffer(eval->pool, &eval->genbuf, gspend, + &eval->gsize, newsize); + if (rc == APR_SUCCESS) { + eval->lcomend = &eval->genbuf[71]; + } + return rc; } /* * appendmem_to_linebuf */ -static void appendmem_to_linebuf(sed_eval_t *eval, const char* sz, apr_size_t len) +static apr_status_t appendmem_to_linebuf(sed_eval_t *eval, const char* sz, apr_size_t len) { + apr_status_t rc = 0; apr_size_t reqsize = (eval->lspend - eval->linebuf) + len; if (eval->lsize < reqsize) { - grow_line_buffer(eval, reqsize); + rc = grow_line_buffer(eval, reqsize); + if (rc != APR_SUCCESS) { + return rc; + } } memcpy(eval->lspend, sz, len); eval->lspend += len; + return APR_SUCCESS; } /* * append_to_linebuf */ -static void append_to_linebuf(sed_eval_t *eval, const char* sz, +static apr_status_t append_to_linebuf(sed_eval_t *eval, const char* sz, step_vars_storage *step_vars) { apr_size_t len = strlen(sz); char *old_linebuf = eval->linebuf; + apr_status_t rc = 0; /* Copy string including null character */ - appendmem_to_linebuf(eval, sz, len + 1); + rc = appendmem_to_linebuf(eval, sz, len + 1); + if (rc != APR_SUCCESS) { + return rc; + } --eval->lspend; /* lspend will now point to NULL character */ /* Sync step_vars after a possible linebuf expansion */ if (step_vars && old_linebuf != eval->linebuf) { @@ -189,68 +208,84 @@ static void append_to_linebuf(sed_eval_t step_vars->locs = step_vars->locs - old_linebuf + eval->linebuf; } } + return APR_SUCCESS; } /* * copy_to_linebuf */ -static void copy_to_linebuf(sed_eval_t *eval, const char* sz, +static apr_status_t copy_to_linebuf(sed_eval_t *eval, const char* sz, step_vars_storage *step_vars) { eval->lspend = eval->linebuf; - append_to_linebuf(eval, sz, step_vars); + return append_to_linebuf(eval, sz, step_vars); } /* * append_to_holdbuf */ -static void append_to_holdbuf(sed_eval_t *eval, const char* sz) +static apr_status_t append_to_holdbuf(sed_eval_t *eval, const char* sz) { apr_size_t len = strlen(sz); apr_size_t reqsize = (eval->hspend - eval->holdbuf) + len + 1; + apr_status_t rc = 0; if (eval->hsize <= reqsize) { - grow_hold_buffer(eval, reqsize); + rc = grow_hold_buffer(eval, reqsize); + if (rc != APR_SUCCESS) { + return rc; + } } memcpy(eval->hspend, sz, len + 1); /* hspend will now point to NULL character */ eval->hspend += len; + return APR_SUCCESS; } /* * copy_to_holdbuf */ -static void copy_to_holdbuf(sed_eval_t *eval, const char* sz) +static apr_status_t copy_to_holdbuf(sed_eval_t *eval, const char* sz) { eval->hspend = eval->holdbuf; - append_to_holdbuf(eval, sz); + return append_to_holdbuf(eval, sz); } /* * append_to_genbuf */ -static void append_to_genbuf(sed_eval_t *eval, const char* sz, char **gspend) +static apr_status_t append_to_genbuf(sed_eval_t *eval, const char* sz, char **gspend) { apr_size_t len = strlen(sz); apr_size_t reqsize = (*gspend - eval->genbuf) + len + 1; + apr_status_t rc = 0; if (eval->gsize < reqsize) { - grow_gen_buffer(eval, reqsize, gspend); + rc = grow_gen_buffer(eval, reqsize, gspend); + if (rc != APR_SUCCESS) { + return rc; + } } memcpy(*gspend, sz, len + 1); /* *gspend will now point to NULL character */ *gspend += len; + return APR_SUCCESS; } /* * copy_to_genbuf */ -static void copy_to_genbuf(sed_eval_t *eval, const char* sz) +static apr_status_t copy_to_genbuf(sed_eval_t *eval, const char* sz) { apr_size_t len = strlen(sz); apr_size_t reqsize = len + 1; + apr_status_t rc = APR_SUCCESS;; if (eval->gsize < reqsize) { - grow_gen_buffer(eval, reqsize, NULL); + rc = grow_gen_buffer(eval, reqsize, NULL); + if (rc != APR_SUCCESS) { + return rc; + } } memcpy(eval->genbuf, sz, len + 1); + return rc; } /* @@ -397,6 +432,7 @@ apr_status_t sed_eval_buffer(sed_eval_t } while (bufsz) { + apr_status_t rc = 0; char *n; apr_size_t llen; @@ -411,7 +447,10 @@ apr_status_t sed_eval_buffer(sed_eval_t break; } - appendmem_to_linebuf(eval, buf, llen + 1); + rc = appendmem_to_linebuf(eval, buf, llen + 1); + if (rc != APR_SUCCESS) { + return rc; + } --eval->lspend; /* replace new line character with NULL */ *eval->lspend = '\0'; @@ -426,7 +465,10 @@ apr_status_t sed_eval_buffer(sed_eval_t /* Save the leftovers for later */ if (bufsz) { - appendmem_to_linebuf(eval, buf, bufsz); + apr_status_t rc = appendmem_to_linebuf(eval, buf, bufsz); + if (rc != APR_SUCCESS) { + return rc; + } } return APR_SUCCESS; @@ -448,6 +490,7 @@ apr_status_t sed_finalize_eval(sed_eval_ /* Process leftovers */ if (eval->lspend > eval->linebuf) { apr_status_t rv; + apr_status_t rc = 0; if (eval->lreadyflag) { eval->lreadyflag = 0; @@ -457,7 +500,10 @@ apr_status_t sed_finalize_eval(sed_eval_ * buffer is not a newline. */ /* Assure space for NULL */ - append_to_linebuf(eval, "", NULL); + rc = append_to_linebuf(eval, "", NULL); + if (rc != APR_SUCCESS) { + return rc; + } } *eval->lspend = '\0'; @@ -655,11 +701,15 @@ static apr_status_t dosub(sed_eval_t *ev sp = eval->genbuf; rp = rhsbuf; sp = place(eval, sp, lp, step_vars->loc1); + if (sp == NULL) { + return APR_EGENERAL; + } while ((c = *rp++) != 0) { if (c == '&') { sp = place(eval, sp, step_vars->loc1, step_vars->loc2); - if (sp == NULL) + if (sp == NULL) { return APR_EGENERAL; + } } else if (c == '\\') { c = *rp++; @@ -675,13 +725,19 @@ static apr_status_t dosub(sed_eval_t *ev *sp++ = c; if (sp >= eval->genbuf + eval->gsize) { /* expand genbuf and set the sp appropriately */ - grow_gen_buffer(eval, eval->gsize + 1024, &sp); + rv = grow_gen_buffer(eval, eval->gsize + 1024, &sp); + if (rv != APR_SUCCESS) { + return rv; + } } } lp = step_vars->loc2; step_vars->loc2 = sp - eval->genbuf + eval->linebuf; - append_to_genbuf(eval, lp, &sp); - copy_to_linebuf(eval, eval->genbuf, step_vars); + rv = append_to_genbuf(eval, lp, &sp); + if (rv != APR_SUCCESS) { + return rv; + } + rv = copy_to_linebuf(eval, eval->genbuf, step_vars); return rv; } @@ -695,7 +751,10 @@ static char *place(sed_eval_t *eval, cha apr_size_t reqsize = (sp - eval->genbuf) + n + 1; if (eval->gsize < reqsize) { - grow_gen_buffer(eval, reqsize, &sp); + apr_status_t rc = grow_gen_buffer(eval, reqsize, &sp); + if (rc != APR_SUCCESS) { + return NULL; + } } memcpy(sp, al1, n); return sp + n; @@ -750,7 +809,8 @@ static apr_status_t command(sed_eval_t * } p1++; - copy_to_linebuf(eval, p1, step_vars); + rv = copy_to_linebuf(eval, p1, step_vars); + if (rv != APR_SUCCESS) return rv; eval->jflag++; break; @@ -760,21 +820,27 @@ static apr_status_t command(sed_eval_t * break; case GCOM: - copy_to_linebuf(eval, eval->holdbuf, step_vars); + rv = copy_to_linebuf(eval, eval->holdbuf, step_vars); + if (rv != APR_SUCCESS) return rv; break; case CGCOM: - append_to_linebuf(eval, "\n", step_vars); - append_to_linebuf(eval, eval->holdbuf, step_vars); + rv = append_to_linebuf(eval, "\n", step_vars); + if (rv != APR_SUCCESS) return rv; + rv = append_to_linebuf(eval, eval->holdbuf, step_vars); + if (rv != APR_SUCCESS) return rv; break; case HCOM: - copy_to_holdbuf(eval, eval->linebuf); + rv = copy_to_holdbuf(eval, eval->linebuf); + if (rv != APR_SUCCESS) return rv; break; case CHCOM: - append_to_holdbuf(eval, "\n"); - append_to_holdbuf(eval, eval->linebuf); + rv = append_to_holdbuf(eval, "\n"); + if (rv != APR_SUCCESS) return rv; + rv = append_to_holdbuf(eval, eval->linebuf); + if (rv != APR_SUCCESS) return rv; break; case ICOM: @@ -896,7 +962,8 @@ static apr_status_t command(sed_eval_t * if (rv != APR_SUCCESS) return rv; } - append_to_linebuf(eval, "\n", step_vars); + rv = append_to_linebuf(eval, "\n", step_vars); + if (rv != APR_SUCCESS) return rv; eval->pending = ipc->next; break; @@ -970,9 +1037,12 @@ static apr_status_t command(sed_eval_t * break; case XCOM: - copy_to_genbuf(eval, eval->linebuf); - copy_to_linebuf(eval, eval->holdbuf, step_vars); - copy_to_holdbuf(eval, eval->genbuf); + rv = copy_to_genbuf(eval, eval->linebuf); + if (rv != APR_SUCCESS) return rv; + rv = copy_to_linebuf(eval, eval->holdbuf, step_vars); + if (rv != APR_SUCCESS) return rv; + rv = copy_to_holdbuf(eval, eval->genbuf); + if (rv != APR_SUCCESS) return rv; break; case YCOM:
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